Department of Commerce U. S. COAST AND GEODETIC SURVEY Washington TIDAL BENCH MARKS STATE OF TEXAS T - 17 (Revised) December, 1942 «feMOTE STORAGE REt/:CTZ ST071AGE TIDAL BENCH MARKS, STATE OF TEXAS INDEX Page Anahuac =• Round Point, Galveston Bay . o o c . e = o o c . o c o o o = o o 15 AirCllJ.S8. & r^G. 3 *.-• ^ X\00,X XS IS. DSiy OOOOOCCCOOOOGOOOCOOOOOOOOOPOOO OX Brazos Santiago (Padre Island) » o o , o o o o o <> o o c o o o o o o c o o c o o 37 Camp Hulenj West of Palaeios, Trespalacios Bay ocococoo. 26 Carancahua Reef* West Bay,, Galveston Bay o o o o o o o » « o o o <^ o a 21 Causeway, East end of West Bay^, Galveston Harbor o o c c o o o 10 Cedar Lake No^ 4., (West End)j Matagorda County oooooccoo 24 Christinas Point ^ Oyster Bay o o o o o o o o o c o o o o o c o « c o »» o ,■,..<> c ^ 22 Clear Lake ^ Harris County Park ^ o o o c= <> o o » o o « o <..,<> o <> o o o . c c 13 Corpus Chrlsti oo ooooooooooooooooooooo eoooooo East Jettys Freeport Harbor Entrance c o o o o c <, o o « c o o c o o o o « 23 Edwards Pointy, Galveatcn Bay o o c o o o o o o o ^ o -^ <> o o = o . o o . o . o = =. IE El Campo Club , Carancahua Bay 00^ = 00000000. o»<,ooooooooco 26 LJ& X TT© SwOXl 000Ca0O0O00C0OC-00 0QC»O0&0CC00O000C0vy000000O00O ' Galveston Bay Entrance (South Jetty Lighthouse) ccoo,coo 5 Gilchristi East Bay^ Bolivar Peninsula o o = o » c o o o c c _ : . , 4 Half Moon Reef Lighthouse , Matagorda Bay o o o o o o o o . o c o o o 25 Harbor City^ Corpus Christi Bay o >. <, o u . o c .. - . o o o o o o o o o 34 Houstorij Turning Basing Houston Ship Channel 000 c, 00. 000 20 Lynehburgj San Jacinto State Parks Houston Ship Channel o 17 Manchester^ Houston Ship Channel 0000.00000000000=000000 19 Morgan Pointy Galveston Bay o o o o o o o o o o o o o o o o o o <- c c o o o » c o 14 Moses Lake» Galveston Bay c o o o o o o o o c o o o » c , » . c » o o .■ o <■ o o o 11 Mustang Island, Corpus Christi Bay 00 o o o o o c o o o o o o c o o o o 00 36 Offats Bayou, Vicinity of Galveston o o o o = . o o o c » c o o o o o ^ 9 II TIDAL BENCH MARKS, STATE OF TEXAS INDEX Page Padre Island, Brazos Santiago <> <. » » « . o o » o . . « o . . . c o . . . = o . o 37 Pasadena, Houston Shio Channel . c c o o c . c o . . o o o . o c « <> » . . o c o 18 Point Isabel, Laguna Madre o o » o <> o o . . « » >. » . o <> » c « . o <> . c c » ., „ » 38 Port Aransas (Uu So Engineer Wharf), Aransas Pass o^oooo 29 Port Bay, Copano Bay o c » o ^ o o . » » o » . . » < . . . o o c . c » . . o « 33 Port Boliver, Boliver Peninsula, Galveston Bay . c . . . o c o . 6 Port Lavaca and Lavaca Causeway, JjP.vp.ca Bajr ccc.cicooo.o 28 Port O'Connor, Matagorda Bay o <> c o » o « o . o c c » . . « <, . . c . <> . o o . <, 24 KocKOoru, Aransas nay oooooooo«oot»«cc»o«oc*«oc*eeoocioeo Oc Round Point - Anahuac o^...co.o.oo.coo.coooc.oo.oo,rc.oo 15 Sabine Pass (Uo So Coast Guard Station) „ -> „ „ o « t » o o 3 San Luis Pas?;, Vest Bay, Galveston Bay o o o « . . o « . . . . o o . . . 21 Se^idrif t, San Antonio Bay „ e o .... c 0...0 «.<>.<,. o ».. <> 33 Shell Petroleum ConiTDeny, Buffalo Bayou, llOXlS uOtl Oillp L/llSLnnSJ. ooocoeo o«ooo*ooooooococ 00000 XO Turning Basin, Houston, Houston Ship Channel ooo..cco.oo 20 TIDAL BENCH MARKS, STATE OF TEXAS General Statement The descriptions and elevations of tidal bench marks in this pamphlet have been revised to date and supersede those given m T-17, "Tidal Bench MarkSr State of Texas" ^ issued In December 1938. The datum in general use for hydrographi<^ work along the Atlantic coast of the United States is mean low water^, which is the average height of all low waters in any locality over a considerable period of time,. Unless the series of observations covers many years j, corrections are applied to eliminate known variations and reduce the results to a mean value. In general, the elevation of each benoh mark in this publication is referred directly to the datum of mean low water. However^ in certain localities where the range of tide is less than half a foot, a modified low^^water datuiTi is usedo At stations along the Houston Ship Channel from Lynchburg to Turning Basin at Houston ^ the elevations are referred to the mean low water datum of the United States Engineers, which is the datum used as the plane of reference for soundings in this area. At each station the approximate latitude and longitude is given for the point where the tide observations were made- The year each bench mark was established, when knownj, is given in parentheses following the number of the bench markc For each station, following the descriptions ^ a state- ment as to the length and date of the tidal series used is giveno This is followed by a table giving the elevations of the following datums, all referred to the datum of mean low water? mean high water j, half tide level, and where connection has been made, Sea = level Datum of 1929c. Mean high water is the average height of all high waters over a Gon=- siderable period of timCo Half tide level, also called mean tide level, is a plane midway between mean high water and mean low watero On the open coast this plane approxi = mates the mean sea level o The Sea=level Datum of 1929 is the datum that has been adopted for the precise level net of the country and is based on the mean sea level at certain selected tide stations o Mean sea level is the average height of the surface of the sea for all stages of the tide as observed on the open coast and is usually determined from hourly height readings over a number of years u TIDAL BENCH MARKS, STATE CF TEXAS General Statement (cont'do) At Galveston the highest and lowest tides observed to date are given^ The hif^hest and lowest tides observed each month have been recorded for the Galveston tide station from At)ril 1908 to the present time and are on file in this officec This publication lists the bench mnrks used m connection with tide observations in the various localities. Some of these bench marks have also been connected with the control-leveling net of the United States^, Information concerning other bench marks in Texas, connected with the level net but not connected with a local tidal series, may be obtained by i .r'lest from the Director,. Uo S. Coast and Geodetic Survey, Washington, Do C<. Although a bench mark may anpear to be quite permanent in character, the elevation may have changed, due to settling or from other causes^ Engineers are„ therefore, cautioned to connect with tv/o or more bench marks whenever riossibleo It will be appreciated if anyone recovering marks that are inadequately described, or appear to have changed elevation, will reoort the same to the Director, Uu S^ Coast and Geodetic Survey, ""ashin^ton. Do Co Such a renort will not only be a service to this Bureau but to all engineers and surveyors who may have occasion to do leveling in the locality in the future* TIDAL BENCH IJiAWS, STATE OF TEXAS Sabine Pass (United States Coast Guard Station) latg 29''42'. 4; Long?. ^ ?''51'o2 BENCH MARK 2 (1923) is a standarc disk, stamped "2", located about 3 feet from the last telephone pole carrying the wire to the Coast Guard Stationc It is about 148 feet from, the high water lineo EleTation: 4.05 feet above mean low water o BENCH MARK 3 (lS23) is a sr nijard disk, stamped "3", located under the house of the officer^in-ch-^rge of the Coast Guard Station. The bench mark is about in range with the east side supports of the house and about 5 feet south of the northeast corner. The top of the bench mark is about 8 inches above the existing (1937) ground level. It is about 16 feet from the high water line. Elevations 2o98 feet above mean lew water. BENCH MARK 4 (1923) is the upper side of nut holding the lower end of eyebar on the north side of the northeast corner of the Coast Guard Station,, Elevation; 4o57 feet above mean low water o BENCH MARK 5, established by the United States Engineers, is a stan-= dard United States Engineer Department disk set in a 3-inch pipe which is embedded in a concrete blocko The top of the bench m,ari< is about 2 inches above the existing (1937) ground levels It is located at the end of the road leading to the dock and the United States Coast Guard Station, about 50 feet northwest of the northeast corner of the house of officer^- in-charge of the station. The bench mark is about 35 feet west of the inshore end of dock and about on range with gasoline pxomp and the Rear Rang© Beacon, and about 35 feet northwest of the gasoline pumpo Eleva- tions 3,81 feet above mean low water c The mean low water datum at Sabine Pass is based on 10 high waters and 10 low waters, January 6^=129 19215 j observed at Sabine Lighthouse, reduced to mean valueso The elevations of other tide planes referred to this datum are as follows! Mean high water o o o o ^ Half tide level coooo Mean low water datum TIDAL BENCH MARKS, STATE OF TEXAS Gilchrist, East Bay, Bolivar Peninsula Latg 29'31'o 1; Longg 94 '30', 4 BENCH MARK 1 (1933) is a standard disk, stamped "1 1933", set in concrete and projecting 6 inches above the ground^ about 180 feet east of the end of Faggard "Wharf and about 620 yards northwest from Bench Mark 2o Eleva- tions 2c.76 feet above mean low watero BENCH MARK 2 (1933) is a standard, triangulation station disk, stamped "GILCHRIST 1933", set in the top of a concrete oost, about 0.4 mile north- east along State Highway 87 from the Gulf, Colorado and Santa Fe Railway station at Gilchrist^ about 250 feet west of the Guy Moore Cafe and about 140 feet northwest of the center line of the highway. Elevations 4o34 feet above mean low water. BENCH MARK 3 (1933) is reference mark Noo 1 for triangulation station GILCHRIST, stamped "RcMo 1 1933". set in the top of a concrete post, about 0o4 mile northeast along State Highway 87 from the Gulf, Colorado and Santa Fe Railway station at Gilchrist, about 300 feet west of the Guy Moore Cafe and about 60 feet north of Bench Mark 2o Elevations 4o56 feet above mean low watero BENCH MARK 4 (1933) is reference mark Noo 2 for triangulation station GILCHRIST, stamped "RoMo 2 1933", set in the top of a concrete post, about 2,000 feet west of the triangulation station (Bench Mark 2), about 200 feet west of the Gulf, Colorado and Santa Fe Railway station at Gilchrist and about 625 feet east of Bench Mark A 172c Elevation; 4o79 feet above mean low watero BENCH MARK A 172 (1936) is a standard disk, stamped "A 172 1936", set in t^e top of a concrete post, about Ool mile southwest along State Hii^hway 87 from the Gulf, Colorado and Santa Fe Railway station at Gilchrist, between the highway and the railroad, near the east end of a rock railroad fill, 36 feet northwest of the center line of the highway and about one foot southeast of the fence linec Elevations 4o30 feet above mean low waterc BENCH MARK Z 171 (1936) is a standard disk, stamped "Z 171 1936", set in the top of a concrete post, about Id miles southwest along State Highway 87 from the Gulf, Colorado and Santa Fe Railway station at Gilchrist, about 100 feet northwest of a tavern known as "Rudy's Place", 40 feet south- west of the center line of a crossroad, 36 feet northwest of the center line of the highway and about one foot southeast of a wire fence » Elevation: 6o93 feet above mean low watero TIDAL BENCH MARKS, STATE OF TEXAS Gilchrist, East Bay, Bolivar Peninsula (cont'dc) BENCH MARK Y 171 (193 6) is a standard disk, stamped "Y 171 1936", set in the top of a concrete post, about Zd miles southwest along State Highway 87 from the Gulf, Colorado and Santa Fe Rail\iiray station at Gilohristj directly southeast of the railroad milepost 25, 38 feet northwest of the center line of the highway and one foot southwest of the fence lineo Eleva- tion: 7o37 feet above mean low water o BENCH MARK CAPLEN (1933) is a standard triangulation station disk, stamped "CAPLEN 1953", set in the top of a concrete post, about 2o3 miles southwest along State Highway 87 from the Gulf, Colorado and Santa Fe Rail- way station at Gilchrist, about 165 feet southeast of the center line of the highway, about 100 feet southwest of a house and about 40 feet south- west of the fence line. Elevation: 7o93 feet above mean low water <= The mean low water datum at Gilchrist is based on one year of auto- matic tide gage records, October 1936 -=■ September 1937, reduced to mean valueso The elevations of other tide planes referred to this datum are as follows: Feet Mean high water o » o o . . . o » o c oo o Oo90 Half tide level ooooooo.oooooo 0o45 Sea-level Datum of 1929 o.oooo 0o33 Mean low water datum » o .