U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 PUBLICATION DATE: 08/02/2000 Station ID: 8770733 SUPERCEDED DATE: 04/21/2003 Name: LYNCHBURG LANDING, SAN JACINTO R. TEXAS NOAA Chart: 11326 Latitude: 29° 45.9' N USGS Quad: HIGHLANDS Longitude: 95° 4.7' W To reach the tidal bench marks from the Post Office in Highlands, travel south on Crosby-Lynchburg Road for 5.8 km (3.6 mi) to Lynchburg Ferry Landing. The bench marks are located around the ferry landing. The tide gage and staff were on Old Ferry Landing, now in ruins. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: LUB 0733 C 1995 DESIGNATION: 877 0773 C MONUMENTATION: Survey disk VM#: 16091 AGENCY: Lamar University Beaumont (LUB) PID#: AJ4423 SETTING CLASSIFICATION: Stainless steel rod The primary bench mark is a disk set in the east side of the Lynchburg Landing Ferry compound, 25.51 m (83.7 ft) NW of a fence on the SE side of the compound, 10.88 m (35.7 ft) WSW of the NE corner of the main ferry building, and 4.81 m (15.8 ft) ENE of the SE corner of the main building. The bench mark is crimped to a stainless steel rod driven 16.8 m (55 ft) to refusal, and encased in a 6-inch PVC pipe with concrete kickblock. BENCH MARK STAMPING: C 1277 1978 DESIGNATION: C 1277 MONUMENTATION: Bench Mark disk VM#: 11774 AGENCY: National Geodetic Survey (NGS) PID#: AW0942 SETTING CLASSIFICATION: Stainless steel rod The bench mark is a disk set inside the Lynchburg Ferry compound, 32.92 m (108.0 ft) east of the centerline of the Crosby Lynchburg Road, 29.66 m (97.3 ft) NE of the NE corner of the main building, 9.02 m (29.6 ft) west of the chain link fence around the compound, 0.46 m (1.5 ft) east of a utility pole, and 0.21 m (0.7 ft) north of a witness post. The bench mark is set 0.12 m (0.4 ft) below ground, crimped to an stainless steel rod driven 14.6 m (48 ft), and encased in a 5-inch NGS logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 PUBLICATION DATE: 08/02/2000 Station ID: 8770733 SUPERCEDED DATE: 04/21/2003 Name: LYNCHBURG LANDING, SAN JACINTO R. TEXAS NOAA Chart: 11326 Latitude: 29° 45.9' N USGS Quad: HIGHLANDS Longitude: 95° 4.7' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0733 A 1983 DESIGNATION: 877 0733 A MONUMENTATION: Tidal Station disk VM#: 11775 AGENCY: National Ocean Survey (NOS) PID: SETTING CLASSIFICATION: Concrete foundation The bench mark is a disk set in the SW corner of 2 m x 2 m (6 ft x 8 ft) concrete foundation for a pressure tank near the Civil Defense Power Station, 23.71 m (77.8 ft) north of the centerline of Crosby Lynchburg Road, 10.36 m (34.0 ft) SE of SW corner of the Civil Defense tower fence, and 0.27 m (0.9 ft) north of the south edge of the concrete foundation. BENCH MARK STAMPING: LUB 0733 D 1995 DESIGNATION: 877 0773 D MONUMENTATION: Survey disk VM#: 16092 AGENCY: Lamar University Beaumont (LUB) PID: SETTING CLASSIFICATION: Stainless steel rod The bench mark is a disk set in the east side of the Lynchburg Landing Ferry compound, 12.19 m (40.0 ft) NNW of the NW corner of the main ferry building, 11.61 m (38.1 ft) south of the centerline of Crosby Lynchburg Road, and 2.56 m (8.4 ft) WSW of a flag pole. The bench mark is crimped to a stainless steel rod driven 16.8 m (55 ft) to refusal, and encased in a 6-inch PVC pipe with concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 PUBLICATION DATE: 08/02/2000 Station ID: 8770733 SUPERCEDED DATE: 04/21/2003 Name: LYNCHBURG LANDING, SAN JACINTO R. TEXAS NOAA Chart: 11326 Latitude: 29° 45.9' N USGS Quad: HIGHLANDS Longitude: 95° 4.7' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: LUB 0733 E 1995 DESIGNATION: 877 0773 E MONUMENTATION: Survey