U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 12/21/1982
Station ID: 8747038 SUPERCEDED DATE: 04/21/2003
Name: HENDERSON AVENUE BRIDGE, WOLFRIVER
MISSISSIPPI
NOAA Chart: 11371 Latitude: 30° 21.5' N
USGS Quad: BAY ST.LOUIS Longitude: 89° 16.4' W
To reach the tidal bench marks from the intersection of Henderson Avenue and
U.S. Highway 90 in Pass Christian, proceed 3.6 miles (5.8 km) north on Henderson
Avenue to the bridge over the Wolf River. The tide gage and staff were located
on the NW fender of the bridge beneath the control house.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7038 C 1978
MONUMENTATION: Survey Disk VM#: 10422
AGENCY: PID:
SETTING CLASSIFICATION: Stainless Steel Rod
The bench mark is at the south end of the Henderson Avenue bridge over the Wolf
River, 90 feet (27 m) south of the south shore of the Wolf River, 26.5 feet (8.1
m) ENE of the centerline of Henderson Avenue, 18 feet (5 m) NNE of the SE corner
of the bridge, and 16 feet (5 m) south of a three-pole powerline structure on
the south side of the river. The bench mark is 0.5 foot (0.2 m) below ground
level, crimped to a steel rod driven 54 feet (16 m) to substantial resistance,
and encased in a 4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 7038 A 1978
MONUMENTATION: Survey Disk VM#: 10420
AGENCY: PID:
SETTING CLASSIFICATION: Pavement
The bench mark is set flush in a concrete apron on the east side of the center
span of the Henderson Avenue bridge over the Wolf River, 28 feet (9 m) east of
the NE corner of the draw bridge control house, 8.6 feet (2.6 m) north of the
steel handrail on the center span, and 0.9 foot (0.3 m) west of the handrail.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 12/21/1982
Station ID: 8747038 SUPERCEDED DATE: 04/21/2003
Name: HENDERSON AVENUE BRIDGE, WOLFRIVER
MISSISSIPPI
NOAA Chart: 11371 Latitude: 30° 21.5' N
USGS Quad: BAY ST.LOUIS Longitude: 89° 16.4' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7038 B 1978
MONUMENTATION: Survey Disk VM#: 10421
AGENCY: PID:
SETTING CLASSIFICATION: Mat Foundation
The bench mark is SW of the south end of the Henderson Avenue bridge over the
Wolf River along the dirt and asphalt road leading to Oak Grove Farm, set flush
in the NE corner of the south portion of an old building foundation, 121 feet
(37 m) south of the dirt and asphalt road, 87.9 feet (26.8 m) north of the rear
SE corner of the foundation, and 1.5 feet (0.5 m) west of the east edge of the
foundation.
BENCH MARK STAMPING: 7038 D 1978
MONUMENTATION: Survey Disk VM#: 10423
AGENCY: PID:
SETTING CLASSIFICATION: Stainless Steel Rod
The bench mark is 355 feet (108 m) north of the north shore of the river, 329
feet (100 m) north of the north end of the Henderson Avenue bridge over the Wolf
River, at the center of a fork of Henderson Avenue and a small dirt road leading
SW to the north shore of the river, 32 feet (10 m) west of the centerline of
Henderson Avenue, and 14 feet (4 m) NW of a power pole on the west side of
Henderson Avenue. The bench mark is 0.5 foot (0.2 m) below ground level,
crimped to a steel rod driven 54 feet (16 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 3 of 5
PUBLICATION DATE: 12/21/1982
Station ID: 8747038 SUPERCEDED DATE: 04/21/2003
Name: HENDERSON AVENUE BRIDGE, WOLFRIVER
MISSISSIPPI
NOAA Chart: 11371 Latitude: 30° 21.5' N
USGS Quad: BAY ST.LOUIS Longitude: 89° 16.4' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7038 E 1978
MONUMENTATION: Survey Disk VM#: 10424
AGENCY: PID:
SETTING CLASSIFICATION: Stainless Steel Rod
The bench mark is 150 feet (46 m) west of the south end of the Henderson Avenue
bridge over the Wolf River, 71 feet (22 m) NE of the north brick entrance pillar
to Oak Grove Farm, 36 feet (11 m) north of the centerline of a small dirt road
and asphalt road leading to Oak Grove Farm entrance, 30 feet (9 m) south of the
south shore of the river on the south shore of the Wolf River, 22 feet (7 m)
west of the centerline of an old dirt boat ramp, and 2 feet (1 m) south of a
24-inch diameter pecan tree. The bench mark is 0.4 foot (0.1 m) below ground
level, crimped to a steel rod driven 54 feet (16 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 4 of 5
PUBLICATION DATE: 12/21/1982
Station ID: 8747038 SUPERCEDED DATE: 04/21/2003
Name: HENDERSON AVENUE BRIDGE, WOLFRIVER
MISSISSIPPI
NOAA Chart: 11371 Latitude: 30° 21.5' N
USGS Quad: BAY ST.LOUIS Longitude: 89° 16.4' W
T I D A L D A T U M S
Tidal datums at HENDERSON AVENUE BRIDGE, WOLFRIVER based on:
LENGTH OF SERIES: 12 MONTHS
TIME PERIOD: JUNE 1978-MAY 1979
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8747437 BAY WAVELAND YACHTCLUB, BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (04/22/1979) = 5.06
MEAN HIGHER HIGH WATER MHHW = 1.80
MEAN HIGH WATER MHW = 1.61
MEAN TIDE LEVEL MTL = 0.90
MEAN LOW WATER MLW = 0.20
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (01/02/1979) = -2.05
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
7038 C 1978 7.64 6.03
7038 A 1978 18.81 17.20
7038 B 1978 7.58 5.97
7038 D 1978 3.04 1.43
7038 E 1978 8.84 7.23
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 12/21/1982
Station ID: 8747038 SUPERCEDED DATE: 04/21/2003
Name: HENDERSON AVENUE BRIDGE, WOLFRIVER
MISSISSIPPI
NOAA Chart: 11371 Latitude: 30° 21.5' N
USGS Quad: BAY ST.LOUIS Longitude: 89° 16.4' 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 (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 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.