<>.<> o <, <. OoOO Galveston Bay Entrance (South Jetty Lighthouse) Lat's 29*19'. 6; Long: 94°41'o 6 BENCH MARK 1 (1925) is a standard disk set in the top of a large granite rock, about 100 feet east of the east side of the South Jetty Lighthouse, It was reported in October 1937 that this bench mark was covered with a layer of bituminous material several inches thick, which also covered a considerable portion of the jetty. This bench mark is unstable, having changed in elevation about Oo2 foot between 1925 and 1936^ The rock upon which it is located could be shifted by severe hurricane weathero The elevation given here is based on leveling in February 1936o Elevation: 2o57 feet above mean low water. BENCH MARK 2 (1925) is a standard disk set in the top of the concrete base of the lighthouse, 8 feet north of the center pier and one foot west of another piero Elevation: 5o94 feet above mean low water o TIDAL BENCH MARKS, STATE OF TEXAS Galveston Bay Entrance, (South Jetty Lighthouse), (cont'do) BENCH MARK 3 (1925) is a standard disk, set in the top of a large granite rock on the top of the jetty^ about 80 feet west of the light- house o Elevation? 3o05 feet above mean low water o BENCH MARK USEi established by the United States Engineersp is a spike set in the northwest corner of the concrete base of the center support of the lighthouse.. "UcSoBoMo ELEVc 9o24" is painted in white numerals about the bench mark., Elevations 6o99 feet above mean low waters The mean low water datum at Galveston Bay Entrance (South Jetty Lighthouse) is based on 1 year of automatic tide gage records, October 193 6 = September 1937, reduced to mean value So The elevations of other tide planes referred to this datum are as follows? ^ Feet Mean high water . o . « o » o « <> o lo30 Sea-level Datum of 1929 oo 0o73 Half tide level o.ooooocc 0,65 Mean low water datum ooooo OoOO Port Bolivar, Bolivar Peninsula, Galveston Bay Latg 29*21'. 8i Longs 94^46'. 7 BENCH MARK 1 (1933) is a standard disk, stamped "1 1933", set in the top of a concrete post; about h mile west of Port Bolivar Lighthouse, about 185 feet north of the northeast corner of the Gulfj, Colorado and Santa Fe Railway station and about 35 feet east of the Spiling of the railway ferry slipo Elevations 7o90 feet above mean low water » BENCH MARK 2 (1933) is a standard disk, stamped "2 1933", set in the top of a concrete post, about ^ mile west of Port Bolivar Lighthouse,, about 172 feet northeast of the northeast corner of the Gulf , Colorado and Santa Fe Railway station and about 164 feet east of the piling of the railway ferry slipo Elevations 7o41 feet above mean low water o BENCH MARK 3 (1933) is a standard disk, stamped "3 1933", set in the top of a concrete posto about 295 feet northeast of Bench Mark 2, about 260 feet northeast of the northeast corner of the house of the Gulf, Colorado and Santa Fe Railway agent and about 15 feet south of an old tower. El- evations So 62 feet above mean low water <= TIDAL BENCH MARKS, STATE OF TEXAS Port Bolivar i, Bolivar Peninsulas Galveston Bay (confyi.) BENCH MARK RM "C'\ established by the Corps of Engineers, Uo S,. Army, is a Corps of Engineers standard disk,, set in the top of a concrete post about 218 feet northeast of the northeast corner of the Gulf j Colorado and Santa Fe Railway station and about 157 feet northwest of the northwest corner of the house of the railway agento Elevations 6o38 feet above mean low water o BENCH MM. Z 167 (193 6) is a standard disk, stamped "Z 167 1936", located at the ferry landing in the top of the west end of the third con- crete pier from the ferry house and about 6 feet lower than the roadway beside the bench mark., Elevation? lOoSS feet above mean low water o The mean low water datum at Port Bolivar is based on 5 months of auto- matic tide gage records^ June = October^ 1933 and 2 months of automatic tide gage recordsj April 28 =■ June 25^ 1937^ reduced to mean valuesc The elevations of other tide planes referred to this datum are as follows? Mean high water o » ., . o , ^ < Sea=level Datum of 1929 Half tide level o , o o » o ■. < Mean low water datum . o , ' Galveston Latg 29*18^0 6; Longs 94 "47 'o 5 BENCH MARK 29 (1913) is a standard disk, screwed to the end of an iron pipe 18 inches long and set in a mass of concrete, in the sidewalk near the southeast corner of the grain elevator at the foot of 20th Street, lo2 feet from the face of a wall and 27 feet north of the edge of the alley which separates the grain elevator from the flour millo A circular hole in the concrete sidewalk surrounds the bench mark (in 1940) » Elevation: 6o60 feet above mean low water o BENCH MARK 32 (1913) is a standard disk set horizontally into the granite base of a large col'umn at the left or west side of the main entrance to the Hutchings Sealy Company building at the corner of 24th and Strand (or B) Streetso Elevations 8o24 feet above mean low watero TIDAL BENCH MARKS, STATE OF TEXAS Galv eston (contMo) BENCH MARK 33 (1915) is a standard disk, stamped "J 305 1935", set in the vertical face of the granite^base course of the eight-story office portion of the Union Railroad Station, corner of 25th and Strand (or B) Streets.. The middle of the horizontal line is the bench mark, and it is 40 inches west of the southeast corner of the building and 27 inches above the sidewalko Elevations 8.88 feet above mean low water » BENCH MARK 34 (1917) is a cross surrounded by the letters "UoScBcMo", roughly cut in the top surface on the southeast corner of the southeast foundation pier of the easternmost wireless tower on 28th Street, between Strand and Market Streets. It was reported in October 1937 that the con- crete appeared to be wearing away at this cornerc Elevationj 6o61 feet above mean low water,, BENCH MARK 35j established by the United States Engineers, is a stan- dard disk bearing the legend "United States Engineer Department, Elevation 7ol5l", set flush on the 20th Street sidewalk of the Hendley Building, near Strand Street o It is set in the cement sidewalk near the northeast corner of the building. It was reported in October 1937 that the "7" of the "70 151" is not decipherable and that the disk is stamped "ol51"o El- evations 6<,36 feet above mean low waters BENCH MARK 37 (1928) is a standard disk, stamped "37 1928", set in the top of the northeast corner of the easterly of two concrete piers sup- porting the steel trestles of the grain conveyor at the foot of 20th Streeto The bench mark pier is the foundation for the fourth trestle from the grain elevator, or the third trestle from the edge of the wharf o Elevation: 6.55 feet above mean low water o BENCH MARK 38 (1928) is a standard disk, stamped "38 1928", set in the top of the northeast corner of the easterly of two concrete piers sup- porting the steel trestles of the grain conveyor at the foot of 20th Streeto The bench mark pier is the foundation for the second trestle fronr the grain elevator or the fifth trestle from the edge of the wharfo A six=inch fill of oyster shell now (in 1940) covers the piero Elevationi 7o02 feet above mean low water o BENCH MARK 39 (1928) is a standard disk, stamped "39 1928", set in the water table on the north side of the brick building occupied by the City Electrician located on 20th Street^ just south of the intersection of 20th Street and Avenue Be The disk is set about 2o5 feet from the ground and 3o3 feet from the east end of the buildingo Elevationj 10.08 feet above mean low water o TIDAL BENCH MARKS, STATE OF TEXAS Galveston (cont'd^) BENCH MARK 40 (1935) is a standard disk, stamped "40", set vertically in concrete side of building on Pier 15. The building is on the east side of 16th Street^ extended, and the bench mark is on the west side of the building, about 6 feet south of the south side of the most northerly door of the building, and approximately three feet above the groundo Elevations 9o90 feet above mean lew water o BENCH MARK 41 (1935) is a standard disk, stamped "41", set in the foundation of the northeast leg of the large water tank at the foot of 16th Streeto Elevation? 8u25 feet above mean low watero The mean low water datum at Galveston is based on 19 years of auto^ matic tide gage records, 1909=1927, inclusive. The elevations of other tide planes referred to this datum are as follows? Highest tide (September 8, 1900) Mean high water o o . . . » « • . . o c » « . o *Sea=level Datum of 1929 Half tide level o o Mean low water datum oooo o o o o Lowest tide (January 11, 1908) o • • o oooocooo o o o o o *Based on 19 years of automatic gage records, 1915"1933o Offatts Bayou, Vicinity of Galveston Lats 29''l7^2i Longs 94°51'. 4 BENCH MARK 1 (1933) is a cross cut in the top of a concrete retaining wall, 2-|- feet east of a blue stucco garage and 183 feet southwest of steps to John's Oyster Resort o It is located lo5 miles west of Galveston city limits and about Oo8 mile east of Signal Station Islando Elevations 5o5l feet above mean low watero BENCH MARK 2 (1933) is a cross cut at the west edge of concrete foun= dation for wooden stepso It is located at the rear of John's Oyster Resort along the pavement leading from Galveston to the Galveston Causeway, and Oo8 mile east of Signal Station Islands Elevations 7o62 feet above mean low watero BENCH MARK 3 (1933) is a cross cut on top of wing wall of a concrete culverto It is looated lo9 miles west of Galveston city limits at south side of highway near a Texas Highway road sign along the pavement leading from Galveston to the Galveston Causeway, about 0.4 mile from John's Oyster Resort, and about 0o4 mile east of Signal Station Islando Elevation? 