U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8772985 PUBLICATION DATE: 12/30/2020 Name: SARGENT, ICWW TX NOAA Chart: 11319 Latitude: 28° 46.3' N ( 28.77142) USGS Quad: CEDAR LAKES WEST Longitude: 95° 37.0' W ( -95.61717) To reach the station from the intersection of Farm to Market Road 457 and State Highway 35 in Bay City, Texas, proceed east on Farm to Market Road 457 for 27.5 mi (44.2 km) to the Intercoastal Waterway. The station is located near the west bank of the Intercoastal Water Way before the bridge to cross to Sargent Beach. The benchmarks are located on both sides of FM 457 near the swing bridge office and marina across the street. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 2985 E 2012 DESIGNATION: 877 2985 E MONUMENTATION: Flange-encased Rod VM#: 20704 AGENCY: Conrad Blucher Institute (CBI) IDB PID: SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBGD51 LATITUDE: 28° 46.3' N ( 28.77158) LONGITUDE: 95° 37.1' W ( -95.61853) The primary benchmark is a stainless steel deep rod located 78.02 m (256 ft) west of the centerline of FM 457, 29.95 m (98.3 ft) SW of telephone pole marked 04, 17.7 m north of the corner of the concrete bulkhead. The deep rod benchmark is driven 21.95 m (72.0 ft) until refusal and encased in a 15 cm (6 in) PVC pipe with a concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8772985 PUBLICATION DATE: 12/30/2020 Name: SARGENT, ICWW TX NOAA Chart: 11319 Latitude: 28° 46.3' N ( 28.77142) USGS Quad: CEDAR LAKES WEST Longitude: 95° 37.0' W ( -95.61717) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 2985 A 2012 DESIGNATION: 877 2985 A MONUMENTATION: Bench Mark disk VM#: 20700 AGENCY: Division of Nearshore Research (DNR) IDB PID: SETTING CLASSIFICATION: Concrete sidewalk OPUS PID: LATITUDE: 28° 46.3' N ( 28.77167) LONGITUDE: 95° 37.0' W ( -95.61739) The bench mark is a brass disk set flush in the concrete sidewalk of the USACE. The bench mark is located 23.24 m (76.2 ft) ENE of the centerline of the road, 16.68 m (54.7 ft) WNW of a light pole, and 14.04 m (46.1 ft) SE from the power pole closest to the USACE parking lot. BENCH MARK STAMPING: 2985 F 2019 DESIGNATION: 877 2985 F MONUMENTATION: Flange-encased Rod VM#: 23048 AGENCY: Conrad Blucher Institute IDB PID: SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBGW74 LATITUDE: 28° 46.4' N ( 28.77283) LONGITUDE: 95° 37.1' W ( -95.61858) The bench mark is located 52.00 m (170.6 ft) WNW of the northwest corner of a concrete access hatch on the north side of FM 457, 31 m (101.7 ft) SSE of the base of a draw bridge flashing light sign, 7.30 m (24.00 ft) WSW of the centerline of FM 457 and 0.30 m (1.00 ft) from a witness post. The bench mark is a stainless steel rod driven 20.70 m (67.90 ft) into the ground encased in a 6 in PVC pipe with concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8772985 PUBLICATION DATE: 12/30/2020 Name: SARGENT, ICWW TX NOAA Chart: 11319 Latitude: 28° 46.3' N ( 28.77142) USGS Quad: CEDAR LAKES WEST Longitude: 95° 37.0' W ( -95.61717) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 2985 G 2019 DESIGNATION: 877 2985 G MONUMENTATION: Flange-encased Rod VM#: 23049 AGENCY: Conrad Blucher Institute IDB PID: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 28° 46.4' N ( 28.77403) LONGITUDE: 95° 37.2' W ( -95.61939) The bench mark is located 25.63 m (84.10 ft) NNW of a truck weight limit sign, 7.52 m (24.7 ft) WSW of the centerline of FM 457, 6.07 M (19.9 ft) N of a concrete culvert below a caliche roadway and 0.3 m (1.0 ft) from an orange witness post. The bench mark is a stainless steel rod driven 20.7 m (67.9 ft) encased in a 6 in PVC pipe with concrete kickblock. BENCH MARK STAMPING: 2985 H 2020 DESIGNATION: 877 2985 H MONUMENTATION: Flange-encased Rod VM#: 23472 AGENCY: Conrad Blucher Institute (CBI) IDB PID: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 28° 46.5' N ( 28.77492) LONGITUDE: 95° 37.2' W ( -95.61972) The bench mark is a stainless steel rod located 22.3 m (73.2 ft) NNW of NW side of drainage culvert, 8.46 m (27.8 ft) NE of the centerline of FM 457, 3.2 m (10.5 ft) NNW of CR 210 sign and 0.8 m (2.6 ft) SSW of a witness post. The benchmark is driven 23.2 m (76.1 ft) into the ground encased in a 6 inch (15 cm) PVC pipe with concrete kick block.