U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
Station ID: 8728464 PUBLICATION DATE: 07/31/2009
Name: CARRABELLE RIVER, ST. GEORGE SOUND
FL
NOAA Chart: 11405 Latitude: 29° 51.0' N ( 29.85000)
USGS Quad: CARRABELLE Longitude: 84° 39.9' W ( -84.66500)
To reach the tidal bench marks from the Carrabelle Post Office, proceed south on
State Road S-67 (Marine Street) for 0.2 km (0.1 mi) to Rileys Bait and Tackle
shop. The bench marks are along State Road S-67 from Avenue B South to Avenue C
North. The tide gage and staff were located on the dock behind Rileys Bait and
Tackle shop.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8464 A 1977
DESIGNATION: 872 8464 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 9828
AGENCY: Florida Department of Natural Resources
(FLDNR) IDB PID#: AI3229
SETTING CLASSIFICATION: Concrete driveway OPUS PID:
LATITUDE: 29° 51.2' N ( 29.85333) LONGITUDE: 84° 39.9' W ( -84.66500)
The primary bench mark is a disk set flush in the concrete apron between the
doors of the Carrabelle Fire Department, 15.06 m (49.4 ft) west of the
centerline of State Road S-67, 14.63 m (48.0 ft) NW of powerline pole #
5-11349; 9.57 m (31.4 ft) south of the NE corner of the station, and 5.06 m
(16.6 ft) north of the SE corner of fire house.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 8728464 PUBLICATION DATE: 07/31/2009
Name: CARRABELLE RIVER, ST. GEORGE SOUND
FL
NOAA Chart: 11405 Latitude: 29° 51.0' N ( 29.85000)
USGS Quad: CARRABELLE Longitude: 84° 39.9' W ( -84.66500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8464 B 1977
DESIGNATION: 872 8464 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 9829
AGENCY: Florida Department of Transportation
(FLDT) IDB PID#: AI3230
SETTING CLASSIFICATION: Concrete monumet OPUS PID:
LATITUDE: 29° 51.2' N ( 29.85330) LONGITUDE: 84° 39.9' W ( -84.66500)
The bench mark is a disk set in the top of a concrete monument flush with the
ground located 20.12 m (66.0 ft) NW of the NW corner of a house, 10.06 m (33.0
ft) east of the centerline of County Road 67, 3.96 m (13.0 ft) SW of the SW
corner of a house, 0.91 m (3.0 ft) above the level of the road, and 0.76 m (2.5
ft) east of a concrete wall.
BENCH MARK STAMPING: 8464 C 1977
DESIGNATION: 872 8464 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 9830
AGENCY: Florida Department of Transportation
(FLDT) IDB PID#: AI3231
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 29° 51.3' N ( 29.85500) LONGITUDE: 84° 39.9' W ( -84.66500)
The bench mark is a disk located 0.3 km (0.2 mi) north on Highway S-67 from the
Carrabelle Post Office, 10.67 m (35.0 ft) south of the centerline of Avenue C
North, 9.20 m (30.2 ft) east of the NE corner of Riley's Funeral Home, 7.62 m
(25.0 ft) west of the centerline of State Road S-67, and 1.37 m (4.5 ft) south
of powerline pole # 58X-805. The bench mark is set 0.15 m (0.5 ft) below ground
level, crimped to the top of a copper-clad steel rod driven 12.2 m (40 ft), 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 8
Station ID: 8728464 PUBLICATION DATE: 07/31/2009
Name: CARRABELLE RIVER, ST. GEORGE SOUND
FL
NOAA Chart: 11405 Latitude: 29° 51.0' N ( 29.85000)
USGS Quad: CARRABELLE Longitude: 84° 39.9' W ( -84.66500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: P 293 1967
DESIGNATION: P 293
MONUMENTATION: Survey disk VM#: 9831
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AS0228
SETTING CLASSIFICATION: Building OPUS PID:
LATITUDE: 29° 51.1' N ( 29.85170) LONGITUDE: 84° 39.9' W ( -84.66500)
The bench mark is a disk set vertically in the south brick face, near the SW
corner of the Carabelle Post Office building, 31.70 m (104.0 ft) west of the
centerline of State Road S-67, 19.81 m (65.0 ft) north of the centerline of U.S.
Highways 319/98, 0.49 m (1.6 ft) east of the SW corner of the Post Office, and
level with the highway.