7o06 feet above mean low waters 10 TIDAL BENCH MARKS. STATE OF TEXAS Offatts Bayou,, Vicinity of Ga lveston (cont'^do) BENCH MARK 4 (1933) is a cross cut in the top of the middle of the concrete foundation of the west column of the Causeway Filling Stationo It is located 2,2 miles west of Galveston city limits at the Causeway Filling Stationo Elevations 8o24 feet above mean low watero BENCH MARK 5 (1933) or Caus-way Bench Mark 3 is a standard disk, stamped "Noo 3'V located near B -xich Mark 2 (Causeway) between the south rail of the railroad tracks and the concrete fence along the north edge of the roadway^ 442 feet east of west end of fence measured along fence, about 12 feet south of the south rail of the railroad track, and 8^ feet north of north edge of fence; Elevations 14o71 feet above mean lew water. BENCH MARK 6 (1933) or Causeway Bench Mark ? is a standard disk, stamped "Noo 2", set in the top of the north concrete sea wall near the east end of Causeway Viaductc It is 46 feet northeast of the east end of the viaduct, about 38 feet north of the north rail of the nearest railroad track, about 4 feet east of angular bend of sea wall, and about 3o4 miles west of Galveston city limitsc Elevation? 14o25 feet above mean low watero The mean low water datxam at Offatts Bayou is based on 2 months of automatic tide gage records at the Causeway, December 1933 •= January 1934, reduced to mean values,, The elevations of other tide planes referred to this datum are as followss Feet Mean high water ooooocoooo Co 70 Sea-level Datiim of 1929 ooo 0o43 Half tide level o . c o o c o « c o « Oc35 Mean low water datum occo.c 0,00 Causeway, East end of West Bay, Galveston Harbor Lat; 29''l7'o8| Longi 94''53''o 2 BENCH MARK 1, established by the United States Engineers^ is a stan- dard Corps of Engineers disk^ located on the east buttress of the bascule bridge on the Galveston=Houston Causeway Viaduct i about 9 feet lower than the bridge roadway at the southeast corner of the bascule bridge, about Oo3 foot northeast of the northwest corner of the retaining wall which is a part of the buttress and is between the north face of wall and south steel truss of the bridgCc The bench mark is about 3o4 miles west of Galveston city limitSo Elevation: 7,36 feet above mean low watero 11 TIDAL BENCH MARKS, STATE OF TEXAS Causeway, East end of West Bay-j Galveston Harbor (cont'dO BENCH MARK 2 (193?> is a standard disk, stamped "Noo 2", set in top of the north concrete sea wall near the east end of Causeway Viaductj 46 feet northeast of the east end of the viaducts about 38 feet north of the north rail of the nearest railroad track, about 4 feet east of angular bend of sea wall, and about 3o4 miles west of Galveston city limits o El- evation: 14o25 feet above mean low water o BENCH MARK 3 (1933) is a standard disk, stamped "Noo 3", located near Bench Mark 2 between south rail of railroad tracks and concrete fence along north edge of roadway, 44-|- feet east of west end of fence measured along fence, 8-g- feet north of north edge of fence and about 12 feet south of south rail of railroad tracko Elevations l4o71 feet above mean low watero The mean low water datum at the Causeway is based on 2 months of automatic tide gage records, December 1933 - January 1934, reduced to mean valueso The elevations of other tide planes referred to this datum are as follows J Feet Mean high water o o o o « » » o <, o » o 70 Sea-level Datum of 1929 coo 0o43 Half tide level <, . = . c. o . . » . o 0o35 Mean low water datum oo.ccc OoOO Moses Lake, Galveston Bay Latg 29''27'o3; Longs 94''56^ 1 BENCH MARK 1 (1933) is a standard disk, stamped "Noo 1", set in a 10-inch by 10=inch by 24=inch concrete post located on the west shore of Galveston Bays 4 3/4 miles north=northwest (air line) of the city hall at Texas City, 2x miles east-southeast (air line) of San Leon railroad station, about l-^ miles southeast of the intersection of the south shore of Dickinson Bayou and the west shore of Galveston Bay, 1 mile southwest of April Fool Point, and 1 mile northwest of Miller Pointo It is also about one-half mile southeast of triangulation station FOOL 1933 and 118 feet southwest of the west shore of Galveston Bayo Triangulation station FOOL 1933 is located about 2^ miles southeast by east from San Leon rail- road station, on the west shore of Galveston Bay on a point of land at the entrance to Moses Lake, about 3/4 mile northwest of Miller Point, 1 mile southwest of April Fool Point and 246 feet from the high water line on the bay shore o Elevations So 63 feet above mean low watero ij. OF ILL LIB. 12 TIDAL BENCH MARKS, STATE OF TEXAS Moses LakCy Galveston Bay (cont'do) BENCH MARK 2 (1933) is a standard disk, stamped "Noo 2", set in a concrete post 10 inches by 10 inches by 24 inches ^ 312 feet south by west of Bench Mark 1 and about 328 feet west of the west shore of Galveston Bay. The bench mark is located about 1 mile southwest of April Fool Point, about 1 mile northwest of Miller Point ^ and about 0o56 mile southeast of triangulation station FOOL 1933 Elevations 6ol6 feet above mean low water. BEI>ICH MARK 3 (1933) is a standard disk, stamped "No, 3", set in a concrete post 10 inches by 10 inches by 24 inches^ 306 feet northwest of Bench Mark 2j about 426 feet west of Bench Mark i and about 545 feet west of the west shore of Galveston '^ayo The bench ii»rk is located about 1 mile southwest of April Fool Point and about 1 mile northwest of Miller Pointo Elevation: 7:, 06 feet above mean low water© The mean low water datum at Moses Lake is based on 4 high waters and 3 low waters^ July 10=12, 1933, reduced to mean valueso The eleva- tions of other tide planes referred to this datum are as follows: Mean high water yo-.ooooooooo Half tide level -o c >, o o <. c o = o o Sea-level Datum of 1929 ocoo Mean low water datum c.ooooo Edwards Point j Galveston Bay Lats 29'29^8, Long? 94*54 'o 8 BENCH MARK 1 (1933) is a standard triangulation station disk, stamped "EAGLE POINT 1932", set in the top of a concrete post, located on Edwards Point (known locally as Eagle Point), 16 feet south-southeast of the north= east corner of a picnic pavilion owned by Eo Mo Bigger s, and 24 feet northeast from the southeast corner of the same structure = The triangulation station is 58 feet southwest of the southwest corner of a yellow double garage also owned by Mro Bigger s, 121 feet south of bluff at bay shore and 189 feet northwest of the center of Camp Eagle water tanko Elevation? llo82 feet above mean low water o BENCH MARK 2 (19'3) is a standard reference mark for triangulation station EAGLE POINT, stamped "EAGLE POINT NO 1 1932", set in the top of a concrete posti located 85 feet south=southeast from Bench Mark 1 (the triangulation station), 24^ feet east of center line of Camp Eagle road, 82 feet southeast of the southeast corner of a picnic pavilion, 108 feet south of the southwest corner of the dd>uble garage ^ and 108 feet north- northwest of the Camp Eagle water tanko Elevation? 12,00 feet above mean low watero 13 TIDAL BENCH MARKS, STATE OF TEXAS Edwards Points, Galveston Bay (oont'do) BENCH MARK 3 (1935) is a standard reference mark for triangulation station EAGLE POINT, stamped "EAGLE POINT NO 2", set in the top of a con= Crete postj located at road intersection Co2 mile southwest of Bench Mark (triangulation station EAGLE POINT), 31 feet east of the center line of road to bay shore^ 29 feet north of the center line of road paralleling bay shore, and 42^ feet northeast of the center of the intersectiono The bench mark is 267 feet west of the southwest comer of thp summer home owned by Mrso Dismuke of Houston. Elevations llo93 feet above mean low water. The mean low water datum at Edwards Point is based on 4 months of automatic tide gage records, April - July^ 1933, reduced to mean valueso The elevations of other tide nlanes referred to this datum are as followsi Feet oooo«ooo Oc .50 0. .25 0. ,03 0. ,00 Mean high water Half tide level .ooooc.. Sea=.level Datum of 1929 Mean low water datum o . < Clear Lake, Harris County Park Latg 29°33'.8^ Longg 95°04'o0 BENCH MARK 1 (1933) is a standard disk, unstamped^, set in the top of a concrete post, located 3 miles west along State Highway 6 from Seabrookj in Harris County Park, 2o3 feet from east boundary which divides the county property from that of Dr, Lusk of Houston; and 325 feet along the east fence line from the northeast fence cornerc The bench mark is 279 feet east of the southeast corner of the park recreation paviliono Elevation: l4o28 feet above mean low water c BENCH MARK 2 (1933) is a standard disk, unstamped, set similarly to Bench Mark 1, located 272 feet from northeast fence comer of Harris County Park measured along the north fence line parallel to center line of road, 23 feet south of the center line of the road and 118 feet from a high ten= sion line which enters county oropertyo Elevations 18„65 feet above mean low water o BENCH MARK 3 (1933) is a standard disk, unstamped, set similarly to Bench Mark 1, located in Harris County Park, 75 feet west of east fence and 30 feet south of the center line of the roado Elevations 17^76 feet above mean low water o 14 TIDAL BENCH MARKS, STATE OF TEXAS Clear Lake, Harris County Park (contMo) The mean low water datum at Clear Lake* Harris County Park is based on 2 high waters and 2 low waters^ May 11-13, 1933, reduced to mean values. The elevations of other tide planes referred to this datum are as follows s Feet 0< .50 Oc ,25 0< >00 -0< ,88 Mean high water o o . <> c c c o » c o Half tide level o o ^ o c. o o c o o o Mean low water datum »oooo. Sea=level Datum of 1929 ooo Morgan Pointj GaLireston Bay Latt 29*40*0 6, Long? 94°58^. 8 BENCH MARK 1 (1931) is a standard disk, stamped "1 1931", set in the top of a concrete post, projecting 4 inches above the ground.. The bench mark is located at the north corner of the gate leading to the old care- taker's house on the United States Engineer Reservationo It is on the west bank of the channel about halfway between the windmill and the care- taker's house, 60 feet southeast of the center of the windmill and about 85 feet northwest of the northwest corner of the caretaker's houseo Note: It was reported in October 1937 that the bank on this side of the channel is gradually caving in^ The land on which the old caretaker's house was located has been dredged out in widening the channel and it is only a matter of time before this bench mark will be washed outc Elevation: 7ol6 feet above mean low water. BENCH MARK 2 (I93l) is a standard disk, stamt^ed "2 1931", set similarly to Bench Mark 1 and located at the southwest corner of the fence around the windmill on the United States Engineer Reservationo Elevation; 7o30 feet above mean low water <. BENCH MARK 3 (1931) is a standard disk, stamped "3 1931", set similarly to Bench Mark 1 and located at the northwest corner of the fence around the caretaker's house at the United States Engineer Reservationo Eleva- tion? 6.. 96 feet above mean low water o BENCH MARK PIPE (UoSoEo), established by the Uo So Engineers, is the top of a 2=inch iron pipe driven into the ground 6 inches west of the United States Engineer Reservation fence, in range with the north side of the United States Engineer Officeo Elevations 6o49 feet above mean low water. 