U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
Station ID: 8771510 PUBLICATION DATE: 04/21/2003
Name: GALVESTON PLEASURE PIER, GULF OF MEXICO
TEXAS
NOAA Chart: 11324 Latitude: 29° 17.1' N
USGS Quad: GALVESTON Longitude: 94° 47.3' W
To reach the tidal bench marks from the Post Office on the west side of
Rosenberg Avenue (25th Street) and Winnie Street (Avenue G), proceed SE on
Rosenberg Avenue for 1.6 km (1.0 mi) to Seawall Boulevard and the entrance to
Flagship Pier (formerly known as Pleasure Pier). The bench marks are primarily
east of the pier on the seawall along Seawall Boulevard. The tide gage and staff
are approximately 0.3 km (0.2 mi) SE of Seawall Boulevard on the SE corner of
the pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 43 1957
DESIGNATION: 877 1510 TIDAL 43
MONUMENTATION: Tidal Station disk VM#: 854
AGENCY: US Coast and Geodetic Survey (USC&GS) PID#: AW0592
SETTING CLASSIFICATION: Concrete pier deck
The primary bench mark is a disk set in the top of the concrete floor of the
Flagship Motor Hotel Fishing Pier, 0.3 km (0.2 mi) SE of the center line of
Seawall Boulevard, at a narrow drive between the Hotel and Fishing Pier parking
lots, 18.84 m (61.8 ft) NW of the NW edge of the Fishing Pier parking lot, 10.73
m (35.2 ft) SE of the SE edge of the hotel parking lot, 1.2 m (3.9 ft) east of a
wire gate, and 0.37 m (1.2 ft) SW of the NE edge of the drive.
BENCH MARK STAMPING: WALL 1933 ELEV 15.279 FT
DESIGNATION: WALL
MONUMENTATION: Triangulation Station disk VM#: 855
AGENCY: US Coast and Geodetic Survey (USC&GS) PID#: AW0588
SETTING CLASSIFICATION: Concrete sea wall
The bench mark is a disk set in the top of the sea wall, along Seawall Boulevard
about midway between 12th and 13th Streets, 10.91 m (35.8 ft) SW of the west
corner of a concrete bench, 0.79 m (2.6 ft) south of a small angle in the
sidewalk, 0.52 m (1.7 ft) SE of the SE edge of the sidewalk, and about level
with the boulevard.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 8771510 PUBLICATION DATE: 04/21/2003
Name: GALVESTON PLEASURE PIER, GULF OF MEXICO
TEXAS
NOAA Chart: 11324 Latitude: 29° 17.1' N
USGS Quad: GALVESTON Longitude: 94° 47.3' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: E 168 1936 ELEV 15.502 FT
DESIGNATION: E 168
MONUMENTATION: Bench Mark disk VM#: 856
AGENCY: US Coast and Geodetic Survey (USC&GS) PID#: AW0590
SETTING CLASSIFICATION: Concrete sea wall
The bench mark is a disk set in the top center of the concrete sea wall in line
with the center of a rock bracker, about 104 m (342 ft) SW of the junction of
Seawall Boulevard and 23rd Street North across the boulevard from Playland Park,
21.18 m (69.5 ft) NE of the NE end of a concrete bench, 8.47 m (27.8 ft) SW of
the south corner of a concrete block planter with two palm trees, 5.43 m (17.8
ft) SE of the SE curb of the boulevard, 0.94 m (3.1 ft) north of the NW end of
a pipe handrail along steps leading to the beach, and about 0.3 m (1 ft) higher
than the boulevard.
