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Datums Page Page 1 of 14
Station ID: 8771510 PUBLICATION DATE: 10/20/2011
Name: GALVESTON PLEASURE PIER, GULF OF MEXICO
TX
NOAA Chart: 11324 Latitude: 29° 17.1' N ( 29.28530)
USGS Quad: GALVESTON Longitude: 94° 47.4' W ( -94.78940)
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) IDB PID#: AW0592
SETTING CLASSIFICATION: Concrete pier deck OPUS PID:
LATITUDE: 29° 17.0' N ( 29.28356) LONGITUDE: 94° 47.4' W ( -94.78917)
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 (0.20 mi) SE of the centerline of Sea
wall Boulevard, at a narrow drive between the Hotel and Fishing Pier parking
lots, 18.84 m (61.81 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 (1.21 ft) SW of the NE edge of the drive.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 14
Station ID: 8771510 PUBLICATION DATE: 10/20/2011
Name: GALVESTON PLEASURE PIER, GULF OF MEXICO
TX
NOAA Chart: 11324 Latitude: 29° 17.1' N ( 29.28530)
USGS Quad: GALVESTON Longitude: 94° 47.4' W ( -94.78940)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: WALL 1933 ELEV 15.279 FT
DESIGNATION: WALL
ALIAS: Wall 1933
MONUMENTATION: Triangulation Station disk VM#: 855
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AW0588
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 29° 17.9' N ( 29.29778) LONGITUDE: 94° 46.7' W ( -94.77806)
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 (35.79 ft) SW of the west
corner of concrete bench, 0.79 m (2.59 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 3 of 14
Station ID: 8771510 PUBLICATION DATE: 10/20/2011
Name: GALVESTON PLEASURE PIER, GULF OF MEXICO
TX
NOAA Chart: 11324 Latitude: 29° 17.1' N ( 29.28530)
USGS Quad: GALVESTON Longitude: 94° 47.4' W ( -94.78940)
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
ALIAS: E 168
MONUMENTATION: Tidal Station disk VM#: 856
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AW0590
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 29° 17.4' N ( 29.28917) LONGITUDE: 94° 47.3' W ( -94.78889)
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 (342.2 ft) SW of the junction of
Sea wall Boulevard and 23rd Street North across the boulevard from Playland
Park, 21.18 m (69.49 ft) NE of the NE end of a concrete bench, 8.47 m (27.79 ft)
SW of the south corner of a concrete block planter with two palm trees, 5.43 m
(17.81 ft) SE of the SE curb of the boulevard, 0.94 m (3.08 ft) north of the NW
end of a pipe handrail along steps leading to the beach, and about 0.3 m (1.0
ft) higher than the boulevard.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 14
Station ID: 8771510 PUBLICATION DATE: 10/20/2011
Name: GALVESTON PLEASURE PIER, GULF OF MEXICO
TX
NOAA Chart: 11324 Latitude: 29° 17.1' N ( 29.28530)
USGS Quad: GALVESTON Longitude: 94° 47.4' W ( -94.78940)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: WALL NO 1 1942
DESIGNATION: WALL RM 1
ALIAS: Wall NO 1 1942
MONUMENTATION: Reference Mark disk VM#: 857
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AW0589
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 29° 15.9' N ( 29.26417) LONGITUDE: 94° 46.7' W ( -94.77778)
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 (46.69 ft) NE of
the station, 1.71 m (5.61ft) NE of the east corner of a conctete bench, 1.19 m
(3.90 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 5 of 14
Station ID: 8771510 PUBLICATION DATE: 10/20/2011
Name: GALVESTON PLEASURE PIER, GULF OF MEXICO
TX
NOAA Chart: 11324 Latitude: 29° 17.1' N ( 29.28530)
USGS Quad: GALVESTON Longitude: 94° 47.4' W ( -94.78940)
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
ALIAS: NO 44
MONUMENTATION: Tidal Station disk VM#: 858
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AW0591
SETTING CLASSIFICATION: Concrete seawall OPUS PID:
LATITUDE: 29° 17.3' N ( 29.28833) LONGITUDE: 94° 47.4' W ( -94.79028)
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
(9.8 ft) SW of the centerline of a concrete ramp leading down to the beach, 0.88
m (2.89 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 (2.30 ft) north of the NE corner
of a chain link fence around the Flagship Motor Hotel, and about 0.61m (2.0 ft)