15 TIDAL BENCH MARKS, STATE OF TEXAS Morgan Point, Galveston Bay (cont'do) BENCH MARK 14 is a United States Coast and Geodetic Survey and State Survey standard disk, stamped "No 14" ^ set in a 6=inch by 6 inch concrete monumento The bench mark is about 25 feet south of the northwest corner of the fence surrounding the caretaker's house, about 2 feet west of the fence and about 5 feet southeast of a light pole. The top of the bench mark is about 2 inches above th- existing (1937) ground level. Elevation: 7o40 feet above mean low watet o BENCH MA.RK 8o645 (UoSoEo), established by the United States Engineers, is a Corps of Engineers standard disk, stamped "8^643"^ set in the top of a l=foot square concrete posto It is located on the United States Engi= neers Reservation at Morgan Point, at the northwest corner of the reservation fence and 3 feet southeast of the corner fence posto Elevations 7c 49 feet above mean low water o The mean low water datum at Morgan Point is based on 1 year of auto= matic tide gage records, October 1936 = September 1937^ reduced to mean values o The elevations of other tide planes referred to this datum are as follows? Feet Mean high water c „ . o = <= <= o o o c Oo80 Half tide level ooocooo.ooo 0o40 Sea-level Datxm of 1929 oo. 0o21 Mean low water datum ooooco OoOO Anahuac ~ Round Point, Galveston Bay Lata 29''44^. 3| Long^ 94''42^. 4 BENCH MARK 3, established by the United States Engineers at Anahuac, is a knob in center of a bronze tablet, stamped "22o375", set in top of a concrete post, located at the ice house on the edge of bluff, 1 foot under the southeast corner of the service platform of Anahuac Ice Plant, about 50 feet northwest of T=intersection of streetso It is flush with the groundo The bronze tablet is tilted with the horizontals In 1936 the rod was held on bench mark by removing a plank of the ice house loading platfomio The bench mark is 12 inches west of the east side of the loading porch or service platform, 3o7 feet east of east face of ice plant buildings and 12o9 feet north of the southeast corner of the ice plant porcho Notes The bench mark was recovered in October 1937, at which time it was reported that the bench mark was buried under four to six inches of rubbisho Elova= tions 23o07 feet above mean low water., 16 TIDAL BENCH MARKS. STATE OF TEXAS Anahuac <=■ Round Point * Galves ton Bay (conf'd^, ) BENCH MARK 4s established by the United States Engineers at Anahuac, is a bronze tablet, stamped "23„44l"p set in the top of a concrete post located on the north property line of land owned by the Wilcox Estate (home site of the Chambers Homestead) » 132 feet east-southeast of northwest corner of the Chambers houses 25 feet south of center line of street north of Chambers house and 116 feet easl of property corner west of Chambers houseo Notes In October 1937^ it was reported that the Chambers homestead was in a dilapidated condition and that it may be torn down m the futurec Elevations 23,64 feet above mean low water. BENCH MARK 6 - P.BoMo 13 (UcSoEo), established by the United States Engineers at Anahuac and used as a standard bench mark by the Texas Rec^ lamation Department , is the bottom of a chiseled square cut in concrete step (tread) of north door of the Security State Bank building, about 5 feet south of northwest corner of the bank building and about 8 feet east of west side of concrete floor of porch in front of banko Notes In March 193 6s it was reported that the letters "U S P B M" are roughly cut into the concrete step near the hollow square ^ Elevations 25o61 feet above mean low waters BENCH MARK 1 (1933), at Round Point, is a standard disk, stamped "BM 1 1933" s set in the top of a concrete post projecting 4 inches above surface of grounds located 134 feet east from edge of bluff at bay shore, 93 feet south=by=west from southwest corner of the Clark residence, and 11 feet northwest from a cedar tree about 16 inches in diametero Round Point is 2^ miles south of AnahuaCn Elevation: 19c42 feet above mean low water.. BENCH MRK 2 (1933), at Round Point,, is a standard disk, stamped "BM 2 1933", set in a concrete post projecting 4' inches above ground o located just west of the Anahuac=Eagie road in lane leading to the Clark house, 11 feet north from the center line of road leading to house, about 175 yards east-northeast from Bench Mark 1, l-S feet sonth from fence line and 51 f^et north by east of a wello Elevation? 18.79 feet above mean low waterV BENCH MARK 2 (1933), at Round Point, is a standard disk, stamped "EM 3 1933", set in a concrete post projecting 4 inches above the ground, lo= cated just west of the Anahuac-Eagle road in lane leading to the Clark house, 8 feet north from the center line of road leading to house, 1:5 feet south from fence line and about ^ mile east=northeast from Bench Mark Ic Elevations 18o46 feet above mean low water = 17 TIDAL BENCH MARKS, STATE OF TEXAS Anahuac - Round Point j, Galveston Bay (cont'do) The mean low water datum at Anahuac = Round Point is based on 1 year of automatic tide gage records at Round Pointj October 1936 ■= September 1937i reduced to mean valueso The elevations of other tide planes referred to this datum are as follows? oocoooo* o Mean high water Half tide level ooooooc Sea-level Datum of 1929 Mean low water datum o o c Lynchburgs San Jacinto State Park, Houston Ship Channel Lato 29°45'. 3; Longs 95'''04°o 6 BENCH MARK 1 (1931) is a standard disk, stamped "Noc 1 1931", located i6-|- feet back from western edge at entrance to concrete dock in San Jacinto State Parko The berr'^ mark is on the lowest of 12 concrete steps leading from a 40-foot flagpole to dock and is set flush with tor> of stepo Eleva- tion: 7ol8 feet above United States Engineer datumo , BENCH MARK 2 (1931) is a standard disk, stamped "Noo 2 1931", located in foundation of a column of concrete blocks used to support a 40=foot flagooleo The foundation is in the form of a 5=pointed star with points 5 feet in length and 1 foot above a shell covered areao The bench mark is set in the point of star closest to Buffalo. Bayouo Elevations 16o27 feet above United States Engineer datumo BENCH MRK 3 (1931) is a standard disk, stamped "No. 3 1931", located 43 feet to the east of a shell covered road paralleling and approximately 98 feet from Buffalo Bayou^ It is located in San Jacinto State Park and is 115 feet south of a red tiled roof covered concrete buildings The bench mark is set in the foundation of a granite stone marker 2^ feet by 2 feet by 2 feet, with the following inscription on its face? "No.. 5 Sherman's Campo" The bench mark is 6 inches above the sxirrounding ground surf a ceo Elevations 15o94 feet above United States Engineer datum, Elevations are referred to the United States Engineers mean low water datum as obtained by spirit level connection with Base Line Monument No^, 525. The Unit«-d States Engineers elevation for Base Line Monument Noo 525 is 7o326 feet above this datum. 18 TIDAL BENCH MARKS, STATE OF TEXAS Shell Petroleum Company, Bvrffalo Bayou, Houston Ship Channel Lats 29*45*0 9,° Longs 95 "07'. 9 BENCH MARK 1 (1931) is a standard disk, stamped "Noo 1 1931", set in the concrete base of a steel support to a steam main extending along the docks o This concrete base is 1^ feet by 1^ feet on top and extends 20 inches above the ground. The bench mark is located near the docks of the Shell Petroleum Company on Buffalo Bayou, 62 feet from the water line of the Shell slip, at the entrance of a small dock with a fire nozzle connected to a water pipe and 3 feet west of a fire hydrant <> It is also approximately 98 feet southwesterly from the dock gateso Elevation: l5o37 feet above United States Engineer datum. BENCH MARK 2 (1931) is a standard disk, stamped "^No. 2 1931", set in the concrete base of the steel supcort to the same steam main in which Bench Mark 1 is seto This part of the steam main extends but 5 feet above the surface of the groundo The bench mark is located 115 feet northerly of Bench Mark 1 and 66 feet westerly from the dock gatesc Elevation: 15.37 feet above United States Engineer datum. BENCH MARK 3 (1931) is a standard disk, stamped "No„ 3 1931", located on the northeast corner of an 8-inch concrete wall which is 3 feet above the surrounding ground. The western half of this wall forms the foundation of 10-foot by 10-foot red brick "Separator" house. Buffalo Bayou is approxi- mately 164 feet to the north and Shell slip is approximately 131 feet to the west. Elevation; 14.21 feet above United States Engineer datum. Elevations are referred to the United States Engineers' mean low water datum a* obtained by spirit level connection with Base Line Monument Nou 695s elevation; 10.645 feet To refer the elevations of the above bench marks to the Sea-level Datum of 1929, subtract 1.57 feet from the eleva- tions above the U, S« Engineers' datum. Pasadena, Houston Ship Channel Lats 29*43'. 5; Longs 95*12'. 7 " BENCH MARK 1 (1931) is a standard disk, stamped "^No, 1 1931", set in concrete monument one foot square on top, 1^ feet square at bottom, 32 inches in the ground and extending out of ground 4 inches o The bench mark is located on the south bank of Buffalo Bayou at Pasadena Ferry. The monument is set under a wire fence on the west side of the road and 102 feet south from the south ferry landing. It is 21 feet north of a small 10-foot by 13 -foot ferry house on the edge of the road. Elevation; 13.13 feet above United States Engineer datum. 