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Datums Page Page 1 of 10
Station ID: 8770570 PUBLICATION DATE: 09/27/2011
Name: SABINE PASS NORTH
TX
NOAA Chart: 11342 Latitude: 29° 43.7' N ( 29.72840)
USGS Quad: TEXAS POINT Longitude: 93° 52.2' W ( -93.87010)
To reach the tidal bench marks from the intersection of Texas Highway 87
(Broadway) and Texas Farm Road 3322 (Dowling Road) in Sabine Pass, proceed east
on Farm Road 3322 for 2.4 km (1.5 mi) to South First Avenue (7000 block), turn
right on South First Avenue and go 0.2 km (0.10 mi) to the U.S. Coast Guard
Station. The bench marks are located inside the U.S. Coast Guard compound and
at the entrance to the compound. The tide gauge was located on the inside
corner of the L shaped pier.
T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 10
Station ID: 8770570 PUBLICATION DATE: 09/27/2011
Name: SABINE PASS NORTH
TX
NOAA Chart: 11342 Latitude: 29° 43.7' N ( 29.72840)
USGS Quad: TEXAS POINT Longitude: 93° 52.2' W ( -93.87010)
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 0570 A 1985
DESIGNATION: 877 0570 A TIDAL
ALIAS: 0570 A
MONUMENTATION: Bench Mark disk VM#: 1572
AGENCY: National Ocean Service (NOS) IDB PID#: AV1014
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: AV1014
LATITUDE: 29° 43.8' N ( 29.72953) LONGITUDE: 93° 52.3' W ( -93.87136)
The primary bench mark is a disk set in the corner of the U.S. Coast Guard
compound near the gate to the L shaped pier, 20.97 m (68.80 ft) NE of the north
corner of the barracks, 16.61 m (54.49 ft) SW of the sheet pile bulkhead, 4.21 m
(13.81ft) SW of the center of the road, 2.80 m (9.19 ft) south of the SW gate
post of the gate to the pier, 1.01 m (3.31 ft) NE of a power pole with a street
light, and 1.01 m (3.31 ft) SE from a fiberglass witness post in a chain link
fence. The bench mark is set 15.2 cm (0.49 ft) below the ground, crimped to the
top of a stainless steel rod driven 18.3 m (60.0 ft) to refusal, and encased in
a 4-inch PVC pipe surrounded by concrete.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 10
Station ID: 8770570 PUBLICATION DATE: 09/27/2011
Name: SABINE PASS NORTH
TX
NOAA Chart: 11342 Latitude: 29° 43.7' N ( 29.72840)
USGS Quad: TEXAS POINT Longitude: 93° 52.2' W ( -93.87010)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: F 1015 1953
DESIGNATION: F 1015
ALIAS: F 1015
MONUMENTATION: Bench Mark disk VM#: 1571
AGENCY: National Ocean Survey/Service (NOS) IDB PID#: AV0446
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 29° 43.7' N ( 29.72856) LONGITUDE: 93° 52.4' W ( -93.87306)
The bench mark is a disk set flush in the top of the west corner of a concrete
guy wire anchor on the east side of South First Avenue, 46.0 m (150.9 ft) north
of the centerline of the entrance road to the U.S. Coast Guard Station, 16.15 m
(52.99 ft) NE of the centerline of South First Avenue, 4.05 m (13.29 ft) SSE of
Power Pole No. 894, 3.26 m (10.70 ft) NW of an underground cable box No. 22,
2.32 m (7.61 ft) SW of the chain link fence, and 0.30 m (0.98 ft) above ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 10
Station ID: 8770570 PUBLICATION DATE: 09/27/2011
Name: SABINE PASS NORTH
TX
NOAA Chart: 11342 Latitude: 29° 43.7' N ( 29.72840)
USGS Quad: TEXAS POINT Longitude: 93° 52.2' W ( -93.87010)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0570 C 1985
DESIGNATION: 877 0570 C
ALIAS: 0570 C
MONUMENTATION: Tidal Station disk VM#: 1573
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 43.7' N ( 29.72867) LONGITUDE: 93° 52.3' W ( -93.87186)
The bench mark is a disk set on the SE side of the entrance road to the U.S.
