U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8761799 PUBLICATION DATE: 04/24/2018
Name: M.V. PETROLEUM DOCK, BAYOU ST DENIS
LA
NOAA Chart: 11358 Latitude: 29° 29.8' N ( 29.49670)
USGS Quad: BAY DOSGRIS Longitude: 90° 1.5' W ( -90.02500)
To reach the tidal bench marks by boat from Rigaud Marina at the east end of
Grand Isle, proceed north along Barataria Bay Waterway for 26 km (16 mi) to the
Manila Village Oil Field, then continue on the waterway for 1.6 km (1.0 mi) past
the oil field on the right, then veer left into Bayou St. Denis and follow the
channel into the dredged slip on the north side of the bayou to M.V. Petroleum
Dock. The bench marks are located along the spoil banks surrounding the slip
and clockwise around the slip from the dock. The tide gage and staff were
located on the NW side of the northernmost platform and concrete deck supporting
Storage Tank #52246 in the M.V. Petroleum Dock complex.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 1799 A 1985
DESIGNATION: 876 1799 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 7194
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 29.8' N ( 29.49670) LONGITUDE: 90° 1.5' W ( -90.02500)
The primary bench mark is a disk located SW of the storage tank platform on the
spoil bank, 23.62 m (77.5 ft) south of the west corner of the concrete platform
supporting Storage Tank # 52246, 20.27 m (66.5 ft) south of the south corner of
the concrete platform supporting Storage Tank # 52246, 9.02 m (29.6 ft) east of
a 2-inch square wood post standing 1 m (4 ft) above the marsh, and 0.40 m (1.3
ft) NNE of an NOS witness post. The bench mark is set 3 cm (0.1 ft) above
ground level, crimped to the top of a stainless steel rod driven 19.5 m (64 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 2 of 5
Station ID: 8761799 PUBLICATION DATE: 04/24/2018
Name: M.V. PETROLEUM DOCK, BAYOU ST DENIS
LA
NOAA Chart: 11358 Latitude: 29° 29.8' N ( 29.49670)
USGS Quad: BAY DOSGRIS Longitude: 90° 1.5' W ( -90.02500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1799 B 1985
DESIGNATION: 876 1799 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 7195
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 29.8' N ( 29.49670) LONGITUDE: 90° 1.5' W ( -90.02500)
The bench mark is a disk located 75.80 m (248.7 ft) NW of bench mark 1799 A
1985, 28.65 m (94.0 ft) west of a 3-pile cluster near the westernmost corner of
the slip, 17.22 m (56.5 ft) south of a 2-inch square wood post standing 1 m (4
ft) above the marsh, 9.75 m (32.0 ft) west of the slip bank at its NW corner,
and 0.64 m (2.1 ft) ENE of an NOS witness post. The bench mark is set 0.15 m
(0.5 ft) above ground level, crimped to the top of a stainless steel rod driven
21.9 m (72 ft) to substantial resistance, and encased in a 5-inch PVC pipe and
concrete kickblock.
BENCH MARK STAMPING: 1799 C 1985
DESIGNATION: 876 1799 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 7196
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 29.8' N ( 29.49670) LONGITUDE: 90° 1.5' W ( -90.02500)
The bench mark is a disk located 75.35 m (247.2 ft) north of bench mark 1799 B
1985, 36.45 m (119.6 ft) SW of a 2-inch square wood post standing 1 m (4 ft)
above the marsh, 21 m (70 ft) NNE of a 2-inch flowline originating at the well
head in the slip and crossing the spoil bank, 6.40 m (21.0 ft) NW of the bank of
the slip, and 0.46 m (1.5 ft) SE of an NOS witness post. The bench mark is set
12 cm (0.4 ft) above ground level, crimped to the top of a stainless steel rod
driven 20.7 m (68 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 3 of 5
Station ID: 8761799 PUBLICATION DATE: 04/24/2018
Name: M.V. PETROLEUM DOCK, BAYOU ST DENIS
LA
NOAA Chart: 11358 Latitude: 29° 29.8' N ( 29.49670)
USGS Quad: BAY DOSGRIS Longitude: 90° 1.5' W ( -90.02500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1799 D 1985
DESIGNATION: 876 1799 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 7197
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 29.8' N ( 29.49670) LONGITUDE: 90° 1.5' W ( -90.02500)
The bench mark is a disk located 75.35 m (247.2 ft) ESE of bench mark 1799 C
1985, 18.68 m (61.3 ft) NNW of the NW pile in a 4-pile pattern near the
northerly bank of the slip, 5.49 m (18.0 ft) NNE of the north bank of the slip,
and 0.49 m (1.6 ft) south of an NOS witness post. The bench mark is set 0.18 m
(0.6 ft) above ground level, crimped to the top of a stainless steel rod driven
23.2 m (76 ft) to substantial resistance, and encased in a 5-inch PVC pipe and
concrete kickblock.
BENCH MARK STAMPING: 1799 E 1985
DESIGNATION: 876 1799 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 7198
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 29.8' N ( 29.49670) LONGITUDE: 90° 1.5' W ( -90.02500)
The bench mark is a disk located 75.50 m (247.7 ft) ESE of bench mark 1799 D
1985, 19.69 m (64.6 ft) east of a point 5 m (15 ft) NNW of a pile of scrap pipe
on the bank of the slip, 11.19 m (36.7 ft) WSW of a 2-inch square wood post
standing 1 m (4 ft) above the marsh, and 0.3 m (1.0 ft) west of an NOS witness
post. The bench mark is set 9 cm (0.3 ft) above ground level, crimped to the
top of a stainless steel rod driven 21.9 m (72 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 4 of 5
Station ID: 8761799 PUBLICATION DATE: 04/24/2018
Name: M.V. PETROLEUM DOCK, BAYOU ST DENIS
LA
NOAA Chart: 11358 Latitude: 29° 29.8' N ( 29.49670)
USGS Quad: BAY DOSGRIS Longitude: 90° 1.5' W ( -90.02500)
T I D A L D A T U M S
Tidal datums at M.V. PETROLEUM DOCK, BAYOU ST DENIS based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: September 1985 - August 1986
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 (10/28/1985) = 1.356
MEAN HIGHER HIGH WATER MHHW = 0.228
MEAN HIGH WATER MHW = 0.228
MEAN SEA LEVEL MSL = 0.116
MEAN TIDE LEVEL MTL = 0.115
MEAN LOW WATER MLW = 0.002
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/27/1986) = -0.732
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
1799 A 1985 0.457 0.229
1799 B 1985 0.644 0.416
1799 C 1985 0.333 0.105
1799 D 1985 0.324 0.096
1799 E 1985 0.420 0.192
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8761799 PUBLICATION DATE: 04/24/2018
Name: M.V. PETROLEUM DOCK, BAYOU ST DENIS
LA
NOAA Chart: 11358 Latitude: 29° 29.8' N ( 29.49670)
USGS Quad: BAY DOSGRIS Longitude: 90° 1.5' W ( -90.02500)
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.