U.S. DEPARTMENT OF COMMERCE
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National Ocean Service
Datums Page Page 1 of 10
Station ID: 8762084 PUBLICATION DATE: 04/24/2018
Name: LEEVILLE, BAYOU LAFOURCHE
LA
NOAA Chart: 11357 Latitude: 29° 14.9' N ( 29.24830)
USGS Quad: LEEVILLE Longitude: 90° 12.7' W ( -90.21170)
To reach the tidal bench marks from the State Highway 1 bridge over Bayou
Lafourche, proceed east then south on State Highway 1 to a left turn onto old
State Highway 1, take old State Highway 1 north to its end at the bayou. The
bench marks are along the shell drive in front of Standard Supply Co. and south
along old State Highway l. The tide gage and staff were at the west end of a
small wharf along the south side of a small slip NW of Standard Supply Co.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 2084 A 1986
DESIGNATION: 876 2084 A TIDAL
MONUMENTATION: Survey disk VM#: 7220
AGENCY: National Ocean Service (NOS) IDB PID#: AU3521
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 14.8' N ( 29.24670) LONGITUDE: 90° 12.5' W ( -90.20830)
The primary bench mark is a disk located 27.71 m (90.9 ft) NNW of the NW corner
of the Lafourche Telephone Co. Leeville exchange brick building, 15.67 m (51.4
ft) SSE of the pole supporting the riser poles for the power line crossing Bayou
Lafourche, 10.39 m (34.l ft) south of the most southern pole of a pair of power
poles supporting a power line crossing the bayou, and 0.61 m (2.0 ft) east of a
witness post. The bench mark is set at ground level, crimped to a stainless
steel rod driven 18 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 2 of 10
Station ID: 8762084 PUBLICATION DATE: 04/24/2018
Name: LEEVILLE, BAYOU LAFOURCHE
LA
NOAA Chart: 11357 Latitude: 29° 14.9' N ( 29.24830)
USGS Quad: LEEVILLE Longitude: 90° 12.7' W ( -90.21170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2084 B 1986
DESIGNATION: 876 2084 B TIDAL
MONUMENTATION: Survey disk VM#: 7221
AGENCY: National Ocean Service (NOS) IDB PID#: AU3519
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 14.8' N ( 29.24670) LONGITUDE: 90° 12.5' W ( -90.20830)
The bench mark is a disk located 76.20 m (250.0 ft) ENE of Bench Mark 2084 A
1986, 21.52 m (70.6 ft) south of a power pole located 23 m (75 ft) north of the
Standard Supply Co. front entrance, 15 m (49 ft) north of the NE corner of the
Standard Supply Co. building, 6.31 m (20.7 ft) SW of the SE corner of an old tin
building north of Standard Supply Co., and 0.37 m (1.2 ft) SE of a witness post.
The bench mark is set at ground level, crimped to a stainless steel rod driven
20 m (64 ft) to refusal, and encased in a 5-inch PVC pipe and concrete
kickblock.
BENCH MARK STAMPING: 2084 C 1986
DESIGNATION: 876 2084 C TIDAL
MONUMENTATION: Survey disk VM#: 7222
AGENCY: National Ocean Service (NOS) IDB PID#: AU3284
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 14.8' N ( 29.24670) LONGITUDE: 90° 12.5' W ( -90.20830)
The bench mark is a disk located 66.45 m (218.0 ft) east of Bench Mark 2084 B
1986, 38.95 m (127.8 ft) SSE of a fire hydrant on the north side of the Standard
Supply Co. shell drive at its intersection with old State Highway 1, 8.29 m
(27.2 ft) west of a black and white reflector marker on the north side of old
State Highway 1, and 0.49 m (1.6 ft) south of a witness post. The bench mark is
set at ground level, crimped to a stainless steel rod driven 24 m (80 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 10
Station ID: 8762084 PUBLICATION DATE: 04/24/2018
Name: LEEVILLE, BAYOU LAFOURCHE
LA
NOAA Chart: 11357 Latitude: 29° 14.9' N ( 29.24830)
USGS Quad: LEEVILLE Longitude: 90° 12.7' W ( -90.21170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2084 D 1986
DESIGNATION: 876 2084 D TIDAL
MONUMENTATION: Survey disk VM#: 7223
AGENCY: National Ocean Service (NOS) IDB PID#: AU3518
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 14.8' N ( 29.24670) LONGITUDE: 90° 12.5' W ( -90.20830)
The bench mark is a disk located 76.20 m (250.0 ft) SSE of Bench Mark 2084 C
1986, 49.96 m (163.9 ft) NNW of a 0.3 m (1.0 ft) diameter hackberry tree north
of old State Highway 1, 14.81 m (48.6 ft) NW of a steel sign post, 4.57 m (15.0
ft) north of the centerline of old State Highway 1, and 0.46 m (1.5 ft) south of
a witness post. The bench mark is set at ground level, crimped to a stainless
steel rod driven 20 m (64 ft) to refusal, and encased in a 5-inch PVC pipe and
concrete kickblock.