Coast Guard Station, near the NW side of the Sewage Treatment Tank, 11.64 m
(38.19 ft) NW of the west corner of the pump house, 7.32 m (24.02 ft) SE of the
centerline of the entrance road to the station, 5.8 m (19.0 ft) NW of a water
spigot, and 0.94 m (3.08 ft) NE of a power pole with a light. The bench mark is
set 6 cm (0.19 ft) below ground level, crimped to a stainless steel rod driven
14.6 m (47.9 ft) to refusal, and encased in a 5-inch PVC pipe and concrete
kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 10
Station ID: 8770570 PUBLICATION DATE: 09/27/2011
Name: SABINE PASS NORTH
TX
NOAA Chart: 11342 Latitude: 29° 43.7' N ( 29.72840)
USGS Quad: TEXAS POINT Longitude: 93° 52.2' W ( -93.87010)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0570 D 1985
DESIGNATION: 877 0570 D
ALIAS: 0570 D
MONUMENTATION: Tidal Station disk VM#: 1574
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete manhole foundation OPUS PID:
LATITUDE: 29° 43.7' N ( 29.72886) LONGITUDE: 93° 52.3' W ( -93.87242)
The bench mark is a disk set flush in the south corner of a concrete foundation
of a manhole cover in the north corner of the U.S. Coast Guard Reserve Area at
the U.S. Coast Guard Station, 39.6 m (129.9 ft) NW of the centerline of the
entrance road, 24.3 m (79.7 ft) NE of the north corner of U.S. Coast Guard
reserve building E, 3.7 m (12.1 ft) south of the chain link fence line running
SW, 1.4 m (4.6 ft) west of the chain link fence line running SE, and 12.2 cm
above ground level.
BENCH MARK STAMPING: 0570 E 1990
DESIGNATION: 877 0570 E
MONUMENTATION: Tidal Station disk VM#: 1575
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 43.9' N ( 29.73111) LONGITUDE: 93° 52.5' W ( -93.87500)
The bench mark is a disk set 0.8 km (0.5 mi) NW of the U.S. Coast Guard Station
at Sabine Pass, 118 m (387.1 ft) WSW of a Texas State flag pole, 14.17 m (46.49
ft) west of the most southerly of two CSU Company underground water main
markers, 4.72 m (15.49 ft) NNW of the centerline of the park entrance road, and
2.13 m (6.99 ft) NNE of the most southerly pole of the most northerly of two
gate supports. The bench mark is set 6 cm (0.19 ft) below ground level, crimped
to the top of a stainless steel rod driven 15.8 m (51.8 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 6 of 10
Station ID: 8770570 PUBLICATION DATE: 09/27/2011
Name: SABINE PASS NORTH
TX
NOAA Chart: 11342 Latitude: 29° 43.7' N ( 29.72840)
USGS Quad: TEXAS POINT Longitude: 93° 52.2' W ( -93.87010)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0570 F 1990
DESIGNATION: 877 0570 F
ALIAS: 0570 F
MONUMENTATION: Tidal Station disk VM#: 1576
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete bunker OPUS PID:
LATITUDE: 29° 43.8' N ( 29.72953) LONGITUDE: 93° 52.5' W ( -93.87442)
The bench mark is a disk set flush in the top of the south wingwall of the
northwestern most of four bunkers in a park, located pproximately 1.0 km (0.60
mi) NW of the U.S. Coast Guard Station at Sabine Pass, 64.62 m (212.0 ft) SW of
the SW face of the most northeasternly of four bunkers, 41.76 m (137.01 ft) NE
of the centerline of the park road leading to a picnic area, 2.44 m (8.01 ft)
south of the centerline of the entrance road leading to the bunker storage
doors, with witness post 1.25 m (4.10 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 10
Station ID: 8770570 PUBLICATION DATE: 09/27/2011
Name: SABINE PASS NORTH
TX
NOAA Chart: 11342 Latitude: 29° 43.7' N ( 29.72840)
USGS Quad: TEXAS POINT Longitude: 93° 52.2' W ( -93.87010)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0570 G 1993
DESIGNATION: 877 0570 G
ALIAS: 0570 G 1993
MONUMENTATION: Tidal Station disk VM#: 3950
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 43.7' N ( 29.72889) LONGITUDE: 93° 52.5' W ( -93.87492)
The bench mark is a disk set NE of the road leading to the Sabine Pass
Battleground Park, 37.49 m (123.00 ft) NW of the centerline of Park Road and
3.96 m (12.99 ft) east of the most easternly sign post to the battleground. The
bench mark is flush with the ground, crimped to a stainless steel rod driven
15.8 m (51.8 ft) to refusal, and encased in a 5-inch PVC pipe with a concrete
kickblock.
