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Datums Page Page 1 of 8
Station ID: 8779750 PUBLICATION DATE: 04/21/2003
Name: PADRE ISLAND, BRAZOS SANTIAGO PASS
TX
NOAA Chart: 11301 Latitude: 26° 4.1' N ( 26.06830)
USGS Quad: PORT ISABEL Longitude: 97° 9.4' W ( -97.15670)
To reach the tidal bench marks from the intersection of Queen Isabella Causeway
and Padre Boulevard (also known as Texas State Park Road 100) in South Padre
Island proceed SE on Padre Boulevard to the Isla Blanca Park complex. Continue
SE on the winding road to Jetties Restaurant and Lounge. The tide gauge sensor
and staff were located in the Pass and the bench marks were on the jetty, in the
Isla Blanca Park complex, and at the abandoned Texas Southmost College (former
U.S. Coast Guard Station).
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 2 1934
DESIGNATION: 2 USE
MONUMENTATION: Tidal Station disk VM#: 1700
AGENCY: US Army Corps of Engineers (USE) IDB PID#: AB1243
SETTING CLASSIFICATION: Rock jetty OPUS PID:
LATITUDE: 26° 4.1' N ( 26.06830) LONGITUDE: 97° 9.3' W ( -97.15500)
The primary bench mark is a disk set in the top and center of a rock jetty at
the south end of Padre Island, 38.70 m (127.0 ft) west of a 6x6 treated board
engraved with "MILE 0 MARKER", 20.73 m (68.0 ft) east of bench mark 1 1934, and
0.82 m (2.7 ft) north of the NW corner of the southernmost concrete block.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 8779750 PUBLICATION DATE: 04/21/2003
Name: PADRE ISLAND, BRAZOS SANTIAGO PASS
TX
NOAA Chart: 11301 Latitude: 26° 4.1' N ( 26.06830)
USGS Quad: PORT ISABEL Longitude: 97° 9.4' W ( -97.15670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1934 C-L 1+000
DESIGNATION: 877 9750 1934 C-L 1+000
MONUMENTATION: Tidal Station disk VM#: 1695
AGENCY: US Army Corps of Engineers (USE) IDB PID#:
SETTING CLASSIFICATION: Boulder OPUS PID:
LATITUDE: 26° 4.1' N ( 26.06830) LONGITUDE: 97° 9.4' W ( -97.15670)
The bench mark is a disk set in a granite boulder of a rock jetty located at the
south end of South Padre Island, 56 m (185 ft) SW of the SE corner of the
building housing restrooms, 52 m (171 ft) west of the south corner of the
Jetties Restaurant and Lounge building, 19 m (63 ft) NW of power pole #CPL
36-35, and about level with the top of the jetty.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 8779750 PUBLICATION DATE: 04/21/2003
Name: PADRE ISLAND, BRAZOS SANTIAGO PASS
TX
NOAA Chart: 11301 Latitude: 26° 4.1' N ( 26.06830)
USGS Quad: PORT ISABEL Longitude: 97° 9.4' W ( -97.15670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: N 1142 1959
DESIGNATION: N 1142
MONUMENTATION: Bench Mark disk VM#: 1696
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AB0258
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 26° 4.5' N ( 26.07500) LONGITUDE: 97° 9.9' W ( -97.16500)
The bench mark is a disk set in the top of a concrete foundation at the Texas
Southmost College (formerly the 1923 U.S. Coast Guard Station office building)
at the south end of South Padre Island, 8.53 m (28.0 ft) SW of the centerline of
the road around the building, 0.73 m (2.4 ft) north of the east corner of the
building, and 0.3 m (1 ft) above the ground.
BENCH MARK STAMPING: S 1406 1982
DESIGNATION: 877 9750 S 1406
MONUMENTATION: Metal Rod VM#: 1698
AGENCY: National Geodetic Survey (NGS) IDB PID#: AB1240
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 26° 4.2' N ( 26.07000) LONGITUDE: 97° 9.5' W ( -97.15830)
The bench mark is a metal rod located at the south end of South Padre Island in
the Isla Blanca Park complex near a large pavillion, 65 m (214 ft) east of the
centerline of the paved road at the entrance to the parking lot, 56 m (185 ft)
ESE of power pole #20, 41 m (134 ft) west of the SE corner of the patio at the
pavillion, and 1.83 m (6.0 ft) SW of the patio wall at the SW corner of the
pavillion. The datum point is set 0.15 m (0.5 ft) below ground surface, being
the top of the stainless steel rod in sleeve surrounded by a pipe with a
stamped access cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 8779750 PUBLICATION DATE: 04/21/2003
Name: PADRE ISLAND, BRAZOS SANTIAGO PASS
TX
NOAA Chart: 11301 Latitude: 26° 4.1' N ( 26.06830)
USGS Quad: PORT ISABEL Longitude: 97° 9.4' W ( -97.15670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1 1934
DESIGNATION: 1 USE
MONUMENTATION: Tidal Station disk VM#: 1699
AGENCY: US Army Corps of Engineers (USE) IDB PID#: AB1242
SETTING CLASSIFICATION: Rock jetty OPUS PID:
LATITUDE: 26° 4.1' N ( 26.06830) LONGITUDE: 97° 9.3' W ( -97.15500)
The bench mark is a disk set in the top and center of a rock jetty located at
the south end of Padre Island, 107 m (350 ft) SE of the SE corner of the Jetties
Restaurant and Lounge Building, and 11.80 m (38.7 ft) south of a 12-inch pile
with concrete chunk fastened to it.
