U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8749704 PUBLICATION DATE: 05/23/2003
Name: PEARLINGTON, PEARL RIVER
MS
NOAA Chart: 11371 Latitude: 30° 14.4' N ( 30.24000)
USGS Quad: ENGLISH LOOKOUT Longitude: 89° 36.9' W ( -89.61500)
To reach the tidal bench marks from the intersection of U.S. Highway 90 and
State Highway 604 in Pearlington, proceed north on State Highway 604 for 0.6 km
(0.4 mi) to Baxters Pearl River Marina on the left. The bench marks are on the
marina property and south along State Highway 604. The tide gage and staff were
located at the west end of the dock on the north side of the south boat basin.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 9704 A 1978
DESIGNATION: 874 9704 A
MONUMENTATION: Tidal Station disk VM#: 10534
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 14.4' N ( 30.24000) LONGITUDE: 89° 36.9' W ( -89.61500)
The primary bench mark is a disk located near the south boat basin of the
marina, 38 m (125 ft) south of the south bank of the north boat basin, 12.50 m
(41.0 ft) NW of a 0.15 m (0.5 ft) diameter persimmon tree, 5 m (17 ft) east of
the east shore of Pearl River, and 5 m (16 ft) north of the north bank of the
south boat basin. The bench mark is set 0.15 m (0.5 ft) below ground level,
crimped to the top of a stainless 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: 8749704 PUBLICATION DATE: 05/23/2003
Name: PEARLINGTON, PEARL RIVER
MS
NOAA Chart: 11371 Latitude: 30° 14.4' N ( 30.24000)
USGS Quad: ENGLISH LOOKOUT Longitude: 89° 36.9' W ( -89.61500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 1 1971
DESIGNATION: 874 9704 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 10532
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete slab OPUS PID:
LATITUDE: 30° 14.4' N ( 30.24000) LONGITUDE: 89° 36.9' W ( -89.61500)
The bench mark is a disk set flush in the SW corner of a 6 m x 6 m (20 ft x 20
ft) concrete slab which is part of a boat hoist, on the south side of the north
boat basin of the marina, and 58 m (190 ft) NE of bench mark 9704 A 1978.
BENCH MARK STAMPING: NO 2 1971
DESIGNATION: 874 9704 TIDAL 2
MONUMENTATION: Tidal Station disk VM#: 10533
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete steps OPUS PID:
LATITUDE: 30° 14.4' N ( 30.24000) LONGITUDE: 89° 36.9' W ( -89.61500)
The bench mark is a disk set flush in the NW corner of the concrete steps
leading to the west entrance to the Baxter residence on the marina property,
south of the entrance driveway to the marina.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8749704 PUBLICATION DATE: 05/23/2003
Name: PEARLINGTON, PEARL RIVER
MS
NOAA Chart: 11371 Latitude: 30° 14.4' N ( 30.24000)
USGS Quad: ENGLISH LOOKOUT Longitude: 89° 36.9' W ( -89.61500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9704 B 1978
DESIGNATION: 874 9704 B
MONUMENTATION: Tidal Station disk VM#: 10535
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 14.4' N ( 30.24000) LONGITUDE: 89° 36.9' W ( -89.61500)
The bench mark is a disk located outside the fence at the SE corner of the
marina property, 70 m (231 ft) south of the center line of the Pearl River
Marina entrance drive, 20.12 m (66.1 ft) south of the center line of a 1.07 m
(3.5 ft) diameter culvert for a drainage ditch running east-west, 10.36 m (34.0
ft) NW of the centerline intersection of State Highway 604 and First Street,
8.41 m (27.6 ft) west of the centerline of State Highway 604, 2.74 m (9.0 ft) NE
of the intersection of two fence lines at the SE corner of the marina property,
and 2.53 m (8.3 ft) east of the fence. The bench mark is set 0.18 m (0.6 ft)
below ground level, crimped to the top of a stainless steel rod driven 14.6 m
(48 ft) to refusal, 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: 8749704 PUBLICATION DATE: 05/23/2003
Name: PEARLINGTON, PEARL RIVER
MS
NOAA Chart: 11371 Latitude: 30° 14.4' N ( 30.24000)
USGS Quad: ENGLISH LOOKOUT Longitude: 89° 36.9' W ( -89.61500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9704 C 1978
DESIGNATION: 874 9704 C
MONUMENTATION: Tidal Station disk VM#: 10536
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 14.4' N ( 30.24000) LONGITUDE: 89° 36.9' W ( -89.61500)
The bench mark is a disk located 122 m (400 ft) SE of bench mark 9704 B 1978,
117 m (383 ft) south of the centerline of First Street, 19 m (61 ft) NE of a
0.46 m (1.5 ft) diameter pecan tree (on the west side of State Highway 604) in
the front yard of a light brown brick residence, 8.69 m (28.5 ft) east of the
centerline of State Highway 604, and 0.61 m (2.0 ft) south of power pole #54.
The bench mark is set 0.18 m (0.6 ft) below ground level, crimped to the top of
a stainless steel rod driven 14.6 m (48 ft) to refusal, 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: 8749704 PUBLICATION DATE: 05/23/2003
Name: PEARLINGTON, PEARL RIVER
MS
NOAA Chart: 11371 Latitude: 30° 14.4' N ( 30.24000)
USGS Quad: ENGLISH LOOKOUT Longitude: 89° 36.9' W ( -89.61500)
T I D A L D A T U M S
Tidal datums at PEARLINGTON, PEARL RIVER based on:
LENGTH OF SERIES: 2 YEARS
TIME PERIOD: January 1983 - December 1984
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 (04/10/1983) = 1.906
MEAN HIGHER HIGH WATER MHHW = 0.374
MEAN HIGH WATER MHW = 0.362
MEAN SEA LEVEL MSL = 0.204
MEAN TIDE LEVEL MTL = 0.188
MEAN LOW WATER MLW = 0.013
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (03/02/1980) = -0.724
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
9704 A 1978 1.129 0.767
NO 1 1971 1.095 0.733
NO 2 1971 2.288 1.926
9704 B 1978 1.584 1.222
9704 C 1978 1.228 0.866
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8749704 PUBLICATION DATE: 05/23/2003
Name: PEARLINGTON, PEARL RIVER
MS
NOAA Chart: 11371 Latitude: 30° 14.4' N ( 30.24000)
USGS Quad: ENGLISH LOOKOUT Longitude: 89° 36.9' W ( -89.61500)
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.