BENCH MARK STAMPING: 0570 H 1993
DESIGNATION: 877 0570 H
MONUMENTATION: Tidal Station disk VM#: 3951
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 43.8' N ( 29.73006) LONGITUDE: 93° 52.6' W ( -93.87603)
The bench mark is a disk set in the Sabine Pass Battleground Park, just before
the curve in the road leading into the park, 8.4 m (27.6 ft) NE of a green and
white fire hydrant, 5.73 m (18.7 ft) WSW of the centerline of the park road, and
2.2 m (7.2 ft) WSW of the edge of the road. The bench mark is crimped to a
stainless steel rod driven 15.8 m (51.8 ft) to refusal, and encased in a 5-inch
PVC pipe and surrounded by a concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 10
Station ID: 8770570 PUBLICATION DATE: 09/27/2011
Name: SABINE PASS NORTH
TX
NOAA Chart: 11342 Latitude: 29° 43.7' N ( 29.72840)
USGS Quad: TEXAS POINT Longitude: 93° 52.2' W ( -93.87010)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0570 J 2002
DESIGNATION: 877 0570 J TIDAL
MONUMENTATION: Flange-encased Rod VM#: 17374
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 43.7' N ( 29.72806) LONGITUDE: 93° 52.2' W ( -93.87064)
The bench mark is a flange-encased rod located on the US Coast Guard Property,
20.4 m (66.9 ft) east of the northeasternmost corner of the patrol boat office,
17.49 m (57.4 ft) NE of the NE corner of a blue colored Cathodic protection box,
8.81 m (28.9 ft) SSE of the centerline of the ramp leading to the new boat pier,
and 0.64 m (2.10 ft) west of the edge of a steel bulkhead immediately south of
the pier. The datum point is the top of a stainless steel rod driven 15.24 m
(50.00 ft) to substantial resistance and encased in a 6-inch PVC pipe with
concrete kickblock.
BENCH MARK STAMPING: 0570 K 2002
DESIGNATION: 877 0570 K TIDAL
MONUMENTATION: Flange-encased Rod VM#: 17375
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 43.7' N ( 29.72881) LONGITUDE: 93° 52.3' W ( -93.87089)
The bench mark is a flange-encased rod located on the US Coast Guard Station,
Sabine Pass property, 21.08 m (69.16 ft) north of the northeasternmost corner of
the flag tower, 20.6 m (67.6 ft) east of the northeasternmost corner of USCG
headquarters, 16.5 m (54.1ft) SSW of the SW corner of the Coast Guard weight
room building, and 0.40 m (1.3 ft) WSW of an old wood abutement running parallel
to the bulkhead next to Sabine pass and in between the new and old boat piers.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 9 of 10
Station ID: 8770570 PUBLICATION DATE: 09/27/2011
Name: SABINE PASS NORTH
TX
NOAA Chart: 11342 Latitude: 29° 43.7' N ( 29.72840)
USGS Quad: TEXAS POINT Longitude: 93° 52.2' W ( -93.87010)
T I D A L D A T U M S
Tidal datums at SABINE PASS NORTH based on:
LENGTH OF SERIES: 17 YEARS
TIME PERIOD: January 1985 - December 2001
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 (09/13/2008) = 4.362
MEAN HIGHER HIGH WATER MHHW = 0.488
MEAN HIGH WATER MHW = 0.457
MEAN SEA LEVEL MSL = 0.293
MEAN TIDE LEVEL MTL = 0.291
MEAN LOW WATER MLW = 0.124
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/19/1996) = -1.142
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
0570 A 1985 2.214 1.757
F 1015 1953 1.891 1.434
0570 C 1985 2.898 2.441
0570 D 1985 2.745 2.288
0570 E 1990 1.002 0.545
0570 F 1990 2.930 2.473
0570 G 1993 1.271 0.814
0570 H 1993 0.900 0.443
0570 J 2002 2.461 2.004
0570 K 2002 2.425 1.968
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 10 of 10
Station ID: 8770570 PUBLICATION DATE: 09/27/2011
Name: SABINE PASS NORTH
TX
NOAA Chart: 11342 Latitude: 29° 43.7' N ( 29.72840)
USGS Quad: TEXAS POINT Longitude: 93° 52.2' W ( -93.87010)
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.