BENCH MARK STAMPING: NO 2 TIDAL
DESIGNATION: 872 8464 TIDAL 2
MONUMENTATION: Tidal Station disk VM#: 9832
AGENCY: National Ocean Survey (NOS) IDB PID#: AS0230
SETTING CLASSIFICATION: Concrete sidewalk OPUS PID:
LATITUDE: 29° 51.1' N ( 29.85170) LONGITUDE: 84° 39.9' W ( -84.66500)
The bench mark is a disk set in a concrete sidewalk about 61 m (200 ft) south of
the intersection of U.S. Highway 319/98 and State Highway S-67, 7.62 m (25.0 ft)
south of the SE corner of a board-and-batten building housing the Florida Power
and Light Company, 1.89 m (6.2 ft) west of the west curb of State Road S-67,
16.15 m (53.0 ft) north of the NE corner of a concrete block building, and level
with the road. Note: The bench mark stamping is obliterated.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 8728464 PUBLICATION DATE: 07/31/2009
Name: CARRABELLE RIVER, ST. GEORGE SOUND
FL
NOAA Chart: 11405 Latitude: 29° 51.0' N ( 29.85000)
USGS Quad: CARRABELLE Longitude: 84° 39.9' W ( -84.66500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: N 293 1967
DESIGNATION: N 293
MONUMENTATION: Bench Mark disk VM#: 19005
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AS0233
SETTING CLASSIFICATION: Concrete Fire Tower Base OPUS PID:
LATITUDE: 29° 51.1' N ( 29.85170) LONGITUDE: 84° 38.6' W ( -84.64333)
The bench mark is a disk set on the top of concrete base to the SW steel leg of
the tower, located approximately 45.72 m (150.0 ft) west of the junction of
State Highway 30 at the Franklin County Fire Control Tower, 32.00 m (105 ft) NW
of the centerline of the highway, and 0.91 m (3.0 ft) above the level of the
highway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 8728464 PUBLICATION DATE: 07/31/2009
Name: CARRABELLE RIVER, ST. GEORGE SOUND
FL
NOAA Chart: 11405 Latitude: 29° 51.0' N ( 29.85000)
USGS Quad: CARRABELLE Longitude: 84° 39.9' W ( -84.66500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: A 293 1967
DESIGNATION: A 293
MONUMENTATION: Bench Mark disk VM#: 19006
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AS0231
SETTING CLASSIFICATION: Copper Clad Steel Rod OPUS PID:
LATITUDE: 29° 51.0' N ( 29.85000) LONGITUDE: 84° 39.7' W ( -84.66167)
The bench mark is a disk located near the junction of 3rd Street East, near the
NW corner of a steel fence around a small micro wave tower, 42.67 m (140.0 ft)
north of the center line of the highway, 12.80 m (42.0 ft) east of the center
line of the street, 1.83 m (6.0 ft) north of the NW corner of a 12-foot square
concrete building, 0.91 m (3.0 ft) below the level of the highway, 0.55 m (1.8
ft) south of a fence corner, 0.09 m (0.3 ft) west of the fence line, and 0.12 m
(0.4 ft) south of a metal witness post which is about level with the street.
The bench mark is set 0.03 m (0.1 ft) underground, crimped to the top of a
copper coated steel rod, driven to refusal at a depth of 22.25 m (73 ft), and
protected by a 6-inch metal pipe flush with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 8728464 PUBLICATION DATE: 07/31/2009
Name: CARRABELLE RIVER, ST. GEORGE SOUND
FL
NOAA Chart: 11405 Latitude: 29° 51.0' N ( 29.85000)
USGS Quad: CARRABELLE Longitude: 84° 39.9' W ( -84.66500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8464 D 2007
DESIGNATION: 872 8464 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 19007
AGENCY: Florida Dept of Environ Protection
(FLDEP) IDB PID#:
SETTING CLASSIFICATION: Manhole Base OPUS PID:
LATITUDE: 29° 51.1' N ( 29.85170) LONGITUDE: 84° 39.9' W ( -84.66500)
The bench mark is disk set flush in the SE corner of a concrete base for a sewer
manhole cover located in the driveway of the southernmost building of the
Carrabelle Fire Department and level with the road surface, located 14.69 m
(48.2 ft) SSE of bench mark 8464 A 1997, 7.10 m (23.3 ft) west of the centerline
of county road 67, 3.84 m (12.6 ft) NNW of a wooden power pole (NO. B276608)
with a transformer and street light attached, and 2.71 m (8.9 ft) NNW of a
carsonite witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 8728464 PUBLICATION DATE: 07/31/2009
Name: CARRABELLE RIVER, ST. GEORGE SOUND
FL
NOAA Chart: 11405 Latitude: 29° 51.0' N ( 29.85000)
USGS Quad: CARRABELLE Longitude: 84° 39.9' W ( -84.66500)
T I D A L D A T U M S
Tidal datums at CARRABELLE RIVER, ST. GEORGE SOUND based on:
LENGTH OF SERIES: 4 MONTHS
TIME PERIOD: November 1977 - February 1978
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8728360 TURKEY POINT
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.714
MEAN HIGH WATER MHW = 0.657
MEAN TIDE LEVEL MTL = 0.415
North American Vertical Datum NAVD88 = 0.415
MEAN SEA LEVEL MSL = 0.402
MEAN LOW WATER MLW = 0.172
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
8464 A 1977 4.345 3.688
8464 B 1977 5.530 4.873
8464 C 1977 6.521 5.864
P 293 1967 3.800 3.143
NO 2 TIDAL 4.063 3.406
N 293 1967 5.769 5.112
A 293 1967 3.455 2.798
8464 D 2007 4.180 3.523
Foot Notes:
Bench marks N 293 1967, A 293 1967 and 8464 D 2007 are based on one differential
leveling connection and do not meet the quality control standards of the NOS.
Therefore, caution should be used when deriving elevations for these marks.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 8728464 PUBLICATION DATE: 07/31/2009
Name: CARRABELLE RIVER, ST. GEORGE SOUND
FL
NOAA Chart: 11405 Latitude: 29° 51.0' N ( 29.85000)
USGS Quad: CARRABELLE Longitude: 84° 39.9' W ( -84.66500)
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.