disk VM#: 16093 AGENCY: Lamar University Beaumont (LUB) PID: SETTING CLASSIFICATION: Stainless steel rod The bench mark is a disk set at the NW corner of the ferry maintenance building in the east side of the Lynchburg Landing Ferry compound, 22.89 m (75.10 ft) SSE of the centerline of Crosby Lynchburg Road, 15.79 m (51.8 ft) west of the NE corner of the maintenance building, 2.74 m (9.0 ft) NW of the NW corner of the maintenance building, and 0.61 m (2.0 ft) south of the corner of a fence. The bench mark is crimped to a stainless steel rod driven 16.8 m (55 ft) to refusal, and encased in a 6-inch PVC pipe with concrete kickblock. BENCH MARK STAMPING: LUB 0733 F 1995 DESIGNATION: 877 0773 F MONUMENTATION: Survey disk VM#: 16094 AGENCY: Lamar University Beaumont (LUB) PID: SETTING CLASSIFICATION: Stainless steel rod The bench mark is a disk set along the north side of Crosby Lynchburg Road near the east side of the Lynchburg Landing Ferry compound, 38.95 m (127.8 ft) NNW of the NW corner of the ferry maintenance building, 8.02 m (26.3 ft) NNW of Crosby Lynchburg Road, and 0.67 m (2.2 ft) SE of a wood utility pole. The bench mark is crimped to a stainless steel rod driven 16.8 m (55 ft) to refusal, and encased in a 6-inch PVC pipe with concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 PUBLICATION DATE: 08/02/2000 Station ID: 8770733 SUPERCEDED DATE: 04/21/2003 Name: LYNCHBURG LANDING, SAN JACINTO R. TEXAS NOAA Chart: 11326 Latitude: 29° 45.9' N USGS Quad: HIGHLANDS Longitude: 95° 4.7' W T I D A L D A T U M S Tidal datums at LYNCHBURG LANDING, SAN JACINTO R. based on: LENGTH OF SERIES: 1 YEAR TIME PERIOD: January 1996 - December 1996 TIDAL EPOCH: 1960-1978 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 (11/16/1996) = 1.117 MEAN HIGHER HIGH WATER MHHW = 0.432 MEAN HIGH WATER MHW = 0.406 MEAN SEA LEVEL MSL = 0.242 MEAN TIDE LEVEL MTL = 0.237 MEAN LOW WATER MLW = 0.069 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (01/19/1996) = -1.019 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW LUB 0733 C 1995 2.178 1.772 C 1277 1978 0.989 0.583 0733 A 1983 1.748 1.342 LUB 0733 D 1995 2.118 1.712 LUB 0733 E 1995 1.282 0.876 LUB 0733 F 1995 0.775 0.369
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 PUBLICATION DATE: 08/02/2000 Station ID: 8770733 SUPERCEDED DATE: 04/21/2003 Name: LYNCHBURG LANDING, SAN JACINTO R. TEXAS NOAA Chart: 11326 Latitude: 29° 45.9' N USGS Quad: HIGHLANDS Longitude: 95° 4.7' W Foot Notes: Galveston Bay, Texas has anomalous relative sea level trends compared to most other geographic regions in the United States. This is due to a general subsidence of land in the area, which has been occurring at a rapid rate. Because of the magnitude of the sea level trends in these areas. NOAA has adopted a procedure for computing accepted tidal datums for the National Water Lvevel Observation Network (NWLON) using the last several years of sea level data rather than the 1960 - 1978 tidal epoch. The tide ranges are still based on the 1960 - 1978 National Tidal Datum Epoch (NTDE) and are applied to the five year (1990 - 1994) mean tide level (MTL) to compute the other tidal datums. The adoption of this procedure was necessary to assure that these tidal datums accurately represent the existing stand of sea level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 PUBLICATION DATE: 08/02/2000 Station ID: 8770733 SUPERCEDED DATE: 04/21/2003 Name: LYNCHBURG LANDING, SAN JACINTO R. TEXAS NOAA Chart: 11326 Latitude: 29° 45.9' N USGS Quad: HIGHLANDS Longitude: 95° 4.7' W 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 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.