19 TIDAL BENCH MRKSv STATE OF TEXAS Pasadena, Houston Shit) Channel (cont'do) BENCH MARK 2 (1931) is a standard disk, stamped "Noo 2 1931", set in a concrete monument in the same manner as Bench Mark 1, located on the south bank of Buffalo Bayou at Pasadena Ferry^ It is under a wire fence on the east side of road, 148 feet south of the ferry landing and 46 feet east of a small ferry house at the edge of the roado Elevations 12o07 feet above United States Engineer datumo BENCH MARK 3 (1931) is a standard disk, stamped "Noo 3 1931", set in top of a 12°inch brick wall extending 4 inches above the surrounding ground, located on the south bank of Buffalo Bayou at Pasadena Ferryo The bench mark is in the northwest comer of the wall which is used as oil separating tanks of the Crown Petroleum Company and is approximately 141 feet east of the south ferry landingc Twenty feet to the east is a small 10=foot by 13-foot steel house , The bench mark is 92 feet from a bulkhead on the bayou to the northo Elevation: 16o83 feet above United States Engineer datumo Elevations are referred to the United States Engineer's mean low water datum, as obtained by spirit level connection with Base Line Monument Noo 1005o The United States Engineer ^'s elevation for Base Line Monument Noo 1005 is 9o720 feet above this datiomc To refer the elevations of the above bench marks to the Sea-level Datum of 1929, subtract lo57 feet from the elevations above the United States Engineer's datumo Manchester, Houston Ship' Channel Lats 29''43»o4| Longs 95°l5'o9 BENCH MARK 1 (1931) is a standard disk, stamT)ed "Noo 1 1931", set flush with the top of platform and one foot from the cornero This is a loading p-latform, 4 feet high, which extends along the south side of the Manchester Warehouse Wharf located on the south side of Buffalo Bayou at Manchesterc The bench mark is on the southwest corner of the warehouse wharf, and is 85 feet west of an overhead grain chute leading from the American Maid Flour Mill to the dockso Elevations I8066 feet above United States Engineer's datumo BENCH MARK 2 (1931) is a standard disk, stamped "Noo 2 1931", in the top of a concrete slab lo4 feet square at the top, lo4 feet by 2o4 feet at the base and extending 4 feet out of the groundo The bench mark is located on the south side of Buffalo Bayou at Manchester, 82 feet south from the southwest corner of City Wharf located between Manchester "Wharf and Portland Cement Company "Wharf j 18 feet southeast from a small shell road and 151 feet east from the east Portland Cement Company fence o To the south are four railroad tracks o Elevations 25o02 feet above United States Engineer's datumo 20 TIDAL BENCH MRKS, STATE OF TEXAS Manchester, Houston Ship Channel (cont'do) BENCH MARK 3 (l93l) is a standard disk, stamped "No. 3 1931", set in the top of a seven=inch wall, 3 feet north of the northeast corner of a small concrete building 16 feet by 3 6 feeto It projects 6 inches above a concrete walk which parallels the wall* The wall is on the property of the Texas Portland Cement Compi^.ny located on the south side of Buffalo Bayou at Manchester and is about S9 feet from the bayou- Elevation: 16«,S3 feet above United States Engineer's datunir. Elevations are referred to the United States Engineer's mean low -jrater datum as obtained by spirit level connection with the Houston Launch Club Bench Mark at Harrisburgj elevationt 27<,405 feetg Turning Basin, Houston, Houston Ship Channel Lat? 29 "44'. 7 ; Longs 95*17'Io BENCH MARK 1 (1931) is a standard disk, stamped "No. 1 1931", located on east side of Turning Basin at City TMiarf Noo l5o It is on the south- east corner of a 4-foot high concrete platf'orm along the east side of wharf warehouse No. 15 and is set flush with top of platform^ 5 inches from the cornerc To the east are f'^ur railroad tracks, the near one 10 feet from the loading platformc Elevations 18.33 feet above United States Engineer's datum. BENCH MARK 2 (1931) is a standard disk, stamped "Noo 2 1931", set flush with top of a 4-foot high retaining vmll which is 157 feet long on the east sideo In the center of this is a steel support for an overhead grain chute «> The wall is located on the property of the Houston Public Grain Elevator at the Turning Basin of the Houston Ship Channel. The bench mark is located 177 feet north of the northeast corner of building on Hfharf Noo l5o Elevations 19olO feet above United States Engineer's datunic BENCH MARK 3 (1931) is a standard disk, stamped "No. 3 1931", set vertically in the south wall of the Houston Public Grain Elev&tior office at the Turning Basin, one foot from the southwest corner and 2..3 feet abov-^ the surrounding ground. The office is a single=story red br:.CK: Duiidmg, approximately 39 feet square, situated approximately 165 feet west of a tall black water tanko Elevations 40. 2o feet above United States Engineer's datum 9 Elevations are referred to the United States Engineer's mean low water datum as obtained through spirit level connection with Base Line Monument Noo 1285; elevations 33.63 9 feet. To refer the elevations of the above bench marks to the Sea-level Datum of 1929, subtract 1.07 feet from th',? elevations above the Uc S.. Engineer's datum* 21 TIDAL BENCH MARKS, STATE OF TEXAS Carancahua Reef^ West Bays Galveston Bay a Latg ES^ie^Sj Longg 9r/00«o 3 BENCH MARK 3 (191^3) is triangulation station REEF, not stamped, set in the top of a conci'ete post on the east shore of West Bay, on the property of Co Co Washington, County Surveyor of Galveston County, about 52 feet south of the east shore of West Bay, about 1^,590 feet west of the west side of Washington boat channel, 148 feet northwest from the northernmost point of a large pond and 1,285 ;yards northwest by west of Mrc Washington's camp on Galveston Islando It was reported in October 1937 that the bench mark was recovered in good condition as described, but that it was covered by several inches of water., Elevation? Io05 feet above mean low watero BENCH MARK 4 (1933) is reference mark 1 for triangulation station REEF, stamped "REEF RM 1 1912 1933", set in the top of a concrete post, 50 feet No 72' Eo (mago) from Bench Mark 3, 59 feet south of the east shore of West Bay, 105 feet northwest of the northernmost point of a large pond on Galveston Island on property of d, Cu Washingtono Elevations lo35 feet above mean low watero The mean low water datum at Carancahua Reef, West Bay, is based on one year of automatic tide gage records, October 1936 = September 1937, reduced to mean values o The elevations of other tide planes referred to this datum are as follows s Feet Mean high water o o o o o o o o o o o o Oo 70 Half tide level oqoooooooooo 0o35 Sea^-level Datum of 1929 ooo„ 0o35 Mean low water datum -. o o o o o o OoOO San Luis Pass, West Bay, Galveston Bay Latg 29^05'o7j Longs gS^OS^S BENCH MARK 1 (1933) is a standard disk, stamped "Noo 1", set in the top of a concrete post on the west end of Galveston Island, about 2o7 miles southwest of San Luis Coast Guard Station and about 0.5 mile northeast of San Luis PasSo It is about 1,240 feet we st= southwest of Mro Go Vo Amotto's windmill, about 1,030 feet south=southwest of triangulation statior MOTTO, and about 203 feet southeast of the west shore line of Galveston Islando Elevations 6ol3 feet above mean low watero BENCH MARK 2 (1933) if triangulation station MOTTO, stamped "MOTTO 1933", set in the top of a concrete post located 1,030 feet north=northeast of Bench Mark 1, 1,145 feet northwest of the windmill of MTo Go Vo Amotto and 197 feet southeast of the west shore line of Galveston Islando Eleva- tions 4o88 feet above mean low watero 22 TIDAL BENCH MARKS, STATE OF TEXAS San Luis Pass, West Bay, Galveston Bay (cont'do) ' BENCH MARK 3 (1933) is standard reference mark Noo 1 for triangulation station MOTTO, set in the top of a concrete oost, about 75 feet northeast of the triangulation station. It is stamped "MOTTO 1933 NO 1" and is lo- cated at the southwest end of Galveston Island at San Luis Pass, about 2o7 miles southwest of San Luis Coast Guard Station, Elevation: 5.21 feet above mean low water » BENCH MARK 4 (1933) is standard reference mark No. 2 for triangula- tion station MOTTO, set in the top of a concrete post, about 98 feet south- east of the triangulation stationo It is stamped "MOTTO 1933 NO 2", and is located at the southwest end of Galveston Island at San Luis Pass, about 2o7 miles southwest of the San Luis Coast Guard Stationo Elevation: 6.05 feet above mean low water o The mean low water datum at San Luis Pass, T^est Bay is based on 46 high waters and 53 low waters, October 1 - November 21, 1933, reduced to mean valueso The elevations of other tide planes referred to this datum are as follows: Feet Mean high water <,» o. 0.90 Sea-level Datum of 1929 .... 0,68 Half tide level 0.45 Mean low water datum ......o 0.00 Christmas Point, Oyster Bay Latt 29*04'o5; Long; 95°10'.6 BENCH MARK 1 (1934) is a standard disk, stamped "No. 1", set in con- crete and located in Brazoria Countys on the northwest shore of Oyster Bay on Christmas Point, about 13 miles northeast of Freeport, ^ mile west of the extreme eastern end of Christmas Point, about 330 yards west of a row of salt cedars extending north and south and a short distance north of a 3-foot bluff. Elevation: 4.42 feet above mean low water. BENCH MARK 2 (1934) is a standard disk, stamped "2", set in concrete, located on Christmas Point about 550 yards west of the extreme eastern point, about 330 yards east of Bench Mark 1 and 33 feet east of an opening in a row of salt cedars extending north and south. Elevation: 4.47 feet above mean low water. 23 TIDAL BENCH MARKS, STATE OF TEXAS Christmas Pointj Oyster Bay (cont'do) BENCH MARK 3, established by the United States Engineers, is United States Engineer triangulation station HARTRICK^ marked by a 4-inch iron pipe with cat) having a ^^inch hole at its centers (no number or date)^ located on Christmas Point about Oo7 mile west of the extreme east end of pointy 0o4 mile west of a row of salt cedars extending north and souths about 165 yards south of a 3=foot bluff and about 350 yards southwest of Bench Mark lo Elevations lo32 feet above mean low water » The mean low water datum at Christmas Point, Oyster Bay is based on 25 high waters and 25 low waters^ February 9 - March I4j 1934, reduced to mean valueSo The elevations of other tide planes referred to this datum are as followss Feet Mean high water o o . o <> . „ o o o o Oo 50 Half tide level o ^ o c. c o o o o o o 0o25 Mean low water datum oooooo OoOO East Jetty, Freeport Harbor Entrance Latg 28''55'o7j Longg 95°17«o4 BENCH MARK 1 (193?) is a standard disk set in a drill hole in the concrete capping of the East Jetty wallo The bench mark is about 1 foot from the southeast end of the concrete capping wall where the jetty con= tinues toward the sea as a granite boulder wall. Elevations 7o71 feet above mean low water » BENCH MARK 2 (1937) is a standard disk set in a drill hole in the concrete capping wall and 400 feet northwest of Bench Mark 1 or the end of the concrete cappingo Elevations 7o74 feet above mean low water o BENCH MARK 3 (1937) is a standard disk set in a drill hole in the concrete capping wall of the East Jetty and 900 feet northwest from the end of the concrete cappingo Elevation; 7o75 feet above mean low watero The mean low water datum at East Jetty, Freeport Harbor Entrance is based on 2 months of automatic tide gage records, August = September 1937 reduced to mean valueso The elevations of other tide planes referred to this datum are as followss Feet Mean high water o o o » » Half tide level ooooo Mean low water datum 1< ,50 Oc >75 Oc ,00 24 TIDAL BENCH MARKS, STATE OF TEXAS Cedar Lake Noo 4, (T^^est End) Matagorda County Lati 28°49',li Long? 95 "31*. 8 BENCH MARK 1 (1936) is a standard disk set in a concrete block 400 feet west of tide gage house which was at entrance to Old Intracoastal Waterv/ay and 100 feet south of south bank of old canal« Elevation: 4.25 feet above mean low water » BENCH MRK 2 (193 6) is a standard disk set in a concrete block 1,500 feet west of tide gage house and 100 feet north of north bank of old canal o Elevation: 2ol4 feet above mean low watero BENCH MARK 3 (1937) is a standard disk set in a concrete block located approximately 1,950 feet north 22* west from tide gage house. Elevation; 2.84 feet above mean low water. The mean lew water datum at Cedar Lake Noo 4 is based on 4 months of automatic tide gage records, November 1936 - February 1937, inclusive, reduced to mean valuesc The elevations of other tide planes referred to this datum are as follows! Feet Mean high water 0. 