BENCH MARK STAMPING: 3 1934
DESIGNATION: 3 USE
MONUMENTATION: Tidal Station disk VM#: 1701
AGENCY: US Army Corps of Engineers (USE) IDB PID#: AB1244
SETTING CLASSIFICATION: Rock jetty OPUS PID:
LATITUDE: 26° 4.1' N ( 26.06830) LONGITUDE: 97° 9.3' W ( -97.15500)
The bench mark is a disk set in the top and center of a rock jetty located at
the south end of Padre Island, 29.57 m (97.0 ft) east of bench mark 2 1934,
10.55 m (34.6 ft) SW of a 6x6 treated board engraved with "MILE 0 MARKER", and
0.15 m (0.5 ft) south of the south face of a concrete block.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 8779750 PUBLICATION DATE: 04/21/2003
Name: PADRE ISLAND, BRAZOS SANTIAGO PASS
TX
NOAA Chart: 11301 Latitude: 26° 4.1' N ( 26.06830)
USGS Quad: PORT ISABEL Longitude: 97° 9.4' W ( -97.15670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 5
DESIGNATION: 877 9750 TIDAL 5
MONUMENTATION: Bench Mark disk VM#: 1702
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AB1238
SETTING CLASSIFICATION: Concrete pavement OPUS PID:
LATITUDE: 26° 4.5' N ( 26.07500) LONGITUDE: 97° 9.7' W ( -97.16170)
The bench mark is a disk set in the concrete pavement of the Texas Southmost
College South Padre Island Branch Building (formerly the 1923 U.S. Coast Guard
Station office building) located at the south end of South Padre Island, 12.19 m
(40.0 ft) west of the road leading to the new Coast Guard building, 1.22 m (4.0
ft) west of the east line of the building, 0.61 m (2.0 ft) west of a set of
steps, 0.3 m (1 ft) south of the north line of the building, and about 0.61 m
(2.0 ft) above ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 8779750 PUBLICATION DATE: 04/21/2003
Name: PADRE ISLAND, BRAZOS SANTIAGO PASS
TX
NOAA Chart: 11301 Latitude: 26° 4.1' N ( 26.06830)
USGS Quad: PORT ISABEL Longitude: 97° 9.4' W ( -97.15670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0 1934
DESIGNATION: 0 USE
MONUMENTATION: Tidal Station disk VM#: 1817
AGENCY: US Army Corps of Engineers (USE) IDB PID#: AB1241
SETTING CLASSIFICATION: Rock jetty OPUS PID:
LATITUDE: 26° 4.1' N ( 26.06830) LONGITUDE: 97° 9.3' W ( -97.15500)
The bench mark is a disk set in the top and center of a rock jetty located at
the south end of Padre Island, 40.20 m (131.9 ft) WNW of bench mark 1 1934,
12.00 m (39.4 ft) SE of a concrete retaining wall, and 1.75 m (5.7 ft) NNW of a
15-inch concrete block.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 8779750 PUBLICATION DATE: 04/21/2003
Name: PADRE ISLAND, BRAZOS SANTIAGO PASS
TX
NOAA Chart: 11301 Latitude: 26° 4.1' N ( 26.06830)
USGS Quad: PORT ISABEL Longitude: 97° 9.4' W ( -97.15670)
T I D A L D A T U M S
Tidal datums at PADRE ISLAND, BRAZOS SANTIAGO PASS based on:
LENGTH OF SERIES: 4 Years
TIME PERIOD: March 1991 - February 1994
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8779770 PORT ISABEL, LAGUNA MADRE
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (09/20/1967) = 2.133
MEAN HIGHER HIGH WATER MHHW = 0.449
MEAN HIGH WATER MHW = 0.432
North American Vertical Datum NAVD88 = 0.274
MEAN SEA LEVEL MSL = 0.266
MEAN TIDE LEVEL MTL = 0.241
MEAN LOW WATER MLW = 0.050
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (12/13/1989) = -0.659
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
2 1934 1.615 1.183
1934 C-L 1+000 1.673 1.241
N 1142 1959 1.346 0.914
S 1406 1982 2.869 2.437
1 1934 1.701 1.269
3 1934 1.586 1.154
NO 5 1.342 0.910
0 1934 1.768 1.336
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 8779750 PUBLICATION DATE: 04/21/2003
Name: PADRE ISLAND, BRAZOS SANTIAGO PASS
TX
NOAA Chart: 11301 Latitude: 26° 4.1' N ( 26.06830)
USGS Quad: PORT ISABEL Longitude: 97° 9.4' W ( -97.15670)
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.