U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 8770613 PUBLICATION DATE: 12/14/2020 Name: MORGANS POINT, BARBOURS CUT TX NOAA Chart: 11328 Latitude: 29° 40.9' N ( 29.68169) USGS Quad: TEXAS CITY Longitude: 94° 59.1' W ( -94.98500) To reach the tidal bench marks from the intersection of Texas State Highway 146 and W. Barbours Cut Boulevard in La Porte, proceed east on W. Barbours Cut Boulevard for approximately 0.8 km (0.5 mi) to the point where W. Barbours Cut Boulevard becomes E. Barbours Cut Boulevard, then continue east on E. Barbours Cut Boulevard for 3.2 km (2.0 mi) to the Port of Houston Authority entrance gates, then continue through the gates and bear left, crossing the railroad tracks, and then proceed to the U-shaped concrete dock on the ship channel. The bench marks are located in the vicinity of the Port of Houston Authority property. The tide gage and staff are located on a small wooden dock on the east side of the concrete dock. Closest access to the station is Gate 4. Once inside proceed north to the bank, the station is located on a u-shaped pier. Contact Anthony Flenoy (Security Manager) at 713-670-3663 for any access issues. T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 8770613 PUBLICATION DATE: 12/14/2020 Name: MORGANS POINT, BARBOURS CUT TX NOAA Chart: 11328 Latitude: 29° 40.9' N ( 29.68169) USGS Quad: TEXAS CITY Longitude: 94° 59.1' W ( -94.98500) T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: E 1201 1973 DESIGNATION: E 1201 MONUMENTATION: Bench Mark disk VM#: 11218 AGENCY: National Geodetic Survey (NGS) IDB PID#: AW1556 SETTING CLASSIFICATION: Concrete bridge abutment OPUS PID: LATITUDE: 29° 40.9' N ( 29.68133) LONGITUDE: 94° 59.1' W ( -94.98539) The bench mark is a disk set in top of the east end of the south concrete abutment of the most westerly bridge of the Houston Port Authority Container Terminal Dock, 84 m (276 ft) NW of the centerline of Morgans Point-La Porte Road, 0.37 m (1.2 ft) east of the SE corner of a concrete walkway, and 0.3 m (1 ft) above the bridge floor.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 8770613 PUBLICATION DATE: 12/14/2020 Name: MORGANS POINT, BARBOURS CUT TX NOAA Chart: 11328 Latitude: 29° 40.9' N ( 29.68169) USGS Quad: TEXAS CITY Longitude: 94° 59.1' W ( -94.98500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: MORGAN PT 3 USE NO 3 1973 DESIGNATION: MORGAN PT 3 RM 3 MONUMENTATION: Reference Mark disk VM#: 11214 AGENCY: National Geodetic Survey (NGS) IDB PID#: AW1554 SETTING CLASSIFICATION: Curb OPUS PID: LATITUDE: 29° 40.9' N ( 29.68142) LONGITUDE: 94° 59.1' W ( -94.98542) The bench mark is a disk set on the top center of the east curb of the west bridge to the Houston Port Authority Container Terminal Dock at Morgans Point, 10.88 m (35.7 ft) NE of Bench Mark MORGAN POINT 3 USE, and 9.91 m (32.5 ft) north of the entrance to the west bridge of the dock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 8770613 PUBLICATION DATE: 12/14/2020 Name: MORGANS POINT, BARBOURS CUT TX NOAA Chart: 11328 Latitude: 29° 40.9' N ( 29.68169) USGS Quad: TEXAS CITY Longitude: 94° 59.1' W ( -94.98500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: MORGAN PT 3 USE 1973 DESIGNATION: MORGAN PT 3 MONUMENTATION: Triangulation Station disk VM#: 11215 AGENCY: National Geodetic Survey (NGS) IDB PID#: AW1555 SETTING CLASSIFICATION: Head wall OPUS PID#: AW1555 LATITUDE: 29° 40.9' N ( 29.68131) LONGITUDE: 94° 59.1' W ( -94.98544) The bench mark is a disk set in the south end of the west wing of the head wall of the west bridge to the Houston Port Authority Container Terminal Dock, and 1 m (2 ft) higher than the ramp leading to the dock. BENCH MARK