BENCH MARK STAMPING: 2084 E 1986
DESIGNATION: 876 2084 E TIDAL
MONUMENTATION: Survey disk VM#: 7224
AGENCY: National Ocean Service (NOS) IDB PID#: AU3517
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 14.8' N ( 29.24670) LONGITUDE: 90° 12.5' W ( -90.20830)
The bench mark is a disk located 76.20 m (250.0 ft) south of Bench Mark 2084 D
1986, 26.64 m (87.4 ft) south of a 0.3 m (1.0 ft) diameter hackberry tree north
of old State Highway 1, 5.43 m (17.8 ft) ENE of the centerline of old State
Highway 1, and 0.46 m (1.5 ft) WSW of a witness post. The bench mark is set at
ground level, crimped to a stainless steel rod driven 20 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 4 of 10
Station ID: 8762084 PUBLICATION DATE: 04/24/2018
Name: LEEVILLE, BAYOU LAFOURCHE
LA
NOAA Chart: 11357 Latitude: 29° 14.9' N ( 29.24830)
USGS Quad: LEEVILLE Longitude: 90° 12.7' W ( -90.21170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2084 F 1987
DESIGNATION: 876 2084 F TIDAL
MONUMENTATION: Survey disk VM#: 7225
AGENCY: National Ocean Service (NOS) IDB PID#: AU3516
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 14.8' N ( 29.24670) LONGITUDE: 90° 12.5' W ( -90.20830)
The bench mark is a disk located 236 m (775 ft) south along old State Highway 1
from Bench Mark 2084 E 1986, 22 m (73 ft) west of the shoreline of a borrow
ditch, 4.54 m (14.9 ft) east of the centerline of old State Highway 1, and 0.46
m (1.5 ft) west of a witness post. The bench mark is set at ground level,
crimped to a stainless steel rod driven 28 m (92 ft) to refusal, and encased in
a PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 2084 G 1987
DESIGNATION: 876 2084 G TIDAL
MONUMENTATION: Survey disk VM#: 7226
AGENCY: National Ocean Service (NOS) IDB PID#: AU3515
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 14.8' N ( 29.24670) LONGITUDE: 90° 12.5' W ( -90.20830)
The bench mark is a disk located 23 m (75 ft) west of the shoreline of the
borrow ditch, 8.26 m (27.1 ft) south of Bench Mark 2084 F 1987, and 4.57 m (15.0
ft) east of the centerline of old State Highway 1. The bench mark is set at
ground level, crimped to a stainless steel rod driven 5 m (16 ft), and encased
in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 10
Station ID: 8762084 PUBLICATION DATE: 04/24/2018
Name: LEEVILLE, BAYOU LAFOURCHE
LA
NOAA Chart: 11357 Latitude: 29° 14.9' N ( 29.24830)
USGS Quad: LEEVILLE Longitude: 90° 12.7' W ( -90.21170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: N 359 1982
DESIGNATION: N 359
MONUMENTATION: Survey disk VM#: 7227
AGENCY: National Ocean Survey (NOS) IDB PID#: AU2035
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 29° 14.8' N ( 29.24670) LONGITUDE: 90° 12.5' W ( -90.20830)
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 10
Station ID: 8762084 PUBLICATION DATE: 04/24/2018
Name: LEEVILLE, BAYOU LAFOURCHE
LA
NOAA Chart: 11357 Latitude: 29° 14.9' N ( 29.24830)
USGS Quad: LEEVILLE Longitude: 90° 12.7' W ( -90.21170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: JESSE 1955
DESIGNATION: JESSE
MONUMENTATION: Triangulation Station disk VM#: 7229
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AU1255
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 29° 14.1' N ( 29.23506) LONGITUDE: 90° 12.6' W ( -90.20978)
The bench mark is a disk set in top of a concrete monument, located on a small