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8772985 PUBLICATION DATE: 12/30/2020 Name: SARGENT, ICWW TX NOAA Chart: 11319 Latitude: 28° 46.3' N ( 28.77142) USGS Quad: CEDAR LAKES WEST Longitude: 95° 37.0' W ( -95.61717) T I D A L D A T U M S Tidal datums at SARGENT, ICWW based on: LENGTH OF SERIES: 4 YEARS TIME PERIOD: January 2016 - December 2019 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8772447 FREEPORT, FREEPORT HARBOR CHANNEL Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (09/21/2020) = 1.223 MEAN HIGHER HIGH WATER MHHW = 0.209 MEAN HIGH WATER MHW = 0.198 MEAN SEA LEVEL MSL = 0.119 MEAN TIDE LEVEL MTL = 0.106 MEAN LOW WATER MLW = 0.013 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum NAVD88 = -0.111 LOWEST OBSERVED WATER LEVEL (01/04/2018) = -0.482 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 2985 E 2012 0.709 0.511 2985 A 2012 1.495 1.297 2985 F 2019 0.553 0.355 2985 G 2019 1.002 0.804 2985 H 2020 0.418 0.220 Foot Notes: Bench mark '2985 H 2020' is based on one differential leveling connection and does not meet the quality control standards of the NOS. Therefore, caution should be used when deriving elevations for this mark.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8772985 PUBLICATION DATE: 12/30/2020 Name: SARGENT, ICWW TX NOAA Chart: 11319 Latitude: 28° 46.3' N ( 28.77142) USGS Quad: CEDAR LAKES WEST Longitude: 95° 37.0' W ( -95.61717) D E F I N I T I O N S Mean Sea Level (MSL) is a tidal datum determined over a 19-year National Tidal Datum Epoch. It pertains to local mean sea level and should not be confused with the fixed datums of North American Vertical Datum of 1988 (NAVD88). NAVD88 is a fixed datum derived from a simultaneous, least squares, minimum constraint adjustment of Canadian/Mexican/United States leveling observations. Local mean sea level observed at Father Point/Rimouski, Canada was held fixed as the single initial constraint. NAVD88 replaces NGVD29 as the national standard geodetic reference for heights. Bench mark elevations relative to NAVD88 are available from NGS through the World Wide Web at National Geodetic Survey. NGVD29 is a fixed datum adopted as a national standard geodetic reference for heights but is now considered superseded. NGVD29 is sometimes referred to as Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological Survey Topographic Quads. NGVD29 was originally derived from a general adjustment of the first-order leveling networks of the U.S. and Canada after holding mean sea level observed at 26 long term tide stations as fixed. Numerous local and wide-spread adjustments have been made since establishment in 1929. Bench mark elevations relative to NGVD29 are available from the National Geodetic Survey (NGS) data base via the World Wide Web at National Geodetic Survey. NAVD88 and NGVD29 are fixed geodetic datums whose elevation relationships to local MSL and other tidal datums may not be consistent from one location to another. The Vertical Mark Number (VM#) and PID# shown on the bench mark sheet are unique identifiers for bench marks in the tidal and geodetic databases, respectively. Each bench mark in either database has a single, unique VM# and/or PID# assigned. Where both VM# and PID# are indicated, both tidal and geodetic elevations are available for the bench mark listed. The NGS's Integrated Data Base (IDB PID) provides geodetic datum based on traditionally leveled and bluebooked ties to the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/. The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/. The NAVD88 elevation is shown on the Elevations of Tidal Datums Table Referred to MLLW only when two or more of the bench marks listed have NAVD88 elevations. The NAVD88 elevation relationship shown in the table is derived from an average of several bench mark elevations relative to tide station datum. As a result of this averaging, NAVD88 bench mark elevations computed indirectly from the tidal datums elevation table may differ slightly from NAVD88 elevations listed for each bench mark in the NGS database.