50 Half tide level 0.25 Mean low water datum ....... 0.00 Port O'Connor, Matagorda Bay Lat; 28''27'.1; Long; 96*23'. 8 BENCH MARK 1 (1934) is a standard disk, stamped "PORT O'CONNOR No. 1", set in a concrete block on southwest corner of intersection of Park and Adams Streets, 43,1 feet southeast (magnetic) from 4-inch by 4-inch stake marking corner "S36-T5", 23 feet south of center line of Adams Street, 26 feet west of center line of Park Street, 11^ feet south-southwest (mag- netic) of 8-inch telephone pole at southwest comer of the intersection and about 200 feet from high water line. Elevation; 7.92 feet above mean low water. BENCH MARK 2 (1934) is a standard disk, stamped "PORT O'CONNOR No, 2", set in a concrete block on north corner of property belonging to Mrs. Eva Pickett, 132c 5 feet southwest of 4-inch by 4-inch stake marking corner "S36-T5", 18 feet west of concrete foiondation on northwest corner of square white building, 23 feet southeast of center line of Adams Street and about 9 feet east-southeast of 8-inch telephone pole at north corner of Pickett's property. Elevation: 7.21 feet above mean low water. 25 TIDAL BENCH MARKS, STATE OF TEXAS Port 0'' Connor, Matagorda Bay (conf'dc)) BENCH MARK 3 (1934) is a standard disk, stamped "PORT O'CONNOR Noo 3", set in a concrete blocks 207 feet north of 4-=inch by 4=inch stake marking corner "336- TS", 2o3 feet south of southeast corner post of fence belong= ing to Clarence Goldman, 26 feet west of center line of Park Street, 16 feet east (magnetic) of southea&T; corner of Clarence Goldman's house, 8 feet west (magnetic) of second telephone pole north of Adams Street on west side of Park Street o From the bench mark the northeast corner of the post office bears 197** (magnetic) o Elevations 7^66 feet above mean low water o The mean low water datum at f'ort O'Connor is based on 54 high waters and 51 low waters ^ June 6 = August 6, 1934, reduced to mean values^ The elevations of other tide planes referred to this datum are as follows^ Mean high water Half tide level Mean low water datum oo*eoooooo O O O o o Half Moon Reef Lighthouse, Matagorda Bay Latg 28*33 'o Oj Longg 96*15'o 3 BENCH MARK 1 (1934) is a cross cut in the top of a 2-inch square set screw on the southwest side of the northeast iron pile lower collar o El= evationg lo96 feet above mean low water o The mean low water datum at Half Moon Reef Lighthouse is based on 5 months of automatic tide gage records, July 1934 - January 1935, reduced to mean values. The elevations of other tide planes referred to this datum are as followss Feet Meem high water o <, . o o » o . o o « o Oo 70 Half tide level ooooooo.ocoo 0o35 Mean low water datum <> o » « o o <, OoOO 26 TIDAL BENCH MRKS, STATE OF TEXAS Camp Hulen, West of Palacios, Trescalacios Bay Lats 28'41^ 1, Long- 96''l4-. 9 BENCH MARK 1 (1934) is a standsrd disk, stamped "Camp Hulen Noo 1 1934", set in a concrete post projecting 6 inches above the ^roundc The bench mark is at the ';outh end of the Camp in a yard around a white house, 290 feet south of a road paralleling the bay shore, 58 feet east of the center line of road leading to dock, 18 feet east cf a woven wire fence, 120 feet north of the high water line and m the center of a brick-encircled flower plot. Elevations 8, 88 feet above mean low water. BENCH MARK I (1934) is a standard disk, stamped "Camp Hulen Noc. 3 19?'4", set in a concrete post projerting 0.4 foot above the ground, 123 feet north of the center of the gate at the southeast corner of the grounds, 39 feet west of the center line of the north -south paved road extending along the east side of the camp^ 4,6 feet west of a wire fence and about 219 feet northeasterly from a flagpole. Elevations 10 53 feet above mean low water o The mean low water datum at Camp Hulen is based on 9 high waters and 9 low waters, December 18?!, 1934, reduced to mean values. The elevations of other tide olanes referred to this datum are as follows i Mean high water Sea-level Datum of 1929 Half tide level o o e o o .. e Mean low vmter datum c. o occcocooo El Campo Clubj, Carancahua Bay Lats 28 "39' 2? Lonp-s 96°21«'6 BENCH MARK 1 (1934) 1974", set horizontally most camohouse, in front north of the edge of the of the east shore of the station at Palacios, pro to intersection of cross road to intersection of along road to inter secti shell road to intersect! along private road to th above mean low water o IS a standard disk, stamped "Carancahua Noo 1 in the concrete walk on the west side of the southern* of the middle steps facing the bay, about 6 feet walk leading to the bay and about 7 feet east bavo To reach from the Southern Pacific Railroad ceed 9o6 miles westerly along State Highwav Noo 35 roadj then go 1.5 miles southerly along graded road leading easterly^ then go 0o5 mile easterly on of shell roadj then 2o7 miles southerly along on of private roadj then go 0.7 mile southwesterly e site of the bench mark^ Elevation: 7u00 feet 27 TIDAL BENCH MARKS, STATE OF TEXAS El Campo Club^, Car ancahua Bay (cont'do) BENCH MASK 2 (1934) is a standard disk, stamped "Carancahua Noo 2 1934", set in a concrete post 1 foot square at the top and nrojecting Oo3 foot above the grounds The bench mark is under the west gable of the care-- taker "s house, about Oo7 foot west of the edge of the building, about 220 feet east of the shore line and about 67 feet south of the center line of a dirt road along the south edge of the campo Elevations 7<,20 feet above mean low water ^ BENCH MARK 3 = CAMPO (1934) is a standard triangulation station disk, stamped "CAMPO 1934"; set in a concrete post projecting 0c,4 foot above the ground, about 0ol5 mile north of the first club building on the grounds of the El Campo Club, about 270 feet east of a bank on the shore of the bay, about 165 feet west of the center line of a private road, 22 feet south of a section line fence, 18 feet east of RoEoAo power line and 5 feet so^jth of a 4x4='inch wooden marker posto Elevations 5o28 feet above mean low water o BENCH MARK 4 = CAMPO RoMo 1 (1934) is a standard reference mark disk, stamped "CA^ilPO NOo 1 1924", set in a concrete post projecting 0o4 foot above the ground, about 155 feet west of the center line of a private road, 87 feet south of section line fence, 28 feet east of RcEoA* power line and about 78 feet southeast of the triangulation station (Bench Mark 3)o Elevations 5o34 feet above mean low watero BENCH MARK CAMPO RoMc 2 (1934) is a standard reference mark disk, stamped "CAMPO NOo 2 1934", set in a concrete post projecting 0o4 foot above the ground, in section line fence, about 235 feet west of the center line of private road, 52 feet west of ReEoA» power line and about 67 feet northwest of the triangulation station (Bench Mark 3). Elevations 5o35 feet above mean low watero The mean low water datum at El Campo Club, Carancahua Bay, is based on 27 high waters and 29 low waters, November 14 ■= December 15, 1934, reduced to mean valueso The elevations of other tide planes referred to this datum are as followss Mean high water o o . o o . . < Half tide level .,coo.. . Sea-level Datum of 1929 Mean low water datum oo< 28 TIDAL BENCH MARKS, STATE OF TEXAS Port Lavaca and Lavaca Causeway, Lavaca Bay Latg 28°59^0j Long-. 96°55'.7 BENCH HIARK T.BoMo 1 (1934) is a standard disk, stamped "ToBcMo 1 1935", set in top of south curb on the Lavaca Bay Causeway, 110 feet southwest of the control house of the bascule span of the causeway and 129 feet south- west of the southwest corner of the bascule span Elevations 15o06 feet above mean low water o BENCH MARK 1 (1934) is a standard disk, stamped "B.Mo 1 1935", set on top of a concrete post 12 inches by 12 inches by 36 inches, located 2 miles northeast of Port Lavaca on State Highway 35, 0=2 mile southwest of the west end of the Lavaca Bay Causeways 1 foot north of the north right- of-way fence, 50o9 feet northwest of the center line of the highway, 27c, 5 feet northeast of the center line of a private road on the prooerty of Mro John Garner of Port Lavaca and 3 feet east of a 4x4-inch wooden marker posto Elevations 3o46 feet above mean low water o BENCH M.^RK 2 (1934) is a standard disk, stamoed "B.'v!c 2 1935", set similarly to Bench Mark 1, located 2 miles northeast of Port Levaca on the north side of State Highway 35, Oo2 mile southwest of the west end of the Lavaca Bay Causeway, 186^5 feet north of the center line of the highway and 8 feet west of the center line of a private road on the property of Mr, John Garner of Port Lavaca The bench mark is flush with the ground and is ^bout 3 feet south of a 4x4-inch wooden marker post Elevations 7„82 feet above mean low water ^ BENCH J.1ARK W 596 (1942) is a standard disk, stamped "Ti 596 1942", set horizontally in the north headwall of a 4x4-foot concrete culvert, 15 feet north of and about Oo5 foot below the center line of the highway » The bench mark is about Oc8 mile easterly along State Highway 35 from the post office at Port Lavaca.. Elevations 14c07 feet above mean low water^ BENCH MARK ToBcMo 3 (1934) is a chiseled cross on the northeast corner of a concrete culvert 82 feet south of Harvels Filling Stationc Elevation: 19o44 feet above mean low water o BENCH MARK TcBcMc 4 (1934) is a cross cut in the top of the Port Lavaca concrete sea wall at the south side of a shell road leading to the Smith Fish Company Vliarf, 5o4 feet northwest of the projected line of a wooden bulkhead on the north side of the boat slipo Elevations 5.51 feet above mean low water o BENCH MRK USED, established by the United States Engineers, is a standard disk set in the top of a 4-inch tile oipe filled with concrete, located 3,5 feet west of the Port Lavaca sea wall, 141 paces northwest of the center line of a shell road leading to the Smith Fish Company If^harf and 17 paces south of the projected line of the south side of the ^hell Fish CafCc Elevations 5 ..68 feet above mean low water o 29 TIDAL BENCH MARKS, STATE OF TEXAS Port Lavaca and Lavaca Causeway, La vaca Bay (cont'do) BENCH MARK A 41 (1918) is a standard disk, stamped **A 41 1918 ELEV, 23o097 FTo*'; set vertically in the south wall of the Navidad Hotel, 2 feet west of the south entrance and 4ol feet above the ground <. The hotel is 2-|- blccks east of the Texas and New Orleans Railroad station and on the same street as the stationo Elevation: 2?o24 feet above mean low water., BENCH MARK C 41 (1918) is a standard disk, stamped "C 41 1918 ELEVo 21o650 FTo'\ set in a stone slab at the courthouse, about 10 feet east of the north entrance and about 3 feet north of the easternmost pillar o Elevations 21o80 feet above mean low watero The mean low water datum at Port Lavaca and Lavaca Causeway is based on 2 months of tide observations, October 13 - December 14, 1934, obtained at the drawbridge,. Lavaca Causeway and reduced to mean values.. The eleva- tions of other tide planes referred to this datum are as follows: Feet Mean high water o o o . . . » . » . o Oo 70 Half tide level cc.o.o.c.o Oc35 Sea-level Datum of 1929 o.. Ool5 Mean low water datum ^ . . « <. . 