U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8770590 PUBLICATION DATE: 05/24/2012
Name: SABINE PASS
TX
NOAA Chart: 11342 Latitude: 29° 42.3' N ( 29.70500)
USGS Quad: TEXAS POINT Longitude: 93° 51.2' W ( -93.85330)
To reach the bench marks from the intersection of State Highway 87 and Texas
Farm Road 3322 in Sabine Pass, proceed SE and east on Texas Farm Road 3322 for
approximately 2.4 km (1.5 mi) to South 1st Avenue (7000 block), turn right and
proceed SE on South 1st Avenue for 3.2 km (2.0 mi) to a shell double driveway,
then turn left onto the shell driveway and proceed east for approximately 0.2 km
(0.1 mi) to a two story wood frame building (a former U.S. Coast Guard Station)
on concrete piles. The bench marks are located at the building and along the
two driveways. The tide gage was located on the north side of the building and
the staff was a block north of the building.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 2|2
DESIGNATION: 2/2=BM2
MONUMENTATION: Bench Mark disk VM#: 7285
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AV0454
SETTING CLASSIFICATION: Concrete filled pipe OPUS PID:
LATITUDE: 29° 42.4' N ( 29.70670) LONGITUDE: 93° 51.4' W ( -93.85670)
The primary bench mark is a disk set in the top of an 8-inch tile pipe filled
with concrete located north of the northern driveway, 52 m (170 ft) NE of the
centerline of the paved road, 47 m (154 ft) NE of bench mark NO 10 1975, 40 m
(131 ft) SW of the SW corner of the south concrete support post of the sign
stating "WARNING DO NOT ANCHOR OR DREDGE", 29 m (96 ft) north of the centerline
of the northern shell driveway, 1.5 m (5 ft) NW of a telephone pole, 0.3 m (1
ft) SE of a metal witness post, and 9 cm (0.3 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8770590 PUBLICATION DATE: 05/24/2012
Name: SABINE PASS
TX
NOAA Chart: 11342 Latitude: 29° 42.3' N ( 29.70500)
USGS Quad: TEXAS POINT Longitude: 93° 51.2' W ( -93.85330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 10 1975
DESIGNATION: 877 0590 TIDAL 10
ALIAS: 10
MONUMENTATION: Tidal Station disk VM#: 7284
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete post OPUS PID:
LATITUDE: 29° 42.3' N ( 29.70500) LONGITUDE: 93° 51.2' W ( -93.85330)
The bench mark is a disk set in the top of a concrete post, 17.56 m (57.6 ft)
north of the entrance driveway to the former U.S. Coast Station, 9.30 m (30.5
ft) east of the centerline of a paved road leading to Sabine Jetty, 2.62 m (8.6
ft) south of power pole #8404, and 0.24 m (0.8 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8770590 PUBLICATION DATE: 05/24/2012
Name: SABINE PASS
TX
NOAA Chart: 11342 Latitude: 29° 42.3' N ( 29.70500)
USGS Quad: TEXAS POINT Longitude: 93° 51.2' W ( -93.85330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3
DESIGNATION: BM 33=BM 3
MONUMENTATION: Bench Mark disk VM#: 7286
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AV0456
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 29° 42.4' N ( 29.70670) LONGITUDE: 93° 51.4' W ( -93.85670)
The bench mark is a disk set in the top of a concrete post at the entrance to
the former U.S. Coast Guard Station, 69 m (225 ft) NW of bench mark NO 4 1959,
20 m (65 ft) SE of bench mark 36+75 1200 CL, 14 m (45 ft) SE of the center line
of the road leading to the old coast guard station, 0.6 m (2 ft) west of a metal
witness post, and level with the ground.
BENCH MARK STAMPING: 36+75 1200 CL
DESIGNATION: 36+75 1200 CL USE=BM 5
ALIAS: 5
MONUMENTATION: Survey disk VM#: 7287
AGENCY: US Army Corps of Engineers (USE) IDB PID#: AV0455
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 29° 42.4' N ( 29.70670) LONGITUDE: 93° 51.4' W ( -93.85670)
The bench mark is a disk set in the top of a concrete post at the entrance to
the former U.S. Coast Guard Station, 23 m (76 ft) SSE of bench mark 2/2, 20 m
(65 ft) NW of bench mark 3, 5.8 m (19 ft) north of the centerline of the shell
driveway, and 0.9 m (3 ft) south of a metal witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8770590 PUBLICATION DATE: 05/24/2012
Name: SABINE PASS
TX
NOAA Chart: 11342 Latitude: 29° 42.3' N ( 29.70500)
USGS Quad: TEXAS POINT Longitude: 93° 51.2' W ( -93.85330)
T I D A L D A T U M S
Tidal datums at SABINE PASS based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: January 1978 - December 1978
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 (09/11/1961) = 2.187
MEAN HIGHER HIGH WATER MHHW = 0.566
MEAN HIGH WATER MHW = 0.534
MEAN SEA LEVEL MSL = 0.339
MEAN TIDE LEVEL MTL = 0.325
MEAN LOW WATER MLW = 0.116
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (02/25/1965) = -1.288
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
2|2 0.879 0.345
NO 10 1975 1.056 0.522
3 0.821 0.287
36+75 1200 CL 0.768 0.234
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8770590 PUBLICATION DATE: 05/24/2012
Name: SABINE PASS
TX
NOAA Chart: 11342 Latitude: 29° 42.3' N ( 29.70500)
USGS Quad: TEXAS POINT Longitude: 93° 51.2' W ( -93.85330)
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.