U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8761962 PUBLICATION DATE: 04/18/2018
Name: TEXACO GAS EXPLORATION DOCK, BAY RAMBO
LA
NOAA Chart: 11358 Latitude: 29° 21.7' N ( 29.36170)
USGS Quad: MINK BAYOU Longitude: 90° 8.4' W ( -90.14000)
To reach the tidal bench marks from Boudreauxs Waterfront Motel boat launch ramp
at Leeville, proceed by boat east in Southwestern Louisiana Canal to its east
end entrance at Caminada Bay, then proceed NE to the dredged channel in Bay
Tambour, then proceed NW along the channel to dual pipeline canals, then veer
left past the canals and follow the channel NW between islands to and through
Bay Rambo to an arm of the bay and the channel leading to Round Lake, then turn
right into a channel and proceed NE to a dredged canal on the left that leads to
the dredged slip of Texaco Gas Exploration Corporation Dock on the left. The
bench marks are on the west and south sides of the slip and along the SW shore
of Bay Rambo. The tide gage and staff were on the NW side of a small boat dock
on the SE end of a tank battery supporting four tanks.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 1962 A 1986
DESIGNATION: 876 1962 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 7210
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 21.7' N ( 29.36170) LONGITUDE: 90° 8.4' W ( -90.14000)
The primary bench mark is a disk located 18.38 m (60.3 ft) SSW of a timber pile
supporting the west corner of a small platform on the west side of the four tank
battery, 17.77 m (58.3 ft) SW of a 90 elbow of a 6-inch pipe extending out and
down from the small platform west of the four tank battery, and 0.76 m (2.5 ft)
NW of the west support pile under the seventh crossbeam supporting a number of
pipelines extending from the tank battery to a small pit. The bench mark is set
0.15 m (0.5 ft) above ground level, crimped to the top of a stainless steel rod
driven 24.4 m (80 ft) to substantial resistance, 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 2 of 5
Station ID: 8761962 PUBLICATION DATE: 04/18/2018
Name: TEXACO GAS EXPLORATION DOCK, BAY RAMBO
LA
NOAA Chart: 11358 Latitude: 29° 21.7' N ( 29.36170)
USGS Quad: MINK BAYOU Longitude: 90° 8.4' W ( -90.14000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1962 B 1986
DESIGNATION: 876 1962 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 7211
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 21.7' N ( 29.36170) LONGITUDE: 90° 8.4' W ( -90.14000)
The bench mark is a disk located 84.73 m (278.0 ft) SSE of bench mark 1962 A
1986, 12.80 m (42.0 ft) south of the west pile supporting a walkway crossbeam
and small metal light pole midway of the adjacent walkway, 5.64 m (18.5 ft) WSW
of the SW corner pile supporting the 90 corner in the walkway between the
compressor platform and heater platform, and 0.43 m (1.4 ft) NE of a witness
post. The bench mark is set 0.46 m (1.5 ft) above ground level, crimped to the
top of a stainless steel rod driven 24.4 m (80 ft) to substantial resistance,
and encased in a 5-inch PVC pipe extending 0.46 m (1.5 ft) above ground level.
BENCH MARK STAMPING: 1962 C 1986
DESIGNATION: 876 1962 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 7212
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 21.7' N ( 29.36170) LONGITUDE: 90° 8.4' W ( -90.14000)
The bench mark is a disk located 76.20 m (250.0 ft) east of bench mark 1962 B
1986, 38.65 m (126.8 ft) south of the SE corner support pile of the 90 corner
in the walkway between the office and compressor platform, 5.58 m (18.3 ft) ESE
of the SW corner support pile at a platform with three small tanks located west
of the compressor platform, and 0.21 m (0.7 ft) east of a witness post. The
bench mark is set 0.46 m (1.5 ft) above marsh level, crimped to the top of a
stainless steel rod driven 24.4 m (80 ft) to substantial resistance, and encased
in a 5-inch PVC pipe extending 0.61 m (2.0 ft) above marsh level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8761962 PUBLICATION DATE: 04/18/2018
Name: TEXACO GAS EXPLORATION DOCK, BAY RAMBO
LA
NOAA Chart: 11358 Latitude: 29° 21.7' N ( 29.36170)
USGS Quad: MINK BAYOU Longitude: 90° 8.4' W ( -90.14000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1962 D 1986
DESIGNATION: 876 1962 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 7213
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 21.7' N ( 29.36170) LONGITUDE: 90° 8.4' W ( -90.14000)
The bench mark is a disk located 76.20 m (250.0 ft) south of bench mark 1962 C
1986, 9.14 m (30.0 ft) SE of a cane pole driven into the marsh and extending 5 m
(15 ft) above marsh level, 7.62 m (25.0 ft) east of the descending bank of a
bayou, and 0.24 m (0.8 ft) east of a witness post. The bench mark is set 0.46 m
(1.5 ft) above marsh level, crimped to the top of a stainless steel rod driven
24.4 m (80 ft) to substantial resistance, and encased in a 5-inch PVC pipe
extending 0.61 m (2.0 ft) above marsh level.
BENCH MARK STAMPING: 1962 E 1986
DESIGNATION: 876 1962 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 7214
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 21.7' N ( 29.36170) LONGITUDE: 90° 8.4' W ( -90.14000)
The bench mark is a disk located 84.73 m (278.0 ft) SSE of bench mark 1962 D
1986, 7.62 m (25.0 ft) SE of a cane pole driven into the marsh and extending 5 m
(15 ft) above marsh level, 7.62 m (25.0 ft) SW of a cane pole driven into the
marsh and extending 5 m (15 ft) above the marsh, 1.83 m (6.0 ft) NE of the edge
of a small pond, and 0.34 m (1.1 ft) SE of a witness post. The bench mark is
set 0.46 m (1.5 ft) above marsh level, crimped to the top of a stainless steel
rod driven 24.4 m (80 ft) to substantial resistance, and encased in a 5-inch PVC
pipe extending 0.61 m (2.0 ft) above marsh level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8761962 PUBLICATION DATE: 04/18/2018
Name: TEXACO GAS EXPLORATION DOCK, BAY RAMBO
LA
NOAA Chart: 11358 Latitude: 29° 21.7' N ( 29.36170)
USGS Quad: MINK BAYOU Longitude: 90° 8.4' W ( -90.14000)
T I D A L D A T U M S
Tidal datums at TEXACO GAS EXPLORATION DOCK, BAY RAMBO based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: February 1987 - January 1988
TIDAL EPOCH: 2012-2016
CONTROL TIDE STATION: 8761724 GRAND ISLE, EAST POINT
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (03/24/1987) = 0.573
MEAN HIGHER HIGH WATER MHHW = 0.220
MEAN HIGH WATER MHW = 0.220
MEAN SEA LEVEL MSL = 0.115
MEAN TIDE LEVEL MTL = 0.110
MEAN LOW WATER MLW = 0.001
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (12/29/1987) = -0.622
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
1962 A 1986 0.295 0.075
1962 B 1986 0.491 0.271
1962 C 1986 0.467 0.247
1962 D 1986 0.435 0.215
1962 E 1986 0.379 0.159
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8761962 PUBLICATION DATE: 04/18/2018
Name: TEXACO GAS EXPLORATION DOCK, BAY RAMBO
LA
NOAA Chart: 11358 Latitude: 29° 21.7' N ( 29.36170)
USGS Quad: MINK BAYOU Longitude: 90° 8.4' W ( -90.14000)
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.