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National Ocean Service
Datums Page Page 1 of 9
Station ID: 8761899 PUBLICATION DATE: 04/09/2018
Name: LAFITTE, BARATARIA WATERWAY
LA
NOAA Chart: 11352 Latitude: 29° 40.0' N ( 29.66670)
USGS Quad: LAFITTE Longitude: 90° 6.7' W ( -90.11170)
To reach the tidal bench marks from Lapalco Boulevard in Gretna, proceed south
on State Highway 3134 to the intersection with State Highway 45, then turn right
and proceed south on State Highway 45 to Lower Lafitte, then turn right on 3rd
Street and proceed west to M.D. Hughes Wharf behind Lower Lafitte Playground.
The bench marks are in the vicinity of the playround and along the surrounding
roads. The tide gage and staff are located at the NW corner of the M.D. Hughes
Wharf.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 1899 A 1985
DESIGNATION: 876 1899 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 11048
AGENCY: National Ocean Service (NOS) IDB PID#: AU2311
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 29° 40.0' N ( 29.66670) LONGITUDE: 90° 6.7' W ( -90.11170)
The primary bench mark is a disk set flush in a concrete foundation for a small
pumping station north of the playground, 49 m (161 ft) NE of the tide staff,
20.27 m (66.5 ft) SSE of the SW corner of a small white house, 5.30 m (17.4 ft)
north of the edge of a large cylindrical concrete slab, 1.89 m (6.2 ft) ENE of a
guy wire anchor for a light pole, and 0.24 m (0.8 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 9
Station ID: 8761899 PUBLICATION DATE: 04/09/2018
Name: LAFITTE, BARATARIA WATERWAY
LA
NOAA Chart: 11352 Latitude: 29° 40.0' N ( 29.66670)
USGS Quad: LAFITTE Longitude: 90° 6.7' W ( -90.11170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1899 B 1985
DESIGNATION: 876 1899 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 11049
AGENCY: National Ocean Service (NOS) IDB PID#: AU2310
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 40.1' N ( 29.66830) LONGITUDE: 90° 6.7' W ( -90.11170)
The bench mark is a disk located on Marrero Street near the NE corner of the
basketball court, 72.24 m (237.0 ft) SE of bench mark 1899 A 1985, 19.20 m (63.0
ft) NNE of the SE corner of the chain link fence surrounding the basketball
courts, 17 m (57 ft) WSW of a power pole on the east side of Marrero Street,
said pole bearing street signs for Marrero and 3rd Street, 12.92 m (42.4 ft) NE
of the eastern-most basketball goal post, 10 m (33 ft) west of the centerline of
Marrero Street, and 0.46 m (1.5 ft) west of the standard NOS witness post. The
bench mark is set 12 cm (0.4 ft) below 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 3 of 9
Station ID: 8761899 PUBLICATION DATE: 04/09/2018
Name: LAFITTE, BARATARIA WATERWAY
LA
NOAA Chart: 11352 Latitude: 29° 40.0' N ( 29.66670)
USGS Quad: LAFITTE Longitude: 90° 6.7' W ( -90.11170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1899 C 1985
DESIGNATION: 876 1899 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 11050
AGENCY: National Ocean Service (NOS) IDB PID#: AU2312
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 40.1' N ( 29.66830) LONGITUDE: 90° 6.7' W ( -90.11170)
The bench mark is a disk located on the east side of Marrero Street, about
midway between the playground and Louisiana Highway 45, 64 m (210 ft) NNE of
bench mark 1899 B 1985, 13.84 m (45.4 ft) north of Power Pole No. 161 S on the
east side of Marrero Street, 5.64 m (18.5 ft) SSE of the west side of a concrete
culvert under a shell driveway to a vacant lot, 5.21 m (17.1 ft) east of the
east edge of paving of Marrero Street, and 0.58 m (1.9 ft) east of the standard
NOS witness post. The bench mark is set 6 cm (0.2 ft) below ground level,
crimped to the top of a stainless steel rod driven 18.3 m (60 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 9
Station ID: 8761899 PUBLICATION DATE: 04/09/2018
Name: LAFITTE, BARATARIA WATERWAY
LA
NOAA Chart: 11352 Latitude: 29° 40.0' N ( 29.66670)
USGS Quad: LAFITTE Longitude: 90° 6.7' W ( -90.11170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1899 D 1985
DESIGNATION: 876 1899 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 11051
AGENCY: National Ocean Service (NOS) IDB PID#: AU2313
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 40.1' N ( 29.66830) LONGITUDE: 90° 6.5' W ( -90.10830)
The bench mark is a disk located on the SW corner of the intersection of Fisher
Street and Louisiana Highway 45, 153.50 m (503.6 ft) east of bench mark Lafitte
1934, 20.57 m (67.5 ft) ENE of a water meter next to a gas meter in front of a
small wood frame house o the SW corner of the intersection, 11.13 m (36.5 ft)
south of power pole No. 156-1/2 S on the NW corner of the intersection, 3.72 m
