U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 01/19/1990
Station ID: 8728488 SUPERCEDED DATE: 04/21/2003
Name: SOUTH CARRABELLE BEACH, ST GEORGE SOUND
FLORIDA
NOAA Chart: 11405 Latitude: 29° 48.1' N
USGS Quad: CARRABELLE Longitude: 84° 44.2' W
To reach the tidal bench marks from the post office in Carrabelle, proceed 6.0
miles (9.7 km) SW along U.S. Highway 98/319 to the residence of Russell Sinks.
The bench marks are on the property and west along the highway. The tide gage
and staff were on the private dock of Mr. Sinks.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8488 B 1977
MONUMENTATION: Survey Disk VM#: 9839
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set flush in the top of a concrete monument on the NW side of
the highway, about 325 feet (99 m) SW of the drive to Mr. Sinks house, 85 feet
(26 m) west of utility pole #58X616R, 69 feet (21 m) SW of utility anchor pole
#58X1488R, 8 feet (2 m) SE of a witness post, 2 feet (1 m) below highway level,
and 1.2 feet (0.4 m) below ground level.
BENCH MARK STAMPING: S 293 1967
MONUMENTATION: Survey Disk VM#: 9838
AGENCY: PID#: AS0213
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set flush in the top of a concrete monument, 0.2 mile (0.3 km)
NE of a 15-foot (5 m) concrete bridge over a small stream, 308 feet (94 m) SW of
Bench Mark 8488 D 1977, 37 feet (11 m) NW of the centerline of the highway, 4
feet (1 m) west of utility anchor pole #58X1484R, 1.3 feet (0.4 m) NE of a
witness post, 1 foot (0.3 m) below highway level, and 0.5 foot (0.2 m) above
ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 01/19/1990
Station ID: 8728488 SUPERCEDED DATE: 04/21/2003
Name: SOUTH CARRABELLE BEACH, ST GEORGE SOUND
FLORIDA
NOAA Chart: 11405 Latitude: 29° 48.1' N
USGS Quad: CARRABELLE Longitude: 84° 44.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8488 C 1977
MONUMENTATION: Survey Disk VM#: 9840
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set flush in the top of a concrete monument, 406 feet (124 m)
SW of Bench Mark 8488 B 1977, 65 feet (20 m) east of utility pole #58X2513R, 28
feet (9 m) NE of utility pole #58X1380R, 23.5 feet (7.2 m) SE of the centerline
of the highway, 2.7 feet (0.8 m) NW of a witness post, 2 feet (1 m) below
highway level, and 1 foot (0.3 m) below ground level.
BENCH MARK STAMPING: 8488 D 1977
MONUMENTATION: Survey Disk VM#: 9841
AGENCY: PID:
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is 445 feet (136 m) SW of Bench Mark 8488 C 1977, 140 feet (43 m)
east of utility pole #58X2523R, 75.5 feet (23.0 m) west of utility pole
#58X1486R, 25 feet (8 m) NW of the centerline of the highway, 1 foot (0.3 m) SE
of a witness post, and 1 foot (0.3 m) below highway level. The bench mark is at
ground level, crimped to a copper-clad steel rod driven 40 feet (12 m), and
encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 01/19/1990
Station ID: 8728488 SUPERCEDED DATE: 04/21/2003
Name: SOUTH CARRABELLE BEACH, ST GEORGE SOUND
FLORIDA
NOAA Chart: 11405 Latitude: 29° 48.1' N
USGS Quad: CARRABELLE Longitude: 84° 44.2' W
T I D A L D A T U M S
Tidal datums at SOUTH CARRABELLE BEACH, ST GEORGE SOUND based on:
LENGTH OF SERIES: 6 MONTHS
TIME PERIOD: DECEMBER 1977-MAY 1978
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8728360 TURKEY POINT
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (05/04/1978) = 3.78
MEAN HIGHER HIGH WATER MHHW = 2.49
MEAN HIGH WATER MHW = 2.27
MEAN TIDE LEVEL MTL = 1.45
MEAN LOW WATER MLW = 0.63
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (11/11/1977) = -2.09
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
8488 B 1977 8.44 6.17
S 293 1967 25.20 22.93
8488 C 1977 8.75 6.48
8488 D 1977 22.12 19.85
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 01/19/1990
Station ID: 8728488 SUPERCEDED DATE: 04/21/2003
Name: SOUTH CARRABELLE BEACH, ST GEORGE SOUND
FLORIDA
NOAA Chart: 11405 Latitude: 29° 48.1' N
USGS Quad: CARRABELLE Longitude: 84° 44.2' 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.