U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8770475 PUBLICATION DATE: 12/07/2020
Name: PORT ARTHUR, SABINE NACHES CANAL
TX
NOAA Chart: 11331 Latitude: 29° 52.0' N ( 29.86708)
USGS Quad: PORT ARTHUR SOUTH Longitude: 93° 55.9' W ( -93.93100)
To reach the station from the junction of state highways 82 and 87 near the
south edge of Port Arthur, go southeast for 3.46 km (2.15 miles) along highway
82 crossing the Martin Luther King bridge over the Sabine River to a T-junction
in the (T B Ellison Pkwy). Turn right, northeast, for 2.89 km (1.80 miles)
passing back under the bridge and along the parkway to the intersection of
(Pleaseure Pier Blvd). Turn left, northwest, 0.08 km (0.05 miles) to the Corps
of Engineers entrance road and gate on the left. To open gate, unlock the lock
with code 1807 and drive up to platform located on bulkhead. No prior
communication needed with Army Corps, and no PPE requirements.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: LUB 0475 B 1996
DESIGNATION: 877 0475 B
MONUMENTATION: Bench Mark disk VM#: 17577
AGENCY: Division of Nearshore Research (DNR) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBFG87
LATITUDE: 29° 52.0' N ( 29.86733) LONGITUDE: 93° 55.8' W ( -93.93047)
The bench mark is a brass disk set on the grounds of the Corps of Engineers
(COE) facility, 19.57 m (64.21 ft) SE of the fence along the NW side of the COE
property, 4.88 m (16.0 ft) NW of the centerline of the road and 0.37 m (1.2 ft)
south of the SW edge of a 3.7 m concrete foundation. The bench mark is recessed
10 cm (4 inches) below grade and crimped to the top of a stainless steel rod
driven to a depth of 16.8 m (55.1 ft) and encased in a 6-inch PVC pipe with a
concrete kick block.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8770475 PUBLICATION DATE: 12/07/2020
Name: PORT ARTHUR, SABINE NACHES CANAL
TX
NOAA Chart: 11331 Latitude: 29° 52.0' N ( 29.86708)
USGS Quad: PORT ARTHUR SOUTH Longitude: 93° 55.9' W ( -93.93100)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: LUB 0475 A 1996
DESIGNATION: 877 0475 A
MONUMENTATION: Bench Mark disk VM#: 17576
AGENCY: Division of Nearshore Research (DNR) IDB PID:
SETTING CLASSIFICATION: Set in pavement OPUS PID#: BBFY11
LATITUDE: 29° 52.0' N ( 29.86706) LONGITUDE: 93° 55.8' W ( -93.93072)
The bench mark is a disk set flush in the pavement located 57.7 (189.3 ft) SW of
the corner of a large enclosed United States Army Corps of Engineers (USACE)
barn, 24.59 m (80.7 ft) ESE) of the eastern pile of the tide station, 5.91 m
(19.4 ft) NNE of the bulkhead/boatslip for USACE vessels.
BENCH MARK STAMPING: LUB 0475 C 1996
DESIGNATION: 877 0475 C
MONUMENTATION: Bench Mark disk VM#: 17578
AGENCY: Division of Nearshore Research (DNR) IDB PID#: DN8102
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: DN8102
LATITUDE: 29° 52.1' N ( 29.86756) LONGITUDE: 93° 55.8' W ( -93.93011)
The bench mark is a brass disk set on the grounds of the Corps of Engineers
(COE) facility, 25.8 m (84.6 ft) north of the north corner of a metal building
with one garage door, 18.25 m (59.88 ft) WSW of the SW corner of a five door
yellow brick garage, 12.45 m (40.85 ft) NW of a sidewalk, and 0.8 m (2.6 ft) SE
the entry road curb. The bench mark is recessed 10 cm (4 inches) below grade
and crimped to the top of a stainless steel rod driven to an unknown depth and
encased in a 6-inch PVC pipe with a concrete kick block.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8770475 PUBLICATION DATE: 12/07/2020
Name: PORT ARTHUR, SABINE NACHES CANAL
TX
NOAA Chart: 11331 Latitude: 29° 52.0' N ( 29.86708)
USGS Quad: PORT ARTHUR SOUTH Longitude: 93° 55.9' W ( -93.93100)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: LUB 0475 D 1996
DESIGNATION: 877 0475 D
MONUMENTATION: Bench Mark disk VM#: 17579
AGENCY: Division of Nearshore Research (DNR) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 52.1' N ( 29.86800) LONGITUDE: 93° 55.8' W ( -93.93000)
The bench mark is a brass disk set on the grounds of the Corps of Engineers
(COE) facility, 43.28 m (142.0 ft) west of the center of the base of a flag
pole, 10.18 m (33.4 ft) SE of a fence along the NW side of the COE property and
1.22 m (4.0 ft) SE of the NW leg of a ROHN galvanized tower. The bench mark is
recessed 10 cm (4 inches) below grade and crimped to the top of a stainless
steel rod driven to a depth of 16.8 m (55.1 ft) and encased in a 6-inch PVC pipe
with a concrete kick block.
BENCH MARK STAMPING: LUB 0475 E 1996
DESIGNATION: 877 0475 E
MONUMENTATION: Bench Mark disk VM#: 17580
AGENCY: Division of Nearshore Research (DNR) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBFY09
LATITUDE: 29° 52.1' N ( 29.86808) LONGITUDE: 93° 55.8' W ( -93.92958)
The bench mark is a brass disk set on the grounds of the Corps of Engineers
(COE) facility, 14.05 m (46.1 ft) SW of a wood utility pole on the SE side of
the entrance gate, 7.0 m (23.0 ft) SE of the centerline of the entrance road,
and 0.98 m (3.2 ft) NW of the base of a flag pole. The bench mark is recessed
10 cm (4 inches) below grade and crimped to the top of a stainless steel rod
driven to a depth of 16.8 m (55.1 ft) and encased in a 6-inch PVC pipe with a
concrete kick block.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8770475 PUBLICATION DATE: 12/07/2020
Name: PORT ARTHUR, SABINE NACHES CANAL
TX
NOAA Chart: 11331 Latitude: 29° 52.0' N ( 29.86708)
USGS Quad: PORT ARTHUR SOUTH Longitude: 93° 55.9' W ( -93.93100)
T I D A L D A T U M S
Tidal datums at PORT ARTHUR, SABINE NACHES CANAL based on:
LENGTH OF SERIES: 3 YEARS
TIME PERIOD: August 2016 - July 2019
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8770822 TEXAS POINT, SABINE PASS
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (09/03/2017) = 1.453
MEAN HIGHER HIGH WATER MHHW = 0.317
MEAN HIGH WATER MHW = 0.302
MEAN SEA LEVEL MSL = 0.183
MEAN TIDE LEVEL MTL = 0.173
North American Vertical Datum NAVD88 = 0.113
MEAN LOW WATER MLW = 0.044
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (12/21/2018) = -0.653
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
LUB 0475 B 1996 2.368 2.066
LUB 0475 A 1996 1.288 0.986
LUB 0475 C 1996 2.659 2.357
LUB 0475 D 1996 2.751 2.449
LUB 0475 E 1996 2.632 2.330
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8770475 PUBLICATION DATE: 12/07/2020
Name: PORT ARTHUR, SABINE NACHES CANAL
TX
NOAA Chart: 11331 Latitude: 29° 52.0' N ( 29.86708)
USGS Quad: PORT ARTHUR SOUTH Longitude: 93° 55.9' W ( -93.93100)
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.