0<,00 Port Aransas (Ui, So Engineer Wharf), Aransas Pass Lats 27°50'o3| Long; 97 °03 '» BENCH MARK 1 (UoSoEo) is a standard disk, stamped "UcScEoD», BcM, Noo 1, ELEVo 5o043", set in the top of a block of concrete. It is located near the northwest corner of the UoSoEoDo Field Office property at Port Aransas, Texaso The bench mark is in a low sand mound, 116 feet west from the point of intersection of the center line of the TJoSoEoDo pier and the center line of the south jetty of the Corpus Christi Ship Channel, 77 feet southwest of the south jetty and 80 feet southeast of a riprap wing of the south jetty on west side of the UcSoE^D. property. In November 1938 it was reported that this bench mark was covered by 3^ inches of drifting sando Elevation? 4o95 feet above mean low water. BENCH MARK 2 (U.SoEo) is a standard disk, stamped "U.ScEoDo BoM^ Noo 2 ELEVc 4o410", The top of the bench mark is about 18 inches below the sur- face of the ground, surrounded by three guard stakes (2-inch pipes) o It is located on the west side of the U.S.E.D, Field Office property, about 238 feet southwest from Bench Mark 1 and about 146 feet northwest from Bench Mark 3 » In November 1938, it was reported that this bench mark was covered by drifting sand dunes to a depth of at least six feeto Elevations 4c. 30 feet above mean low water.' 30 TIDAL BENCH MARKS, STATE OF TEXAS Port Aransas (U= So Engineer Wharf) 9 Aransas Pass (cont'd.) BENCH MARK 3 (UoSoE<.) is a standard disk, unstamped, and the top of the bench mark is about 2 feet below the surface of the ground and is sur- rounded by three guard stakes (2-inch piDes)o The bench mark is 150 feet from the rear of the UcSoEcD. Field Office, Port Aransas, 37 feet from the north side of a large water tank and about 146 feet from Bench Mark 2o Elevations 3 „ 95 feet above mean low water => BENCH MARK 4 (1934) is a standard disk, stamped "Noo 4 1934", set in a concrete posto It is located on Mustang Island in the vicinity of the U.SoE£,Dc Field Officec The mark is situated in a flat sandy place about 13 feet east of a riprap wing of the south jetty and 47 feet north of the telephone line extending from Port Aransas to the UcSoE»D<, Field Office^ In November 1938, it was reported that this bench mark was covered by drifting sand dunes to a depth of at least six feet. Elevations 4o86 feet above mean low water o BENCH MARK 5 (1934) is a standard disk, stamped "No 5 1934", cemented in a drill hole in one of the large pieces of stone in the riprap wing of the south jetty. It is located on Mustang Island in the vicinity of the U.S.EoDo Field Office^ The mark is situated on the east side of the riprap wing about where it begins to be covered with small sand dunesc The stone in which the mark is set is well embedded in the sand, and is 3 7 feet south of the telephone line extending from Port Aransas to the U.S.EcDu Field Office. In November 1938, it was reported that this bench mark was covered with drifting sand dunes to a depth of at least six feeto Elevations 8.12 feet above mean low water c BENCH MARK 6 (1934) is a standard disk, stamped "No. 6 1934", cemented in a drill hole at the east end of the first step at the entrance to the Uo So Coast Guard Station at Port Aransas, on Mustang Island Elevation: 6o65 feet above mean low waterc BENCH MRF 7 (1938) is a standard disk, stamped "7 1938", set in the center of the concrete capping of south jetty, 60 feet from the westerly end of the concrete and in the center line of the jettyo Elevations 6o49 feet above mean low watero 31 TIDAL BENCH MARKS, STATE OF TEXAS Port Aransas (Uo ScEngineer Wharf), Aransas Pass (cont'd..) The mean low water datum at Port Aransas (U„ Su Engineer Wharf) is based on 10 months of automatic tide gage recordSj June 1934 = May 1935s reduced to mean values< The elevations of other tide planes referred to this datum are as follows s O C O c Mean high water Half tide level ocoo Mean low water datum STORM HIGH V;ATER = On October 7, 1919, the Superintendent of Light= houses. New Orleans, Lao reported that, due to the hurricane of September I45 1919, at Aransas Pass Light Station "The tide reached the level of the dwelling floor, approximately thirteen feet above mean hi^h tide, the great- est storm ever recorded in that localityo" Aransas Pass, Redfish Bay Latg 27°54'o0^ Longg 97'0B'o3 BENCH MARK 1 (1934) is a standard disk, stamped "1 1934", set in a concrete post situated on the top of the 18=foot earthen sea wall which extends along the water front, 364 feet northeast along the sea wall from the center line of the Aransas Harbor Terminal Railway, where the railway passes through the sea wall gate to the Port Aransas causeway, 80 feet back from the bulkhead line of the water front, 136 feet southwest along the sea wall from the center line of the first northwest-southeast street northeast of the street leading to the causeway, 56 feet southwest along the sea wall from a small house situated on the sea wall and 3o3 feet north= east of a power line posto Elevations 17o47 feet above mean low water o BENCH MARK 2 (1934) is a standard disk, stamped "2 1934", set in a drill hole on top of the wing of the retaining wall which extends around on the water side of the sea wall, mentioned in the description for Bench Mark lo The bench mark is located 22 o3 feet northeast of the center line of the Aransas Harbor Terminal Railway and 38 feet northwest of the bulkhead line of the water front o Elevations I0ol9 feet above mean low water u BENCH MARK 3 (1934) is a standard disk^ stamped "3 1934", located 32^ feet northwest of the center line of the second northeast=southwest street back from the earthern sea wall at the water front, being 853 feet northwest of the center line of this sea wall and 39 feet northeast of the center line of the Aransas Harbor Terminal Railwayo A small house owned by Howard Johnson is 65 feet north of this bench mark and the bench mark is about 3o3 feet north of a power line posto Elevations 3^08 feet above mean low water o 32 TIDAL BENCH MRKS, STATE OF TEXAS Aransas Pass^ Redfish B ay ( contM,,) The mean low water datum at Aransas PasSj Redfish Bay^ is based on 7 high waters and 7 low waters » August 5=12 ^ 1934, reduced to mean values- The elevations of other tide planes referred to this datum are as follows! Mean high water oo^o Half tide level oooo, Mean low water datum Rockportp Aransas Bay Lat8 23*0i'o4^ Long^ 97''o2*o8 BENCH I^iARK 1 (1934) is a standard disk, stamped "Noo 1 1934", set in a concrete posto It is located near the waterfront and south of a rail^ way pier extending from shore out past the rock breakwater^ A low wooden biilkhead extends around the area where the bench mark is set-, Tne bench mark is 31 feet south of the north side of this bulkhead and 54 feet west of the east side of the bulknead , EleTationj 4^51 feet above low=water datufflo BENCH MARK 2 (1934) is a standard disk, stamped "Noo 2 1934", set in a concrete posto It is located near the water front, 23 feet east of the northwest corner of Gibson's fish house, 3o3 feet north of the north side of the fish house and 39 feet west of a 3=foot wooden bulkhead extending in front of the fish house (Gibson's fish house is a sheet iron building located immediately east of the establishment of Go E^ Roberts, Boat Builderso) It was reported in October 1937, that this bench mark was buried under about 12 inches of sando Elevation: 3o67 feet above low=water datumo BENCH MARK 3 (1934) is a standard disk, stamoed "Noo 3 1934", cemented in a drill hole in the concrete sidewalks It is located at the northeast corner of the stone and brick building of the Rockport Mercantile Company, Lo Mo Bracht, proprietoro This building is located near the water front on State Highway Noo 35 and is one block east of the Southern Pacific Rail= way stationo Elevations 5o06 feet above low=water datum- There is practically no periodic tide in Aransas Bay at Rockport and low=water datiim is taken as a plane one-half foot below mean water levelo Mean water level is the average height of the water over a period of one year, March 1937 - February 1938o 33 TIDAL BENCH MAEKS, STATE OF TEXAS Port Bay-j Copano Bay Lats 2 8 '01* 085 Longs 97 "07 BENCH MARK 1 (1935) is a standard disk, stamped "Port Bay Noo 1 1935", set in a block of concrete projecting 2 inches above the surface of the ground located in Aransas Coxintyj., about 5 miles west of the town of Rockport on the road to Bayside^ and a half mile east of the south end of the cause= way over Port Bay, on the property of the Port Bay Hxinting Clubo The bench mark is 1 foot west of the easterly one of two fences 26 feet apart which enclose a lane bordered by oleanders, about 250 feet from the high water line and 344 feet northwest (magnetic) from the northeast corner of the fence surrounding the houses of the clubo Elevations 4o23 feet above low= water datum^ BENCH MARK 2 (1935) is a standard disk, stamoed "Port Bay Noo 2 1935", set in a block of concrete projecting 2 inches above the surface of the ground, 1 foot north of the fence in front of the club buildings, 3-|- feet west of the northeast corner of the fence, 125 feet east of the 8=inch flag= pole in front of the main clubhouseo It is located in Aransas County^, about 5 miles west of the town of Rockport on the road to Bayside and a half mile east of the south end of the causeway over Port Bay, on property of the Port Bay Hunting Clubo Elevations 6o38 feet above low=water datumo BENCH MARK 3 (1935) is a standard disk, stamped "Port Bay Noo 3 1935", set in a block of concrete projecting 2 inches above the surface of the ground, lo3 feet north of the fence in front of the clubhouse, 44^ feet east of the northwest fence corner, 353 feet west of the flagpole in front of the main clubhouse and 40^ feet north of the northeast comer of the chimney on the east side of the westernmost of four small houses west of the main clubhouseo It is located in Aransas County, about 5 miles west of Rockr^ort on the road to Bayside and a half mile east of the south end of the causeway over Port Bay, on property of the Port Bay Hunting Club.. Elevations 60 81 feet above low=water datumo There is practically no periociotide in Port Bay and low=water datum is taken as a plane one-half foot below mean water levelo Mean water level is the average height of the water over a period of 50 days, March 29 = May 19, 1935o Seadrift^ San Antonio Bay Lat^ 28''24»o4j Long? 96°43 ' , BENCH MARK 1 (1935) is a standard disk, stamoed "Seadrift No 1 1935"^ set in a concrete block, in Calhoun County, 2 feet northwest of the south= east corner of residence property of L» No Fisher, 1^ feet south of fence line, 57 feet southeast of the southeast corner of Lo No Fisher's house, 102 feet southeast of the center line of Main Street and 115 feet north of brow of bluff on bay,. Elevations 7^03 feet above low-water datum. 