U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8728351 PUBLICATION DATE: 06/16/2004
Name: OCHLOCKONEE RIVER STATE PARK
FL
NOAA Chart: 11405 Latitude: 30° 0.3' N ( 30.00500)
USGS Quad: SOPCHOPPY Longitude: 84° 28.3' W ( -84.47170)
To reach the tidal bench marks from the post office in Sopchoppy, proceed south
on U.S. Highway 319 for 6 km (4 mi) to the entrance of Ochlockonee River State
Park, then turn left and proceed east along State Park Road for 3.2 km (2.0 mi)
to the swimming area. The bench marks are located along the main park road, the
driveway around the parking lot, and the swimming area. The tide gage and staff
were located on a catwalk attached to a platform at the swimming area.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8351 A 1978
DESIGNATION: 872 8351 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 9808
AGENCY: Florida Department on Natural Resources
(FLDNR) IDB PID#: BE2256
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 30° 0.3' N ( 30.00500) LONGITUDE: 84° 28.3' W ( -84.47170)
The primary bench mark is a disk located in the vicinity of the swimming area,
57 m (188 ft) NE of a NW running dirt drive, 7 m (23 ft) SSW of the shoreline,
6.95 m (22.8 ft) WSW of the west corner of the dock platform, 3 m (9 ft) SE of a
1 m (2 ft) pine tree, and 1 m (3 ft) SE of a witness post. The bench mark is
crimped to the top of a copper-clad steel rod driven 6.7 m (22 ft) to refusal,
and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8728351 PUBLICATION DATE: 06/16/2004
Name: OCHLOCKONEE RIVER STATE PARK
FL
NOAA Chart: 11405 Latitude: 30° 0.3' N ( 30.00500)
USGS Quad: SOPCHOPPY Longitude: 84° 28.3' W ( -84.47170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8351 B 1978
DESIGNATION: 872 8351 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 9809
AGENCY: Florida Department on Natural Resources
(FLDNR) IDB PID#: BE2255
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 0.3' N ( 30.00500) LONGITUDE: 84° 28.3' W ( -84.47170)
The bench mark is a disk set in the top of a concrete monument, 69.07 m (226.6
ft) SW of bench mark 8351 A 1978, 11 m (36 ft) SW of a NW running dirt drive,
5.18 m (17.0 ft) SSE of a SW running dirt drive, 3.81 m (12.5 ft) west of a
double-trunked pinetree, 1.04 m (3.4 ft) NW of a witness post, and 6 cm (0.2 ft)
above the ground.
BENCH MARK STAMPING: 8351 C 1978
DESIGNATION: 872 8351 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 9810
AGENCY: Florida Department on Natural Resources
(FLDNR) IDB PID#: BE2254
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 30° 0.3' N ( 30.00500) LONGITUDE: 84° 28.3' W ( -84.47170)
The bench mark is a disk located in the parking area, 68.49 m (224.7 ft) SSW of
bench mark 8351 B 1978, 9 m (30 ft) NW of a NE running dirt drive, 7 m (23 ft)
SE of a SW running dirt drive, 2 m (6 ft) SE of a 0.3 m (1 ft) diameter cabbage
palm, and 1.31 m (4.3 ft) SW of a witness post. The bench mark is crimped to
the top of a copper-clad steel rod driven 11.2 m (37 ft) to refusal, 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 5
Station ID: 8728351 PUBLICATION DATE: 06/16/2004
Name: OCHLOCKONEE RIVER STATE PARK
FL
NOAA Chart: 11405 Latitude: 30° 0.3' N ( 30.00500)
USGS Quad: SOPCHOPPY Longitude: 84° 28.3' W ( -84.47170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8351 D 1978
DESIGNATION: 872 8351 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 9811
AGENCY: Florida Department on Natural Resources
(FLDNR) IDB PID#: BE2253
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 0.3' N ( 30.00500) LONGITUDE: 84° 28.3' W ( -84.47170)
The bench mark is a disk set in the top of a concrete monument, 99 m (325 ft)
WSW of bench mark 8351 C 1978, 48.92 m (160.5 ft) ESE of the end of the pavement
of State Park Road, 8.75 m (28.7 ft) south of the centerline of the section of
State Park Road running east-west, 7.25 m (23.8 ft) north of a 0.46 m (1.5 ft)
diameter pine tree, 1 m (3 ft) north of a witness post, and 6 cm (0.2 ft) above
the ground.
BENCH MARK STAMPING: 8351 E 1978
DESIGNATION: 872 8351 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 9812
AGENCY: Florida Department on Natural Resources
(FLDNR) IDB PID#: BE2252
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 30° 0.3' N ( 30.00500) LONGITUDE: 84° 28.3' W ( -84.47170)
The bench mark is a disk located along State Park Road, 94.03 m (308.5 ft) WNW
of bench mark 8351 D 1978, 11.73 m (38.5 ft) ESE of a power pole with
transformer numbered 5-237, 9 m (29 ft) north of the centerline of the main park
road, and 0.88 m (2.9 ft) south of a witness post. The bench mark is crimped to
the top of a copper-clad steel rod driven 7.0 m (23 ft) to refusal, and encased
in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8728351 PUBLICATION DATE: 06/16/2004
Name: OCHLOCKONEE RIVER STATE PARK
FL
NOAA Chart: 11405 Latitude: 30° 0.3' N ( 30.00500)
USGS Quad: SOPCHOPPY Longitude: 84° 28.3' W ( -84.47170)
T I D A L D A T U M S
Tidal datums at OCHLOCKONEE RIVER STATE PARK based on:
LENGTH OF SERIES: 7 MONTHS
TIME PERIOD: May 1978 - November 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 = 0.851
MEAN HIGH WATER MHW = 0.787
MEAN TIDE LEVEL MTL = 0.465
MEAN SEA LEVEL MSL = 0.462
North American Vertical Datum NAVD88 = 0.427
MEAN LOW WATER MLW = 0.143
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
8351 A 1978 1.459 0.672
8351 B 1978 1.576 0.789
8351 C 1978 1.980 1.193
8351 D 1978 2.238 1.451
8351 E 1978 2.473 1.686
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8728351 PUBLICATION DATE: 06/16/2004
Name: OCHLOCKONEE RIVER STATE PARK
FL
NOAA Chart: 11405 Latitude: 30° 0.3' N ( 30.00500)
USGS Quad: SOPCHOPPY Longitude: 84° 28.3' W ( -84.47170)
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.