higher than the boulevard.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 14
Station ID: 8771510 PUBLICATION DATE: 10/20/2011
Name: GALVESTON PLEASURE PIER, GULF OF MEXICO
TX
NOAA Chart: 11324 Latitude: 29° 17.1' N ( 29.28530)
USGS Quad: GALVESTON Longitude: 94° 47.4' W ( -94.78940)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: BM NO 10 1973
DESIGNATION: 877 1510 TIDAL 10
ALIAS: BM NO 10
MONUMENTATION: Tidal Station disk VM#: 859
AGENCY: National Ocean Survey (NOS) IDB PID#: AW1221
SETTING CLASSIFICATION: Concrete seawall OPUS PID:
LATITUDE: 29° 17.4' N ( 29.29000) LONGITUDE: 94° 47.3' W ( -94.78861)
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 (56.693 ft) ESE of
the centerline of Seawall Boulevard, 7.50 m (24.61 ft) SW of steps leading to
the beach at the foot of Tremont Street, and 0.79 m (2.59 ft) NW of the edge of
the sea wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 14
Station ID: 8771510 PUBLICATION DATE: 10/20/2011
Name: GALVESTON PLEASURE PIER, GULF OF MEXICO
TX
NOAA Chart: 11324 Latitude: 29° 17.1' N ( 29.28530)
USGS Quad: GALVESTON Longitude: 94° 47.4' W ( -94.78940)
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
ALIAS: NO 45
MONUMENTATION: Tidal Station disk VM#: 860
AGENCY: National Ocean Survey (NOS) IDB PID#: AW1247
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 29° 17.5' N ( 29.29111) LONGITUDE: 94° 47.2' W ( -94.78639)
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 (72.21 ft) east of a red
and yellow fire hydrant, 15.48 m (50.79 ft) SE of the centerline of Seawall
Boulevard, 9.54 m (31.30 ft) SW of the SW corner of a planter with one palm
tree, and 0.79 m (2.59 ft) NW of the seaward side of the sea wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 14
Station ID: 8771510 PUBLICATION DATE: 10/20/2011
Name: GALVESTON PLEASURE PIER, GULF OF MEXICO
TX
NOAA Chart: 11324 Latitude: 29° 17.1' N ( 29.28530)
USGS Quad: GALVESTON Longitude: 94° 47.4' W ( -94.78940)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 46 1975
DESIGNATION: 877 1510 TIDAL 46
ALIAS: NO 46
MONUMENTATION: Tidal Station disk VM#: 861
AGENCY: National Ocean Survey (NOS) IDB PID#: AW1703
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 29° 17.6' N ( 29.29333) LONGITUDE: 94° 47.0' W ( -94.78361)
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 (49.31 ft) SE of the centerline of
Seawall Boulevard, 3.17 m (10.40 ft) SW of the SW edge of a concrete bench along
the sea wall, and 0.79 m (2.59 ft) NW of the seaward side of the sea wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 9 of 14
Station ID: 8771510 PUBLICATION DATE: 10/20/2011
Name: GALVESTON PLEASURE PIER, GULF OF MEXICO
TX
NOAA Chart: 11324 Latitude: 29° 17.1' N ( 29.28530)
USGS Quad: GALVESTON Longitude: 94° 47.4' W ( -94.78940)
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
ALIAS: NO 47
MONUMENTATION: Tidal Station disk VM#: 862
AGENCY: National Ocean Survey (NOS) IDB PID#: AW1887
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 29° 17.6' N ( 29.29333) LONGITUDE: 94° 46.0' W ( -94.76694)
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 (47.80 ft) SE of the centerline of
Seawall Boulevard, 2.10 m (6.89 ft) north of the NE side of steps leading to the
beach, and 0.85 m (2.79 ft) NW of the seaward side of the sea wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 10 of 14
Station ID: 8771510 PUBLICATION DATE: 10/20/2011
Name: GALVESTON PLEASURE PIER, GULF OF MEXICO
TX
NOAA Chart: 11324 Latitude: 29° 17.1' N ( 29.28530)
USGS Quad: GALVESTON Longitude: 94° 47.4' W ( -94.78940)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: S 449 5
DESIGNATION: S 449 5
ALIAS: NO 5
MONUMENTATION: Tidal Station disk VM#: 863
AGENCY: US Army Corps of Engineers (USE) IDB PID#: AW4850
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 29° 17.3' N ( 29.28833) LONGITUDE: 94° 47.4' W ( -94.78972)
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 (75.59 ft) NE of bench
mark NO 44 1957, 19.99 m (65.58 ft) NE of the NE ramp leading to the Flagship
Motor Hotel, 15.18 m (49.80 ft) SE of the centerline of Seawall Boulevard, and
3.23 m (10.60 ft) west of the west side of steps leading to the beach.