BENCH MARK STAMPING: WALL NO 1 1942
DESIGNATION: WALL RM 1
MONUMENTATION: Reference Mark disk VM#: 857
AGENCY: US Coast and Geodetic Survey (USC&GS) PID#: AW0589
SETTING CLASSIFICATION: Concrete sea wall
The bench mark is a disk set in the top of the concrete sea wall, along Seawall
Boulevard about midway between 12th and 13th Streets, 14.23 m (46.7 ft) NE of
the station, 1.71 m (5.6 ft) NE of the east corner of a conctete bench, 1.19 m
(3.9 ft) SE of the SE edge of the sidewalk, and about level with the boulevard.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 8771510 PUBLICATION DATE: 04/21/2003
Name: GALVESTON PLEASURE PIER, GULF OF MEXICO
TEXAS
NOAA Chart: 11324 Latitude: 29° 17.1' N
USGS Quad: GALVESTON Longitude: 94° 47.3' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 44 1957
DESIGNATION: 877 1510 TIDAL 44
MONUMENTATION: Tidal Station disk VM#: 858
AGENCY: US Coast and Geodetic Survey (USC&GS) PID#: AW0591
SETTING CLASSIFICATION: Concrete sea wall
The bench mark is a disk set in the top center of the concrete sea wall, at the
junction of Seawall Boulevard and Rosenberg Avenue North (25th Street), 3 m (10
ft) SW of the centerline of a concrete ramp leading down to the beach, 0.88 m
(2.9 ft) NW of the extended concrete curb of the ramp leading up along the NE
side of the Flagship Motor Hotel Pier, 0.70 m (2.3 ft) north of the NE corner of
a chain link fence around the Flagship Motor Hotel, and about 0.61 m (2.0 ft)
higher than the boulevard.
BENCH MARK STAMPING: NO 10 1973
DESIGNATION: 877 1510 TIDAL 10
MONUMENTATION: Tidal Station disk VM#: 859
AGENCY: National Ocean Survey (NOS) PID#: AW1221
SETTING CLASSIFICATION: Concrete sea wall
The bench mark is a disk set flush in the top of the sea wall at the junction of
Seawall Boulevard and Tremont Street (22nd Street), 17.28 m (56.7 ft) ESE of the
centerline of Seawall Boulevard, 7.50 m (24.6 ft) SW of steps leading to the
beach at the foot of Tremont Street, 4.33 m (14.2 ft) SW of the SW corner of the
southwestern-most of two large monuments commnemorating sea wall construction,
and 0.79 m (2.6 ft) NW of the edge of the sea wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 8771510 PUBLICATION DATE: 04/21/2003
Name: GALVESTON PLEASURE PIER, GULF OF MEXICO
TEXAS
NOAA Chart: 11324 Latitude: 29° 17.1' N
USGS Quad: GALVESTON Longitude: 94° 47.3' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 45 1975
DESIGNATION: 877 1510 TIDAL 45
MONUMENTATION: Tidal Station disk VM#: 860
AGENCY: National Ocean Survey (NOS) PID#: AW1247
SETTING CLASSIFICATION: Concrete sea wall
The bench mark is a disk set in the top center of the concrete sea wall, at the
junction of Seawall Boulevard and Moody Avenue (21st Street), across the
boulevard from the SE corner of Moody Center, 22.01 m (72.2 ft) east of a red
and yellow fire hydrant, 15.48 m (50.8 ft) SE of the center line of Seawall
Boulevard, 9.54 m (31.3 ft) SW of the SW corner of a planter with one palm tree,
and 0.79 m (2.6 ft) NW of the seaward side of the sea wall.
BENCH MARK STAMPING: NO 46 1975
DESIGNATION: 877 1510 TIDAL 46
MONUMENTATION: Tidal Station disk VM#: 861
AGENCY: National Ocean Survey (NOS) PID#: AW1703
SETTING CLASSIFICATION: Concrete sea wall
The bench mark is a disk set in the top of the sea wall, near the junction of
Seawall Boulevard and 18th Street, 15.03 m (49.3 ft) SE of the center line of
Seawall Boulevard, 3.17 m (10.4 ft) SW of the SW edge of a concrete bench along
the sea wall, and 0.79 m (2.6 ft) NW of the seaward side of the sea wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 8771510 PUBLICATION DATE: 04/21/2003
Name: GALVESTON PLEASURE PIER, GULF OF MEXICO
TEXAS
NOAA Chart: 11324 Latitude: 29° 17.1' N
USGS Quad: GALVESTON Longitude: 94° 47.3' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 47 1975
DESIGNATION: 877 1510 TIDAL 47
MONUMENTATION: Tidal Station disk VM#: 862
AGENCY: National Ocean Survey (NOS) PID#: AW1887
SETTING CLASSIFICATION: Concrete sea wall
The bench mark is a disk set in the top of the sea wall, at the junction of
Seawall Boulevard and 14th Street, 14.57 m (47.8 ft) SE of the centerline of
Seawall Boulevard, 2.10 m (6.9 ft) north of the NE side of steps leading to the
beach, and 0.85 m (2.8 ft) NW of the seaward side of the sea wall.