(12.2 ft) NNW of a fire hydrant on the SW corner of the intersection, and 0.58 m
(1.9 ft) SSW of the standard NOS witness post. The bench mark is set 9 cm (0.3
ft) below ground level, crimped to the top of a stainless steel rod driven 19.5
m (64 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 5 of 9
Station ID: 8761899 PUBLICATION DATE: 04/09/2018
Name: LAFITTE, BARATARIA WATERWAY
LA
NOAA Chart: 11352 Latitude: 29° 40.0' N ( 29.66670)
USGS Quad: LAFITTE Longitude: 90° 6.7' W ( -90.11170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: JPW 117 B
DESIGNATION: JPW 117 B
MONUMENTATION: Metal Rod VM#: 11052
AGENCY: LA-051 (Jefferson Parish Louisiana) IDB PID#: AU2308
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 40.1' N ( 29.66830) LONGITUDE: 90° 6.7' W ( -90.11170)
The bench mark is a disk located east of the tide gauge at the SW corner of the
basketball courtyard, 58.70 m (192.6 ft) SSE of bench mark 1899 A 1985, 23.99 m
(78.7 ft) south of the centerline of 3rd Street, 6.07 m (19.9 ft) north of the
centerline of an asphalt drive, 3.38 m (11.1 ft) WNW of the SW corner of the
basketball court, 2.23 m (7.3 ft) north of the SW fence corner of the basketball
courtyard, and 1.92 m (6.3 ft) SE of the SE corner of the pavillion. The bench
mark is set 6 cm (0.2 ft) below ground level, crimped to the top of a stainless
steel rod driven 30.5 m (100 ft) and encased in a PVC pipe.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 9
Station ID: 8761899 PUBLICATION DATE: 04/09/2018
Name: LAFITTE, BARATARIA WATERWAY
LA
NOAA Chart: 11352 Latitude: 29° 40.0' N ( 29.66670)
USGS Quad: LAFITTE Longitude: 90° 6.7' W ( -90.11170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: LAFITTE 1934
DESIGNATION: LAFITTE
MONUMENTATION: Triangulation Station disk VM#: 11053
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AU2314
SETTING CLASSIFICATION: Concrete post OPUS PID:
LATITUDE: 29° 40.1' N ( 29.66830) LONGITUDE: 90° 6.6' W ( -90.11000)
The bench mark is a disk set in the top of a concrete post on the south side of
State Highway 45, near its end at the Barataria Waterway, 50.96 m (167.2 ft)
west of bench mark LAFITTE NO 1 1934, 13.72 m (45.0 ft) ESE of a water valve on
the south side of the highway, 12.07 m (39.6 ft) SE of a guy wire anchor for a
power pole on the south side of the highway, 8.41 m (27.6 ft) SSW of a power
pole on the south side of Louisiana Highway 45, 0.37 m (1.2 ft) south of a
standard USC&GS metal witness post, and 0.30 m (1.0 ft) above the ground level.
NOTE: Mark not found in 1994 by NGS.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 9
Station ID: 8761899 PUBLICATION DATE: 04/09/2018
Name: LAFITTE, BARATARIA WATERWAY
LA
NOAA Chart: 11352 Latitude: 29° 40.0' N ( 29.66670)
USGS Quad: LAFITTE Longitude: 90° 6.7' W ( -90.11170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: LAFITTE NO 1 1934
DESIGNATION: LAFITTE RM 1
MONUMENTATION: Reference Mark disk VM#: 11054
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AU2315
SETTING CLASSIFICATION: Concrete post OPUS PID:
LATITUDE: 29° 40.1' N ( 29.66830) LONGITUDE: 90° 6.6' W ( -90.11000)
The bench mark is a disk set in the top of a concrete post at the SE corner of
the intersection of Marrero Street and State Highway 45, 75.96 m (249.2 ft)
north of bench mark 1899 C 1985, 16.76 m (55.0 ft) east of a fire hydrant on the
SW corner of the intersection, 9.66 m (31.7 ft) south of the centerline of
Louisiana Highway 45, 4.02 m (13.2 ft) north of the NW corner of a concrete
block building, and at ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 9
Station ID: 8761899 PUBLICATION DATE: 04/09/2018
Name: LAFITTE, BARATARIA WATERWAY
LA
NOAA Chart: 11352 Latitude: 29° 40.0' N ( 29.66670)
USGS Quad: LAFITTE Longitude: 90° 6.7' W ( -90.11170)
T I D A L D A T U M S
Tidal datums at LAFITTE, BARATARIA WATERWAY based on:
LENGTH OF SERIES: 5 YEARS
TIME PERIOD: January 1986 - December 1990
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 (10/29/1985) = 0.949
MEAN HIGHER HIGH WATER MHHW = 0.099
MEAN HIGH WATER MHW = 0.099
MEAN SEA LEVEL MSL = 0.052
MEAN TIDE LEVEL MTL = 0.050
MEAN LOW WATER MLW = 0.000
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (12/23/1989) = -1.045
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
1899 A 1985 0.614 0.515
1899 B 1985 -0.232 -0.331
1899 C 1985 -0.175 -0.274
1899 D 1985 0.011 -0.088
JPW 117 B 0.087 -0.012
LAFITTE 1934 0.042 -0.057
LAFITTE NO 1 1934 0.206 0.107
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 9 of 9
Station ID: 8761899 PUBLICATION DATE: 04/09/2018
Name: LAFITTE, BARATARIA WATERWAY
LA
NOAA Chart: 11352 Latitude: 29° 40.0' N ( 29.66670)
USGS Quad: LAFITTE Longitude: 90° 6.7' W ( -90.11170)
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.