BENCH MARK STAMPING: 1510 A 2002
DESIGNATION: 877 1510 A TIDAL
ALIAS: 1510 A
MONUMENTATION: Metal Rod VM#: 17360
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 17.4' N ( 29.28944) LONGITUDE: 94° 47.3' W ( -94.78889)
The bench mark is a metal rod located near the corner of Seawall Boulevard and
23rd Street, on the property of the Comfort Inn Motel at 2300 Seawall Boulevard,
47.61 m (156.2 ft) WSW of a fire hydrant on the corner of Seawall Boulevard and
23rd Street, 5.52 m (18.11 ft) NNW of the Seawall Boulevard curb, and 0.38 m
(1.25 ft) SSE of the southwesternmost flag pole in a series of three flag poles.
The datum point is set 16 cm (0.5 m) below grade, being the top of a stainless
steel rod driven 15.3 m (50.2 ft) to substantial resistance, and encased in a
6-inch PVC pipe with NOS logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 11 of 14
Station ID: 8771510 PUBLICATION DATE: 10/20/2011
Name: GALVESTON PLEASURE PIER, GULF OF MEXICO
TX
NOAA Chart: 11324 Latitude: 29° 17.1' N ( 29.28530)
USGS Quad: GALVESTON Longitude: 94° 47.4' W ( -94.78940)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1510 B 2006
DESIGNATION: 877 1510 B TIDAL
ALIAS: 877 1510 B TIDAL
MONUMENTATION: Metal Rod VM#: 19455
AGENCY: Texas DNR IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 17.4' N ( 29.29056) LONGITUDE: 94° 47.3' W ( -94.78778)
The bench mark is a metal rod located near the corner of Seawall Blvd. and 22nd
St, located 6.34 m (20.80 ft) WSW of the light pole "315882", 30.64 m (100.52
ft) SW of the centerline of Kempner St., 7.57 m (24.84 ft) SE of the middle of
the trolley tracks on Seawall Blvd. The bench mark is 0.75 m (2.46 ft) east of
the metal delivery entrance gate.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 12 of 14
Station ID: 8771510 PUBLICATION DATE: 10/20/2011
Name: GALVESTON PLEASURE PIER, GULF OF MEXICO
TX
NOAA Chart: 11324 Latitude: 29° 17.1' N ( 29.28530)
USGS Quad: GALVESTON Longitude: 94° 47.4' W ( -94.78940)
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 (09/13/2008) = 3.447
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 NAVD88 = 0.186
MEAN LOW WATER MLW = 0.119
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (02/12/1985) = -1.487
North American Vertical Datum (NAVD88)
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 4.582 4.019
WALL NO 1 1942 4.509 3.946
NO 44 1957 4.559 3.996
BM NO 10 1973 4.554 3.991
NO 45 1975 4.571 4.008
NO 46 1975 4.559 3.996
NO 47 1975 4.529 3.966
S 449 5 4.568 4.005
1510 A 2002 5.099 4.536
1510 B 2006 4.835 4.272
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 13 of 14
Station ID: 8771510 PUBLICATION DATE: 10/20/2011
Name: GALVESTON PLEASURE PIER, GULF OF MEXICO
TX
NOAA Chart: 11324 Latitude: 29° 17.1' N ( 29.28530)
USGS Quad: GALVESTON Longitude: 94° 47.4' W ( -94.78940)
Foot Notes:
Bench mark 1510 B 2006 is based on one differential leveling connection and do
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 14 of 14
Station ID: 8771510 PUBLICATION DATE: 10/20/2011
Name: GALVESTON PLEASURE PIER, GULF OF MEXICO
TX
NOAA Chart: 11324 Latitude: 29° 17.1' N ( 29.28530)
USGS Quad: GALVESTON Longitude: 94° 47.4' W ( -94.78940)
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.