Published Bench Mark Sheet for 8761487 CHEF MENTEUR, CHEF MENTEUR PASS LOUISIANA
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
PUBLICATION DATE: 03/19/1986
Station ID: 8761487 SUPERCEDED DATE: 04/21/2003
Name: CHEF MENTEUR, CHEF MENTEUR PASS
LOUISIANA
NOAA Chart: 11369 Latitude: 30° 3.9' N
USGS Quad: CHEF MENTEUR Longitude: 89° 48.0' W
To reach the tidal bench marks from the NE end of the U.S. Highway 90 bridge
over Chef Menteur Pass, proceed south on a shell road for 0.3 mile (0.5 km) to
the Tally-Ho Club on the right. The bench marks are in the vicinity of the club
and north along the shell road. The tide gage and staff were located at the NW
end of the small dock in front of the club.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 1487 A 1982
MONUMENTATION: Survey Disk VM#: 7171
AGENCY: PID:
SETTING CLASSIFICATION: Stainless Steel Rod
The bench mark is at the Tally-Ho Club, 48 feet (15 m) NNW of light pole #117,
42 feet (13 m) west of the NW corner of the club house porch, 25 feet (8 m) SE
of the SE wall of a tin boat shed, and 4 feet (1 m) NE of the wooden bulkhead.
The bench mark is 0.4 foot (0.1 m) below ground level, crimped to the top of a
stainless steel rod driven 76 feet (23 m) to substantial resistance, and encased
in a 4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: WES 11 1978
MONUMENTATION: Survey Disk VM#: 7172
AGENCY: PID:
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is 0.3 mile (0.5 km) south on a shell road from the NE end of the
U.S. Highway 90 bridge over Chef Menteur Pass, 86.4 feet (26.3 m) ENE of the
south corner of Harbor Cottage Camp, 63.6 feet (19.4 m) NNE of the north corner
of a grey boat shed, 9 feet (3 m) SW of the centerline of the road, 7.7 feet
(2.3 m) north of a creosote post, and 2 feet (0.6 m) NE of a witness post. The
bench mark is at ground level, crimped to the top of a copper-clad steel rod
driven 30 feet (9 m), and encased in a 6-inch PVC pipe.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
PUBLICATION DATE: 03/19/1986
Station ID: 8761487 SUPERCEDED DATE: 04/21/2003
Name: CHEF MENTEUR, CHEF MENTEUR PASS
LOUISIANA
NOAA Chart: 11369 Latitude: 30° 3.9' N
USGS Quad: CHEF MENTEUR Longitude: 89° 48.0' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: WES 12 1978
MONUMENTATION: Survey Disk VM#: 7173
AGENCY: PID:
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is 0.4 mile (0.6 km) south on a shell road from the NE end of the
U.S. Highway 90 bridge over Chef Menteur Pass, 54 feet (16 m) east of the SE
corner of the Tally-Ho Club building, 4.5 feet (1.4 m) SE of a power pole with
transformer, and 2 feet (1 m) east of a witness post and sign. The bench mark
is at ground level, crimped to the top of a copper-clad steel rod driven 110
feet (34 m), and encased in a 6-inch plastic pipe.
BENCH MARK STAMPING: WES 13 1978
MONUMENTATION: Survey Disk VM#: 7174
AGENCY: PID:
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is 0.5 mile (0.8 km) south on a shell road from the NE end of the
U.S. Highway 90 bridge over Chef Menteur Pass, 39.3 feet (12.0 m) east of the SE
corner of an elevated camp house, 16 feet (5 m) NE of power pole #453C, 13.5
feet (4.1 m) west of the NW end of a wooden bridge, and 2 feet (1 m) NNE of a
witness post and sign. The bench mark is at ground level, crimped to the top of
a copper-clad steel rod driven 115 feet (35 m), and encased in a 6-inch plastic
pipe.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
PUBLICATION DATE: 03/19/1986
Station ID: 8761487 SUPERCEDED DATE: 04/21/2003
Name: CHEF MENTEUR, CHEF MENTEUR PASS
LOUISIANA
NOAA Chart: 11369 Latitude: 30° 3.9' N
USGS Quad: CHEF MENTEUR Longitude: 89° 48.0' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: E 3145
MONUMENTATION: Survey Disk VM#: 7175
AGENCY: PID#: BH1133
SETTING CLASSIFICATION: Concrete Bridge Floor
The bench mark is at the NE end of the U.S. Highway 90 bridge over Chef Menteur
Pass, set in the concrete bridge floor, 247 feet (75 m) SW of the NE end of the
bridge, 9 feet (3 m) NW of the centerline of the bridge, 2.5 feet (0.8 m) NE of
the NE end of the steel span of the bridge, and 0.5 foot (0.2 m) SE of the SE
face of the NW guard rail base.
