U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8770777 PUBLICATION DATE: 07/06/2020 Name: MANCHESTER, HOUSTON SHIP CHANNEL TX NOAA Chart: 11329 Latitude: 29° 43.6' N ( 29.72622) USGS Quad: PARK PLACE Longitude: 95° 15.9' W ( -95.26578) From the junction of Interstate 10 and the I-610 loop on the east side of Houston, proceed south on the I-610 loop to Exit 29 (Port of Houston), take Exit 29 and go for 0.7 km (0.4 mi), turn right and head west for 0.2 km (0.1 mi) to the main gate, turn left at the gate 8 access point, once through the security gate turn left and travel east on lower level road for 0.5 km (0.31 mi). The tide station is south of Lower Level Road, 55.9 meters east of the 610 Bridge, along the ship channel. The benchmarks are located along Lower Level Road and across the chain link fence that surrounds the parking lot above the road. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: LUB 0777 A 1995 DESIGNATION: 877 0777 A MONUMENTATION: Bench Mark disk VM#: 15895 AGENCY: Lamar University Beaumont (LUB) IDB PID: SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBFY46 LATITUDE: 29° 43.6' N ( 29.72669) LONGITUDE: 95° 16.1' W ( -95.26753) The primary bench mark is a brass disk located 4.33 m (14.2 ft) NNE of the north side of a road along Wharf 31, 3.66 m (12.0 ft) NW of a fire hydrant , 2.74 m (9.0 ft) SSW of the south edge of railroad tracks, and 0.79 m (2.6 ft) SE of a wood utility pole. The bench mark set 2 cm (0.8 in) below ground, crimped to a stainless steel rod driven 16.76 m (55.0 ft) to refusal, and encased in a 6-inch 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: 8770777 PUBLICATION DATE: 07/06/2020 Name: MANCHESTER, HOUSTON SHIP CHANNEL TX NOAA Chart: 11329 Latitude: 29° 43.6' N ( 29.72622) USGS Quad: PARK PLACE Longitude: 95° 15.9' W ( -95.26578) T I D A L B E N C H M A R K S BENCH MARK STAMPING: LUB 0777 C 1995 DESIGNATION: 877 0777 C MONUMENTATION: Bench Mark disk VM#: 15897 AGENCY: Lamar University Beaumont (LUB) IDB PID#: DO9988 SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: DO9988 LATITUDE: 29° 43.6' N ( 29.72711) LONGITUDE: 95° 16.1' W ( -95.26781) The bench mark is a brass survey disk located 60.29 m (197.8 ft) west of a wood utility pole, 59.13 m (194.0 ft) west of LUB 0777 B 1995, 46.88 m (153.8 ft) east of a wood utility pole, 45.9 m (150.6 ft) east of LUB 0777 D 1995, and 34.5 m (113.2 ft) north of the railroad tracks. The bench mark is recessed 15 cm (0.5 ft) below the ground, crimped to the top of a stainless steel rod driven 16.76 m (55.0 ft) to refusal, and encased in a 6-inch PVC pipe with a concrete kickblock. BENCH MARK STAMPING: LUB 0777 D 1995 DESIGNATION: 877 0777 D MONUMENTATION: Bench Mark disk VM#: 15898 AGENCY: Lamar University Beaumont (LUB) IDB PID: SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBDQ12 LATITUDE: 29° 43.6' N ( 29.72714) LONGITUDE: 95° 16.1' W ( -95.26828) The bench mark is a brass survey disk set in the vicinity of warehouse no. 31, located 45.9 m (150.6 ft) west of BM 0777 C 1995, 42.6 m (139.8 ft) south of a chainlink fence corner post, and 1.5 m (4.9 ft) NE of a power pole. The bench mark is a recessed about 15 cm (0.5 ft) below the ground, crimped to the top of a stainless steel rod driven 16.76 m (55.0 ft) to refusal, and encased in a 6-inch PVC pipe with a concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8770777 PUBLICATION DATE: 07/06/2020 Name: MANCHESTER, HOUSTON SHIP CHANNEL TX NOAA Chart: 11329 Latitude: 29° 43.6' N ( 29.72622) USGS Quad: PARK PLACE Longitude: 95° 15.9' W ( -95.26578) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0777 F 2002 DESIGNATION: 877 0777 F MONUMENTATION: Bench Mark disk VM#: 16912 AGENCY: Conrad Blucher Institute (CBI) IDB PID: SETTING CLASSIFICATION: Sidewalk OPUS PID: LATITUDE: 29° 43.6' N ( 29.72617) LONGITUDE: 95° 16.0' W ( -95.26633) The bench mark is a disk located 109.2 m (358.3 ft) SE of bench mark 877 0777 A, 65.5 m (214.9 ft) ESE of the NE corner of the warehouse building at Wharf 31, and 3.00 m (9.8 ft) NE of a concrete bridge support. The bench mark is set flush in a concrete sidewalk. BENCH MARK STAMPING: 0777 H 2018 DESIGNATION: 877 0777 H MONUMENTATION: Tidal Station disk VM#: 22794 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: retaining wall OPUS PID: LATITUDE: 29° 43.6' N ( 29.72608) LONGITUDE: 95° 16.0' W ( -95.26700) The bench mark is located on top of the retaining wall of the ramp that leads in to the east side of the easternmost warehouse west of the Highway 610 bridge, 32.4 m (106.3 ft) NE of the SE corner of the warehouse, 24.2 m (79.4 ft) NW of the NW corner of the dock bull rail, 23.0 m (75.5 ft) SW of the westernmost column of the southernmost set of four bridge support columns, 9.5 m (31.2 ft) east of the bay door to which the ramp leads
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8770777 PUBLICATION DATE: 07/06/2020 Name: MANCHESTER, HOUSTON SHIP CHANNEL TX NOAA Chart: 11329 Latitude: 29° 43.6' N ( 29.72622) USGS Quad: PARK PLACE Longitude: 95° 15.9' W ( -95.26578) T I D A L D A T U M S Tidal datums at MANCHESTER, HOUSTON SHIP CHANNEL based on: LENGTH OF SERIES: 8 YEARS TIME PERIOD: 01/1998-12/2002, 01/2016-12/2018 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8770613 MORGANS POINT, BARBOURS CUT Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (08/29/2017) = 3.679 MEAN HIGHER HIGH WATER MHHW = 0.493 MEAN HIGH WATER MHW = 0.458 MEAN SEA LEVEL MSL = 0.270 MEAN TIDE LEVEL MTL = 0.265 MEAN LOW WATER MLW = 0.073 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum NAVD88 = -0.040 LOWEST OBSERVED WATER LEVEL (03/09/1998) = -0.987 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW LUB 0777 A 1995 3.063 2.605 LUB 0777 C 1995 8.879 8.421 LUB 0777 D 1995 9.016 8.558 0777 F 2002 4.371 3.913 0777 H 2018 4.080 3.622
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8770777 PUBLICATION DATE: 07/06/2020 Name: MANCHESTER, HOUSTON SHIP CHANNEL TX NOAA Chart: 11329 Latitude: 29° 43.6' N ( 29.72622) USGS Quad: PARK PLACE Longitude: 95° 15.9' W ( -95.26578) 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.