34 TIDAL BENCH MARKS, STATE OF TEXAS Seadriftg San Antonio Bay (cont'do) BENCH MARK 2 (1935) is a standard disk, stamped "Seadrift Noo 2 1935", set in a concrete block, on south side of Bay Shore Road, 33 feet north of bluff on bay shores, 29 feet south of the center line of Bay Shore road, 61 feet south=>southeast of the southeast corner of lot belonging to E^ G, Nelson, 162 feet east=southeast of the southeast corner of a wooden bridge over a small creek on Bay Shore Drive and 153 feet west by north from the center of the intersection of Mam Street ard Bay Shore Roado Elevations 6o31 feet above low=water datumn BENCH MARK 3 (1935) is a standard disk, stamped "Seadrift Noo 3 1935", set in a concrete block, located on the north side of Bay Shore Drive, 2c5 feet east of high line pole, 31 feet north of the center line of Bay Shore Road, 67 feet northwest of the center line of Main Street and 108 feet north of brow of bluff on bay^ Elevations 7o28 feet above low-water datumo There is practically no periodic tide m San Antonio Bay at Seadrift and low^water datum is taken as a plane one-^half foot below mean water level., Mean water level is the average height of the water over a period of 61 days, April 12 = June 18, 1935, reduced to mean values.. Harbor City, Corpus Christi Bay La t^ 27*49^2; Longs 97*ll'o6 BENCH MARK i (1934) is a standard disk, stamped "1 1934", set m a 10=inch by 10-inch by 36-inch concrete post, located 43 o6 feet north of the north end of the dock of Humble Oil Company at Harbor City at the south- west corner of small tin pumphouse. Elevation^ llc34 feet above mean low water o BENCH MARK 2 A (1941) is a standard disk, stamped "2 A=194l", set in a lO=inch by 10=inch by 36=^inch concrete post, located 26 feet north of the north wall of the tin foamite house, on the center line of the piimp= house at the Humble Oil and Refining Company* s docks and about 40 feet north of Bench Mark 1^ Elevations 11,65 feet above mean lew water., BENCH W^K 3 (1934) is a standard disk, stamped "3 1934", set similar- ly to Bench Mark 1, located 218 feet west of the pumphouse and Bench Mark 1, 8 feet west of the first electric pole west of the pumphouseo Elevation* 13ol4 feet above mean low ^vatero 35 TIDAL BENCH MARKS, STATE OF TEXAS Harbor City-j, Corpus Christ i Bay (conf^do) The mean low water datum at Harbor City is based on 48 high waters and 44 low waters, April 5 = August 31j 1934, reduced to mean values^ The elevations of other tide planes referred to this datum are as follows: Mean high water Half tide level ,. „ o . Mean low water datum OOOOOOOO O O • • O o Corpus Christi Lats 27''48^"7j Longg 97°23'o 6 BENCH MRK UoSoEoDc is a standard United States Engineer Department disks, unstamped, set in concreteo The top of the bench mark is 1 foot below the surface of the ground and protected by a 6-inch tile pipeo The bench mark is located on the grounds of the United States Engineer Depart= ment Field Station at the center of the Weather Bureau masti, a 50=foot steel, pyramidal structure, located 74o3 feet southwest of that section of the United States Engineer Department sea wall which is parallel to the Corpus Christi Ship Channel, 13 „ 6 feet east of a concrete fence post at the east end of Dan Reed Street o Notes This bench mark is the primary mark for United States Engineer Department work in this localityj USED Elevation is 4.705 feet^, Elevations 3o99 feet above mean low water c BENCH MARK 2 (1934) is a standard disk, stamped "Corpus Christi Noo 2 1934" s set in the top of a 12=inch by 12-inch by 3 6-inch concrete post, located on the grounds of the United States Engineer Department Field Sta= tion, 105 o 6 feet southwest of the northeast face of the southwest sea wall (United States Engineer Department) of the Corpus Christi Ship Channel (this distance is measured from a point 100 feet northwest of the entrance of the United Stetes Engineer Department boat slip and at right angles to the sea wall)o The bench mark is 2ol feet north of an east=west fence line north of Dan Reed Street, 54ol5 feet west of the comer concrete fence post which is located northwest of the northwest corner of the United States Engineer Department Field Office o Notes It was reported in June 1942 that this bench mark is now 8 feet below the present ground level o A pipe has been placed over the mark which makes the bench mark accessibleo El- evations 5o3 9 feet above mean low watero 36 TIDAL BENCH MARKS, STATE OF TEXAS Corpus Christ! (coRfd) BENCH MARK 3 (1934) is a standard disk, stamped "Corpus Christi No, 3 1934" > set m the top of a 12-inch by lE^inch by 3 6= inch concrete posts, extending 2 inches above the surface of the ground, located on the grounds of the United States Engineer Department Field Station^ 15 feet north of the southernmost fence line of the United States Engineer Department grounds, 109o5 feet west of the intersection of the south fence line and the east dea wall (United States Engineer Department), 39,92 feet east of the intersection of the south fence and the fence line east of the east end of Dan Reed Streetc Elevations 5ol4 feet above mean low water o BENCH MARK X 46 (1917) is a standard disk, stamped "X 46 1917 ELEVc 12o316 FT", set in the west wall of the Texas and New Orleans Railroad station^ at the left of the entrance to the waiting room Elevations 12,27 feet above mean low water ^ BENCH MARK Z 46 = 1 (U.SoEc) is a chiseled square on the extreme east end of the sill of the east window in the south wall of the City National Bank Building at Corpus Christie Elevations 9o79 feet above mean low water. The mean low water datum at Corpus Christi is based on 113 high waters and 115 low waters i March 7 - June ?0i, 1934, reduced to mean values. The elevations of other tide planes referred to this datum are as follows s oo*»o««oooo ooeooooooco o o o o o Mean high water Half tide level Mean low water datum Sea=level Datum of 1929 Mustang Island, Corpus Christi Bay Lats 27*4l^7i Long-. 97*11'. 2 BENCH MARK 1 (1934) is a standard triangulation station disk, stamped "FLAT 1933", set in the bell of a 4=inch cast iron pipe filled with con- crete, with top of bench mark about 12 inches above ground The bench mark is located on the west shore of Mustang Island^ 12 miles south-southwest of Fort AransaSv about 110 yards east= southeast from east shore of Corpus Christi Bay and about lo2 miles west of the Gulf of Mexico, 356 feet west- southwest from a 2=inch pipe, the top of which is about 2 feet above the level of the sando This area is a sand flat at present (19?4), but is subject to constant changes in appearance due to the shifting sand^ The magnetic bearing to Corpus Christi Water Tank (I4th Street) is 285° and to Plaza Hotel, 290*c Elevations 3o22 feet above mean low water o 37 TIDAL BENCH MARKS, STATE OF TEXAS Mustang Islandj Corpus Chn sti Bay (confdo) BENCH MARK 2 (1934) is a standard reference mark disk, stamped "FLAT Noo 1 1933"^ set in a cast iron pipe filled with concrete, projecting 1 foot above present (1934) sand levelc The bench mark is 115 feet from the triangulation station and bears 110° (magnetic) from itc Elevations 3o21 feet above mean low water o BENCH MARK 3 (1934) is a standard reference mark disk, stamped "FLAT Noo 2 1933" J set in a cast iron pipe filled with concrete , projecting 1 foot above present (1934) sand level o The bench mark is 105 feet from the triangulation station and bears 205* (magnetic) from ito Elevations 3o32 feet above mean low water o The mean low water datum at Mustang Island is based on 11 high waters and 11 low waters, April 18=30^ 1934^ reduced to mean valueso The eleva= tions of other tide planes referred to this datum are as follows g Feet Mean high water ooooooo.ooo 0o40 Half tide level ooooouooooo Oo20 Mean low water datum o => o o o o Oc.OO Padre Island, Brazos Santiago Lata 26'04^3g Longs 97*10^0 BENCH MARK 1 (1939) is a standard triangulation station disk^, stamped "BRAZOS 193 9", set in a 3=.inch pioe, at the Brazos Coast Guard Station at the south end of Padre Islandi, about 210 feet north-northwest of the Coast Guard Station house^ Elevations 3o84 feet above mean low watero BENCH MARK 2 (1939) is a standard disk^ stamped "Noo 2 1939", set in concrete about 100 feet north of Bench Mark 1 and about 310 feet north= northwest of the Brazos Coast Guard Station house. Elevation? 2o85 feet above mean low watero BENCH MARK 3 (1939) is a standard disk, stamped "Noo 3 193 9", set in the west corner of the top of a concrete cesspool, aboijt 105 feet south" southeast of Bench Mark 1 and about 110 feet north=northwest of the Brazes Coast Guard Station housco Elevations 6o33 feet above mean low watero BENCH MARK 1 (1939) is a standard disk, stamped "1 1939", set in a granite rock in the North Jetty at Brazos Santiago Entrance, near the point where the beach and jetty meeto Elevations 5o98 feet above mean low watero 38 TIDAL BENCH MARKS, STATE OF TEXAS Padre Island, Braaos Santiago (cont'do) BENCH MARK 2^ established by the United States EngineerSj is an unst&mpsd bronze disk, .set in a granite rock in the North Jetty at Br&zos Santiago Entrance, about 100 yards east of Bench Mark 1, The bench mark is -station ' (l + 5) of the United States Engineers^ Elevation;. 6.14 feet above mean low water BENCH ilARK 3^ established by the United States Engineers^ is an un- stamped bronze disk^ set ir a granite rock in the North Jetty at Brazes Santiago Entrance ^ about 3 50 yards east of Bench Mark !» The bench mark is station (2 + O) of the United States Engineer So Elevations 5o94 feet above mean low water ^ BENCH MARK 4s established by the United States Engineer Sj is an un- staniTjed bronze disk, set in a granite rock in the North Jetty at Brazos Santiago Entrance > about 500 yards east of Bench Mark i and near the east end of the jettyo The bench mark is station (2 + 5) of the United States Engineerso Elevation? 5o89 feet above mean low watero The mean low water datum at Padre Island, Brazos Santiago is based on 2 months of automatic tide gage records at Brazos Coast Guard Station, May ■= June 1939^ reduced to mean values^ The elevations of other tide planes referred to this datum are as follows t Feet Mean high water oooooooocoo Oc90 Half tide level c^oo.vvo.oo 0o45 Mean low water datum . < o . c o OoOO Point Isabel, Lagxma Madre Lati 26'04'. e> Long^ 97*12^.2 BENCH MARK 1 (1896) is the top of a copper bolt,, stamped '*27.7", pro= jecting about \ inch from the stone step, set m the left hand side of the door sill or upper step at the entrance to the abandoned Point Isabel Light- house:. Elevation? 27.91 feet above mean low water, BENCH MARK H 49 (1912) is a Uo S= Geological Survey standard cap^ stamped "8c. 93 1913 S'^i riveted on the top of a S^^mch iron pipe, located about 120 feet west of the west end of the Rio Grande Railway station and about 50 feet from the track,, Elevations 9ol6 feet above mean low water,. The mean low water datum at Point Isabel is based on 103 high waters and 100 low waters, March 12 ■= June 25, 1896, reduced to mean values o The elev&= tions of other tide planes referred to this datum are as follows? GOOOOCOOOCOO O • C O J Mean high water Half tide level ^ o ^ . c c <. Sea-level Datum of 1929 Mean low water datum c o c c o & UNIVEBSIT'?'- ,L0N01S.U«BANA ^Sll2 084235644