BENCH MARK STAMPING: F 193 1963
MONUMENTATION: Survey Disk VM#: 7176
AGENCY: PID#: BH1135
SETTING CLASSIFICATION: Copper-coated Steel Rod
The bench mark is 0.2 mile (0.3 m) NE of the NE end of the U.S. Highway 90
bridge over Chef Menteur Pass at Chef Harbor, 113 feet (34 m) NW of the
centerline of the highway, 46 feet (14 m) NE of the centerline of Harbor Drive,
41.2 feet (12.6 m) east of and across a driveway from the south one of 4 metal
boat sheds, 18.5 feet (5.6 m) SW of the centerline of a driveway leading NE, 2.5
feet (0.8 m) NE of power line pole #456 R, and 1.5 feet (0.5 m) SW of a metal
witness post. The bench mark is 0.2 foot (0.1 m) above ground level, crimped to
the top of a copper-coated steel rod driven 56 feet (17 m), and encased in a
4-inch metal pipe projecting 0.3 foot (0.1 m) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
PUBLICATION DATE: 03/19/1986
Station ID: 8761487 SUPERCEDED DATE: 04/21/2003
Name: CHEF MENTEUR, CHEF MENTEUR PASS
LOUISIANA
NOAA Chart: 11369 Latitude: 30° 3.9' N
USGS Quad: CHEF MENTEUR Longitude: 89° 48.0' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1487 B 1982
MONUMENTATION: Survey Disk VM#: 9002
AGENCY: PID:
SETTING CLASSIFICATION: Stainless Steel Rod
The bench mark is NW of the Tally-Ho Club along the shell road, 245 feet (75 m)
NNW of Bench Mark WES 11 1978, 88 feet (27 m) ESE of the south bank of a small,
unnamed canal, 12 feet (4 m) NE of the centerline of the shell road leading to
the club, and 3 feet (1 m) SE of power pole #33. The bench mark is 0.3 foot
(0.1 m) below ground level, crimped to the top of a stainless steel rod driven
72 feet (22 m) to substantial resistance, and encased in a 4-inch PVC pipe and
concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
PUBLICATION DATE: 03/19/1986
Station ID: 8761487 SUPERCEDED DATE: 04/21/2003
Name: CHEF MENTEUR, CHEF MENTEUR PASS
LOUISIANA
NOAA Chart: 11369 Latitude: 30° 3.9' N
USGS Quad: CHEF MENTEUR Longitude: 89° 48.0' W
T I D A L D A T U M S
Tidal datums at CHEF MENTEUR, CHEF MENTEUR PASS based on:
LENGTH OF SERIES: 24 MONTHS
TIME PERIOD: JANUARY 1983-DECEMBER 1984
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8747437 BAY WAVELAND YACHT CLUB, MS
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (01/20/1983) = 5.58
MEAN HIGHER HIGH WATER (MHHW) = 1.07
MEAN HIGH WATER (MHW) = 1.02
MEAN TIDE LEVEL (MTL) = 0.54
MEAN LOW WATER (MLW) = 0.06
MEAN LOWER LOW WATER (MLLW) = 0.00
* NATIONAL GEODETIC VERTICAL DATUM-1929 (NGVD) = -0.18
LOWEST OBSERVED WATER LEVEL (02/29/1984) = -2.00
* NGVD reference based on elevations published in Quad 300893, 1972, and NOS
leveling of 1985.
National Geodetic Vertical Datum (NGVD 29)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
1487 A 1982 2.31 1.29
WES 11 1978 1.49 0.47
WES 12 1978 1.88 0.86
WES 13 1978 2.36 1.34
E 3145 16.37 15.35
F 193 1963 5.17 4.15
1487 B 1982 1.26 0.24
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
PUBLICATION DATE: 03/19/1986
Station ID: 8761487 SUPERCEDED DATE: 04/21/2003
Name: CHEF MENTEUR, CHEF MENTEUR PASS
LOUISIANA
NOAA Chart: 11369 Latitude: 30° 3.9' N
USGS Quad: CHEF MENTEUR Longitude: 89° 48.0' W
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 (NAVD 88).
NGVD 29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD 29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD 29 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 NGVD 29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD 88 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. NAVD 88 replaces NGVD 29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD 88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD 29 and NAVD 88 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 NAVD 88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD 88 elevations.
The NAVD 88 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, NAVD 88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD 88 elevations listed for
each bench mark in the NGS database.
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