U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8743735 PUBLICATION DATE: 07/12/2004
Name: BILOXI (CADET POINT), BILOXI BAY
MS
NOAA Chart: 11373 Latitude: 30° 23.4' N ( 30.39000)
USGS Quad: OCEAN SPRINGS Longitude: 88° 51.4' W ( -88.85670)
To reach the tidal bench marks from the intersection of U.S. Highway 90 and
Myrtle Street in Biloxi, proceed south on Myrtle Street, then immediately east
onto an access road which leads to Marine Education Center, go south at the
Marine Education Center entrance to a parking area and then to the Gulf Coast
Research Lab (GCRL) pier at Cadet Point. The bench marks are located in the
vicinity of the Marine Education Center. The tide gage and staff were located on
the east side of the GCRL concrete pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 1 1966
DESIGNATION: 874 3735 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 11135
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: BH0390
SETTING CLASSIFICATION: Concrete bridge abutment OPUS PID:
LATITUDE: 30° 23.4' N ( 30.39000) LONGITUDE: 88° 51.4' W ( -88.85670)
The primary bench mark is a disk set on top of the east corner of the SE end of
the SW concrete bridge abutment of the U.S. Highway 90 bridge over Biloxi Bay,
5.18 m (17.0 ft) NE of the SW end of the wing wall, and 1.22 m (4.0 ft) below
the level of the bridge sidewalk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8743735 PUBLICATION DATE: 07/12/2004
Name: BILOXI (CADET POINT), BILOXI BAY
MS
NOAA Chart: 11373 Latitude: 30° 23.4' N ( 30.39000)
USGS Quad: OCEAN SPRINGS Longitude: 88° 51.4' W ( -88.85670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 3 1966
DESIGNATION: 874 3735 TIDAL 3
MONUMENTATION: Tidal Station disk VM#: 11136
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: BH0392
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 30° 23.4' N ( 30.39000) LONGITUDE: 88° 51.4' W ( -88.85670)
The bench mark is a disk set in the top of a concrete seawall south of Marine
Education Center, 48.16 m (158.0 ft) SSW of an angle in the seawall along Biloxi
Bay, 45.11 m (148.0 ft) NE of the center of a gate for the concrete pier, 22.28
m (73.1 ft) NE of the east end of a concrete breakwater east of the GCRL pier,
and 0.15 m (0.5 ft) below ground level.
BENCH MARK STAMPING: NO 4 1969
DESIGNATION: 874 3735 TIDAL 4
MONUMENTATION: Tidal Station disk VM#: 11137
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 23.4' N ( 30.39000) LONGITUDE: 88° 51.4' W ( -88.85670)
The bench mark is a disk set in a concrete monument near the foot of the GCRL
pier, 40 m (131 ft) west of bench mark NO 3 1966, 6.71 m (22.0 ft) east of the
centerline of the pier, 1.22 m (4.0 ft) north of the sea wall, and at ground
level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8743735 PUBLICATION DATE: 07/12/2004
Name: BILOXI (CADET POINT), BILOXI BAY
MS
NOAA Chart: 11373 Latitude: 30° 23.4' N ( 30.39000)
USGS Quad: OCEAN SPRINGS Longitude: 88° 51.4' W ( -88.85670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 2 RESET 1976
DESIGNATION: 874 3735 TIDAL 2 RESET
MONUMENTATION: Tidal Station disk VM#: 11138
AGENCY: National Ocean Survey (NOS) IDB PID#: BH0866
SETTING CLASSIFICATION: Sea wall OPUS PID:
LATITUDE: 30° 23.4' N ( 30.39000) LONGITUDE: 88° 51.4' W ( -88.85670)
The bench mark is a disk set flush in the top of the seawall, south of Marine
Education Center, 171 m (560 ft) south of bench mark NO 1 1966, 125 m (410 ft)
NE along the seawall from bench mark NO 3 1966, 61 m (200 ft) east of a
north-south 1.83 m (6.0 ft) high chain link fence, and 11.67 m (38.3 ft) SE of
the flag pole on the SE lawn of Gulf Marine State Park.
BENCH MARK STAMPING: 3735 B 1979
DESIGNATION: 874 3735 B
MONUMENTATION: Tidal Station disk VM#: 11139
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 23.4' N ( 30.39000) LONGITUDE: 88° 51.4' W ( -88.85670)
The bench mark is a disk located nearly midway between Marine Education Center
and the GCRL pier, 72 m (235 ft) north of the pier, 41.45 m (136.0 ft) NNE of a
power pole with three transformers, 38.71 m (127.0 ft) east of the SE corner of
an abandoned concrete foundation, 24.69 m (81.0 ft) SSW of the SW corner of the
picnic pavilion on the Gulf Marine State Park, and 11.34 m (37.2 ft) east of the
centerline of a two-track shell roadway. The bench mark is set 6 cm (0.2 ft)
below ground level, crimped to the top of a stainless steel rod driven 16.8 m
(55 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: 8743735 PUBLICATION DATE: 07/12/2004
Name: BILOXI (CADET POINT), BILOXI BAY
MS
NOAA Chart: 11373 Latitude: 30° 23.4' N ( 30.39000)
USGS Quad: OCEAN SPRINGS Longitude: 88° 51.4' W ( -88.85670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3735 C 1979
DESIGNATION: 874 3735 C
MONUMENTATION: Tidal Station disk VM#: 11140
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 23.4' N ( 30.39000) LONGITUDE: 88° 51.4' W ( -88.85670)
The bench mark is a disk located SW of the Marine Education Center, 148 m (485
ft) north of the GCRL pier, 61 m (201 ft) west of bench mark NO 2 RESET 1976,
4.11 m (13.5 ft) SE of the eleventh concrete abutment on the walkway separating
Marine Education Center and Gulf Marine State Park, and 1.83 m (6.0 ft) WSW of
an asphalt roadway landing under the wooden walkway. The bench mark is set 9 cm
(0.3 ft) below ground level and crimped to the top of a stainless steel rod
driven 15.2 m (50 ft) to refusal.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8743735 PUBLICATION DATE: 07/12/2004
Name: BILOXI (CADET POINT), BILOXI BAY
MS
NOAA Chart: 11373 Latitude: 30° 23.4' N ( 30.39000)
USGS Quad: OCEAN SPRINGS Longitude: 88° 51.4' W ( -88.85670)
T I D A L D A T U M S
Tidal datums at BILOXI (CADET POINT), BILOXI BAY based on:
LENGTH OF SERIES: 7 YEARS
TIME PERIOD: January 1980 - December 1986
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8729840 PENSACOLA, PENSACOLA BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (05/31/1988) = 2.498
MEAN HIGHER HIGH WATER MHHW = 0.537
MEAN HIGH WATER MHW = 0.505
MEAN SEA LEVEL MSL = 0.270
MEAN TIDE LEVEL MTL = 0.269
North American Vertical Datum NAVD88 = 0.115
MEAN LOW WATER MLW = 0.033
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (12/24/1983) = -1.132
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 1 1966 3.823 3.318
NO 3 1966 1.194 0.689
NO 4 1969 1.383 0.878
NO 2 RESET 1976 1.185 0.680
3735 B 1979 1.797 1.292
3735 C 1979 1.702 1.197
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8743735 PUBLICATION DATE: 07/12/2004
Name: BILOXI (CADET POINT), BILOXI BAY
MS
NOAA Chart: 11373 Latitude: 30° 23.4' N ( 30.39000)
USGS Quad: OCEAN SPRINGS Longitude: 88° 51.4' W ( -88.85670)
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.