U.S. DEPARTMENT OF COMMERCE
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National Ocean Service
Datums Page Page 1 of 6
Station ID: 8747038 PUBLICATION DATE: 02/05/2004
Name: HENDERSON AVENUE BRIDGE, WOLF RIVER
MS
NOAA Chart: 11371 Latitude: 30° 21.5' N ( 30.35830)
USGS Quad: BAY ST. LOUIS Longitude: 89° 16.4' W ( -89.27330)
To reach the tidal bench marks from the intersection of Henderson Avenue and
U.S. Highway 90 in Pass Christian, proceed 5.8 km (3.6 mi) north on Henderson
Avenue (which becomes West Wittman Road) to the bridge over the Wolf River. The
bench marks are located in the vicinity of the bridge. 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
DESIGNATION: 874 7038 C
MONUMENTATION: Tidal Station disk VM#: 10422
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 21.5' N ( 30.35830) LONGITUDE: 89° 16.4' W ( -89.27330)
The primary bench mark is a disk located at the south end of the bridge over the
Wolf River, 27 m (90 ft) south of the south shore of the Wolf River, 8.08 m
(26.5 ft) ENE of the centerline of Henderson Avenue, 5 m (18 ft) NNE of the SE
corner of the bridge, and 5 m (16 ft) south of a three-pole powerline structure
on the south side of the river. The bench mark is set 0.15 m (0.5 ft) below
ground level, crimped to a steel rod driven 16.5 m (54 ft) 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 2 of 6
Station ID: 8747038 PUBLICATION DATE: 02/05/2004
Name: HENDERSON AVENUE BRIDGE, WOLF RIVER
MS
NOAA Chart: 11371 Latitude: 30° 21.5' N ( 30.35830)
USGS Quad: BAY ST. LOUIS Longitude: 89° 16.4' W ( -89.27330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7038 A 1978
DESIGNATION: 874 7038 A
MONUMENTATION: Tidal Station disk VM#: 10420
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete apron OPUS PID:
LATITUDE: 30° 21.5' N ( 30.35830) LONGITUDE: 89° 16.4' W ( -89.27330)
The bench mark is a disk set flush in a concrete apron on the east side of the
center span of the bridge over the Wolf River, 9 m (28 ft) east of the NE corner
of the draw bridge control house, 2.62 m (8.6 ft) north of the steel handrail on
the center span, and 0.27 m (0.9 ft) west of the handrail.
BENCH MARK STAMPING: 7038 B 1978
DESIGNATION: 874 7038 B
MONUMENTATION: Tidal Station disk VM#: 10421
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Old building foundation OPUS PID:
LATITUDE: 30° 21.5' N ( 30.35830) LONGITUDE: 89° 16.4' W ( -89.27330)
The bench mark is a disk SW of the south end of the 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, 37 m (121 ft) south
of the dirt and asphalt road, 26.79 m (87.9 ft) north of the rear SE corner of
the foundation, and 0.46 m (1.5 ft) west of the east edge of the foundation.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8747038 PUBLICATION DATE: 02/05/2004
Name: HENDERSON AVENUE BRIDGE, WOLF RIVER
MS
NOAA Chart: 11371 Latitude: 30° 21.5' N ( 30.35830)
USGS Quad: BAY ST. LOUIS Longitude: 89° 16.4' W ( -89.27330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7038 D 1978
DESIGNATION: 874 7038 D
MONUMENTATION: Tidal Station disk VM#: 10423
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 21.5' N ( 30.35830) LONGITUDE: 89° 16.4' W ( -89.27330)
The bench mark is a disk located at the center of a fork between West Wittman
Road and a small dirt road leading SW to the north shore of the river, 108 m
(355 ft) north of the north shore of the river, 100 m (329 ft) north of the
north end of the bridge over the Wolf River, 10 m (32 ft) west of the centerline
of West Wittman Road, and 4 m (14 ft) NW of a power pole on the west side of
West Wittman Road. The bench mark is set 0.15 m (0.5 ft) below ground level,
crimped to a steel rod driven 16.5 m (54 ft) 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 6
Station ID: 8747038 PUBLICATION DATE: 02/05/2004
Name: HENDERSON AVENUE BRIDGE, WOLF RIVER
MS
NOAA Chart: 11371 Latitude: 30° 21.5' N ( 30.35830)
USGS Quad: BAY ST. LOUIS Longitude: 89° 16.4' W ( -89.27330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7038 E 1978
DESIGNATION: 874 7038 E
MONUMENTATION: Tidal Station disk VM#: 10424
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 21.5' N ( 30.35830) LONGITUDE: 89° 16.4' W ( -89.27330)
The bench mark is a disk located 46 m (150 ft) west of the south end of the
bridge over the Wolf River, 22 m (71 ft) NE of the north brick entrance pillar
to Oak Grove Farm, 11 m (36 ft) north of the centerline of a small dirt road and
asphalt road leading to Oak Grove Farm entrance, 9 m (30 ft) south of the south
shore of the river on the south shore of the Wolf River, 7 m (22 ft) west of the
centerline of an old dirt boat ramp, and 1 m (2 ft) south of a 24-inch diameter
pecan tree. The bench mark is set 0.12 m (0.4 ft) below ground level, crimped
to a steel rod driven 16.5 m (54 ft) 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
Station ID: 8747038 PUBLICATION DATE: 02/05/2004
Name: HENDERSON AVENUE BRIDGE, WOLF RIVER
MS
NOAA Chart: 11371 Latitude: 30° 21.5' N ( 30.35830)
USGS Quad: BAY ST. LOUIS Longitude: 89° 16.4' W ( -89.27330)
T I D A L D A T U M S
Tidal datums at HENDERSON AVENUE BRIDGE, WOLF RIVER based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: June 1978 - May 1979
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8747437 BAY WAVELAND YC, BAY ST. LOUIS
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (07/11/1979) = 2.629
MEAN HIGHER HIGH WATER MHHW = 0.548
MEAN HIGH WATER MHW = 0.497
MEAN SEA LEVEL MSL = 0.277
MEAN TIDE LEVEL MTL = 0.274
MEAN LOW WATER MLW = 0.050
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/01/1979) = -0.880
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
7038 C 1978 2.278 1.781
7038 A 1978 5.681 5.184
7038 B 1978 2.260 1.763
7038 D 1978 0.876 0.379
7038 E 1978 2.643 2.146
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8747038 PUBLICATION DATE: 02/05/2004
Name: HENDERSON AVENUE BRIDGE, WOLF RIVER
MS
NOAA Chart: 11371 Latitude: 30° 21.5' N ( 30.35830)
USGS Quad: BAY ST. LOUIS Longitude: 89° 16.4' W ( -89.27330)
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.