BENCH MARK STAMPING: S 449 5
DESIGNATION: S 449 5
MONUMENTATION: Survey disk VM#: 863
AGENCY: US Army Corps of Engineers (USE) PID#: AW4850
SETTING CLASSIFICATION: Concrete sea wall
The bench mark is a disk set in the top center of the concrete sea wall, at the
junction of Seawall Boulevard and 24th Street, 23.04 m (75.6 ft) NE of bench
mark NO 44 1957, 19.99 m (65.6 ft) NE of the NE ramp leading to the Flagship
Motor Hotel, 15.18 m (49.8 ft) SE of the centerline of Seawall Boulevard, 3.23
m (10.6 ft) west of the west side of steps leading to the beach, and 0.79 m (2.6
ft) north of the face of the sea wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 8771510 PUBLICATION DATE: 04/21/2003
Name: GALVESTON PLEASURE PIER, GULF OF MEXICO
TEXAS
NOAA Chart: 11324 Latitude: 29° 17.1' N
USGS Quad: GALVESTON Longitude: 94° 47.3' W
T I D A L D A T U M S
Tidal datums at GALVESTON PLEASURE PIER, GULF OF MEXICO based on:
LENGTH OF SERIES: 5 Years
TIME PERIOD: January 1997 - December 2001
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (09/11/1961) = 2.805
MEAN HIGHER HIGH WATER (MHHW) = 0.622
MEAN HIGH WATER (MHW) = 0.563
MEAN TIDE LEVEL (MTL) = 0.341
MEAN SEA LEVEL (MSL) = 0.338
NORTH AMERICAN VERTICAL DATUM-1988 (NAVD) = 0.186
MEAN LOW WATER (MLW) = 0.119
MEAN LOWER LOW WATER (MLLW) = 0.000
LOWEST OBSERVED WATER LEVEL (02/12/1985) = -1.487
National Geodetic Vertical Datum (NGVD 29)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 43 1957 7.539 6.976
WALL 1933 ELEV 15.279 FT 4.536 3.973
E 168 1936 ELEV 15.502 FT 4.586 4.023
WALL NO 1 1942 4.508 3.945
NO 44 1957 4.565 4.002
NO 10 1973 4.555 3.992
NO 45 1975 4.573 4.010
NO 46 1975 4.560 3.997
NO 47 1975 4.525 3.962
S 449 5 4.574 4.011
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 8771510 PUBLICATION DATE: 04/21/2003
Name: GALVESTON PLEASURE PIER, GULF OF MEXICO
TEXAS
NOAA Chart: 11324 Latitude: 29° 17.1' N
USGS Quad: GALVESTON Longitude: 94° 47.3' 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 the land in this 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
Level Observation Network (NWLON) using the last several years of sea level data
rather than the 19 - year tidal epoch. The tide ranges are still based on the
1983 - 2001 National Tidal Datum Epoch (NTDE) and are applied to the five year
(1997 - 2001) mean tide level (MTL) to compute other tidal datums. The adoption
of this procedure was necessary to ensure 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 8 of 8
Station ID: 8771510 PUBLICATION DATE: 04/21/2003
Name: GALVESTON PLEASURE PIER, GULF OF MEXICO
TEXAS
NOAA Chart: 11324 Latitude: 29° 17.1' N
USGS Quad: GALVESTON Longitude: 94° 47.3' 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 (NAVD 88).
NGVD 29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD 29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD 29 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 NGVD 29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD 88 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. NAVD 88 replaces NGVD 29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD 88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD 29 and NAVD 88 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 NAVD 88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD 88 elevations.
The NAVD 88 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, NAVD 88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD 88 elevations listed for
each bench mark in the NGS database.