levee, 1.13 km (0.7 mi) south along LA Highway 1 from the south end of the ramp
of the Leeville bridge, 49.9 m (153.9 ft) east of the centerline of the highway,
19.1 m (128.3 ft) ESE of a utility pole, 22.3 m (73.2 ft) east of JESSE NO 1
1955, 12.8 m (42.0 ft) north of the north edge of a ditch, 0.5 m (1.6 ft) west
of a witness post, 0.6 m (1.97 ft) west of a witness post, 0.3 m (1.0 ft) below
the level of the highway, and flush with the ground surface.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 10
Station ID: 8762084 PUBLICATION DATE: 04/24/2018
Name: LEEVILLE, BAYOU LAFOURCHE
LA
NOAA Chart: 11357 Latitude: 29° 14.9' N ( 29.24830)
USGS Quad: LEEVILLE Longitude: 90° 12.7' W ( -90.21170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: JESSE NO 1 1955
DESIGNATION: JESSE RM 1
MONUMENTATION: Reference Mark disk VM#: 7230
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AU2036
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 29° 14.1' N ( 29.23508) LONGITUDE: 90° 12.6' W ( -90.21000)
The bench mark is a disk set in top of a concrete monument, located on a small
levee, 1.13 km (0.7 mi) south along LA Highway 1 from the south end of the ramp
of the Leeville bridge, 24.7 m (81.0 ft) east of the centerline of the highway,
22.3 m (73.2 ft) west of JESSE 1955, 16.5 m (54.1 ft) east of a utility pole
with 3 guy cables attached, 10.4 m (34.1 ft) north of the north edge of a ditch,
0.7 m (2.3 ft) north of a witness post, 0.3 m (1.0 ft) below the level of the
highway, and flush with the ground surface.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 10
Station ID: 8762084 PUBLICATION DATE: 04/24/2018
Name: LEEVILLE, BAYOU LAFOURCHE
LA
NOAA Chart: 11357 Latitude: 29° 14.9' N ( 29.24830)
USGS Quad: LEEVILLE Longitude: 90° 12.7' W ( -90.21170)
T I D A L D A T U M S
Tidal datums at LEEVILLE, BAYOU LAFOURCHE based on:
LENGTH OF SERIES: 4 YEARS
TIME PERIOD: January 1987 - 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 (03/24/1987) = 0.472
MEAN HIGHER HIGH WATER MHHW = 0.269
MEAN HIGH WATER MHW = 0.265
MEAN SEA LEVEL MSL = 0.143
MEAN TIDE LEVEL MTL = 0.135
MEAN LOW WATER MLW = 0.005
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (12/23/1989) = -0.872
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
2084 A 1986 0.280 0.015
2084 B 1986 0.183 -0.082
2084 C 1986 0.863 0.598
2084 D 1986 1.015 0.750
2084 E 1986 0.712 0.447
2084 F 1987 0.330 0.065
2084 G 1987 0.315 0.050
N 359 1982 0.825 0.560
JESSE 1955 0.303 0.038
JESSE NO 1 1955 0.353 0.088
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 9 of 10
Station ID: 8762084 PUBLICATION DATE: 04/24/2018
Name: LEEVILLE, BAYOU LAFOURCHE
LA
NOAA Chart: 11357 Latitude: 29° 14.9' N ( 29.24830)
USGS Quad: LEEVILLE Longitude: 90° 12.7' W ( -90.21170)
Foot Notes:
Bench marks N 359 1982, JESSE 1955, and JESSE NO 1 1955 are based on one
differential leveling connection and do not meet the quality control standards
of the NOS. Therefore, caution should be used when deriving elevations for
these marks.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 10 of 10
Station ID: 8762084 PUBLICATION DATE: 04/24/2018
Name: LEEVILLE, BAYOU LAFOURCHE
LA
NOAA Chart: 11357 Latitude: 29° 14.9' N ( 29.24830)
USGS Quad: LEEVILLE Longitude: 90° 12.7' W ( -90.21170)
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.