STAMPING: 0613 H 2004 DESIGNATION: 877 0613 H TIDAL MONUMENTATION: Tidal Station disk VM#: 17724 AGENCY: Division of Nearshore Research IDB PID#: SETTING CLASSIFICATION: Pier OPUS PID#: BBGD01 LATITUDE: 29° 40.9' N ( 29.68144) LONGITUDE: 94° 59.1' W ( -94.98461) The bench mark is located 47.0 m (154.2 ft) SSW of the SW corner of a U-shaped concrete pier, 16.0 m (52.50 ft) W of the centerline of the paved road leading to the pier, 0.67 m (2.20 ft) SW of the SE corner of the Port of Houston Authority Fire Station, and 0.34 m (1.12 ft) S of the south face of the fire station.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 8770613 PUBLICATION DATE: 12/14/2020 Name: MORGANS POINT, BARBOURS CUT TX NOAA Chart: 11328 Latitude: 29° 40.9' N ( 29.68169) USGS Quad: TEXAS CITY Longitude: 94° 59.1' W ( -94.98500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 877 0613 K 2018 DESIGNATION: 877 0613 K MONUMENTATION: Metal Rod VM#: 22711 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 29° 40.9' N ( 29.68147) LONGITUDE: 94° 59.1' W ( -94.98436) The mark is located 18.20 m (59.7 ft) NNE of west corner of fire deptment building, 17.40 m (57.1 ft) east of the east bulkhead corner of dock entrance, 11.61 m (38.1 ft) NNW of southern most powerpole on the north side of the fire dept building, 4.18 m (13.7 ft) east of the eastern corner of concrete walkway leading to fire boat. The benchmark is set flush with the ground, crimped to a stainless steel rod driven 15.8 m (51.8 ft) to refusal and encased in a 6-incn PVC pipe with concrete kickblock. BENCH MARK STAMPING: 877 0613 M 2018 DESIGNATION: 877 0613 M MONUMENTATION: Metal Rod VM#: 22712 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBGS59 LATITUDE: 29° 40.9' N ( 29.68147) LONGITUDE: 94° 59.0' W ( -94.98389) The mark is located 38.80 m (127.3 ft) east of the NW corner of the concrete parking lot east of the fire dept building, 30.00 m (98.4 ft) south of southern most shore piling on the north/south running fence line, 11.00 m (36.1 ft) south of powerpole along the chainlink fence line, 1.01 m (3.3 ft) west of the chainlink fence running north/south, 1.01 m (3.3 ft) north of the chainlink fence running east/west. The benchmark is set flush with the ground, crimped to a stainless steel rod driven 17.1 m (56 ft) to refusal, encased in 6 in PVC pipe with concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 8770613 PUBLICATION DATE: 12/14/2020 Name: MORGANS POINT, BARBOURS CUT TX NOAA Chart: 11328 Latitude: 29° 40.9' N ( 29.68169) USGS Quad: TEXAS CITY Longitude: 94° 59.1' W ( -94.98500) T I D A L D A T U M S Tidal datums at MORGANS POINT, BARBOURS CUT based on: LENGTH OF SERIES: 21 YEARS TIME PERIOD: April 1997 - October 2019 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8771450 GALVESTON PIER 21, GALVESTON CHANNEL Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (09/12/2008) = 2.017 MEAN HIGHER HIGH WATER MHHW = 0.406 MEAN HIGH WATER MHW = 0.384 MEAN SEA LEVEL MSL = 0.222 MEAN TIDE LEVEL MTL = 0.211 MEAN LOW WATER MLW = 0.038 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum NAVD88 = -0.004 LOWEST OBSERVED WATER LEVEL (01/19/1996) = -0.998 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW E 1201 1973 4.421 4.037 MORGAN PT 3 USE NO 3 1973 4.438 4.054 MORGAN PT 3 USE 1973 4.428 4.044 0613 H 2004 4.374 3.990 877 0613 K 2018 4.691 4.307 877 0613 M 2018 5.226 4.842
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 8770613 PUBLICATION DATE: 12/14/2020 Name: MORGANS POINT, BARBOURS CUT TX NOAA Chart: 11328 Latitude: 29° 40.9' N ( 29.68169) USGS Quad: TEXAS CITY Longitude: 94° 59.1' W ( -94.98500) 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.