U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 8728262 PUBLICATION DATE: 07/12/2023
Name: OCHLOCKONEE BAY
FL
NOAA Chart: 11405 Latitude: 29° 58.8' N ( 29.98022)
USGS Quad: SAINT TERESA Longitude: 84° 23.8' W ( -84.39593)
To reach the tidal bench marks from the Post Office in Panacea, FL, proceed 6.6
km (4.1 mi) south on U.S. Highway 98 to County Road C-372, then east on County
Road C-372 for 0.38 km (0.24 mi) to the bridge over Tide Creek. The bench marks
are located along County Road C-372. The tide gage and staff were located on
the concrete retaining wall on the northeast side of the bridge over Tide Creek.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 290841 AC1 1975
DESIGNATION: 290841 AC1 FLDNR
MONUMENTATION: Tidal Station disk VM#: 9790
AGENCY: Florida Department of Natural Resources
(FLDNR) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 29° 58.7' N ( 29.97808) LONGITUDE: 84° 22.6' W ( -84.37656)
The bench mark is a brass disk crimped to a copper clad steel rod, located 25.3
m (83.0 ft) NW of the approximate centerline of a dirt road, 7.5 m (24.6 ft) SW
of the C-372 centerline, 5.0 m (16.4 ft) NNE of power pole number 59v2190R, and
0.6 m (2 ft) NE of a witness post. The bench mark is level with the ground,
crimped to the top of a copper-clad steel rod driven 14.6 m (48 ft), and encased
in a PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 290841 AC2 1975
DESIGNATION: 290841 AC2 FLDNR
MONUMENTATION: Tidal Station disk VM#: 9791
AGENCY: Florida Department of Natural Resources
(FLDNR) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 29° 58.7' N ( 29.97831) LONGITUDE: 84° 22.6' W ( -84.37708)
The bench mark is a brass disk crimped to a copper clad steel rod, located 26.5
m (86.9 ft) south of the eastern gate post to a private drive leading north, 8.6
m (28.2 ft) SW of c-372 centerline, 7.3 m (24.0 ft) SE of a private drive
centerline leading south, and 3.0 m (9.8 ft) east SE of powerpole number
59V-980. The bench mark is set 0.09 m (0.3 ft) above ground, crimped to the top
of a copper-clad steel rod driven 14.6 m (48 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 7
Station ID: 8728262 PUBLICATION DATE: 07/12/2023
Name: OCHLOCKONEE BAY
FL
NOAA Chart: 11405 Latitude: 29° 58.8' N ( 29.98022)
USGS Quad: SAINT TERESA Longitude: 84° 23.8' W ( -84.39593)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 290841 AC4 1975
DESIGNATION: 290841 AC4 FLDNR
MONUMENTATION: Tidal Station disk VM#: 9792
AGENCY: Florida Department of Natural Resources
(FLDNR) IDB PID#:
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 29° 58.7' N ( 29.97878) LONGITUDE: 84° 22.8' W ( -84.37928)
The mark is a brass disk set directly in the concrete seawall north of the
highway bridge, located 7.9 m (25.9 ft) north of the C-372 centerline, 5.1 m
(16.7 ft) WNW of NE bridge abutment, 3.7 m (12.1 ft) north NE of NE most piling
under bridge, and 0.5 m (1.6 ft) east of a seawall edge.
BENCH MARK STAMPING: 290841 AC5 1975
DESIGNATION: 290841 AC5 FLDNR
MONUMENTATION: Tidal Station disk VM#: 9793
AGENCY: Florida Department of Natural Resources
(FLDNR) IDB PID#:
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 29° 58.7' N ( 29.97830) LONGITUDE: 84° 22.8' W ( -84.38000)
The bench mark is a disk set flush in the top of a concrete sea wall on the SE
corner of the County Road C-372 bridge over a tidal creek 0.40 km (0.25 mi) east
of U.S. Highway 98, 13.93 m (45.7 ft) south of bench mark 290841 AC4 1975, 6.00
m (19.7 ft) south of the centerline of county road, 4.69 m (15.4 ft) WNW of the
SE tidal bridge abutment, 2 m (6 ft) SE of the most southeastern piling under
the tidal creek bridge, and 0.24 m (0.8 ft) east of the west sea wall edge.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 8728262 PUBLICATION DATE: 07/12/2023
Name: OCHLOCKONEE BAY
FL
NOAA Chart: 11405 Latitude: 29° 58.8' N ( 29.98022)
USGS Quad: SAINT TERESA Longitude: 84° 23.8' W ( -84.39593)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: BAY 2
DESIGNATION: BAY 2
MONUMENTATION: Bench Mark disk VM#: 24542
AGENCY: FLDEP IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 29° 58.6' N ( 29.97733) LONGITUDE: 84° 23.0' W ( -84.38358)
The bench marks is a desk set in the top of a concrete monument located 15.2 m
(49.9 ft) west of the US 98 centerline, 14.8 m (48.6 ft) NW of the NW corner of
Ochlockonee bay bridge, and 2.3 m (7.5 ft) SE of a 2-foot diameter oak tree.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 8728262 PUBLICATION DATE: 07/12/2023
Name: OCHLOCKONEE BAY
FL
NOAA Chart: 11405 Latitude: 29° 58.8' N ( 29.98022)
USGS Quad: SAINT TERESA Longitude: 84° 23.8' W ( -84.39593)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: Z 633 2020
DESIGNATION: Z 633
MONUMENTATION: Flange-encased Rod VM#: 24543
AGENCY: FLDEP IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: DR6598
LATITUDE: 29° 59.0' N ( 29.98389) LONGITUDE: 84° 23.8' W ( -84.39619)
The bench mark is a stainless steel rod located 16.3 m (53.5 ft) WNW of the
driveway entrance to 2525 county road 372 (surf road), 13.6 m (44.6 ft) ESE of
wooden power pole number 2734008, 9.6 m (31.5 ft) NNE of the approximate
centerline of county road 372 (surf road), 3.0 m (9.8 ft) east of the driveway
entrance to 2519 county road 372 (surf road) and 1.5 m (4.9 ft) south of a
cars0nite witness post. The datum point being the top of a stainless steel rod
driven to a depth of 11.1m (36.4 ft) and 9 cm (4 in) below the level of the logo
cap.
BENCH MARK STAMPING: 8302 C 2020
DESIGNATION: 872 8302 C
MONUMENTATION: Flange-encased Rod VM#: 24544
AGENCY: FLDEP IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: DR6599
LATITUDE: 29° 59.2' N ( 29.98636) LONGITUDE: 84° 24.8' W ( -84.41383)
The bench mark is a stainless steel rod located 46.6 m (152.9 ft) east of the
extended centerline of 2161 county road 372 (surf road), 5.8 m (19.0 ft) west of
a carsonite witness post, 5.6 m (18.4 ft) north of the approximate centerline of
county road 372 (surf road), 3.0 m (9.8 ft) WSW of the SW end of a wood bridge
on a bike trail and 1.7 m (5.6 ft) south of the south side of the bike trail.
The datum point is the top of a stainless steel rod driven to a depth of 15.5m
(50.9) and 9 cm (4 inches) below the level of the (fldep) logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 8728262 PUBLICATION DATE: 07/12/2023
Name: OCHLOCKONEE BAY
FL
NOAA Chart: 11405 Latitude: 29° 58.8' N ( 29.98022)
USGS Quad: SAINT TERESA Longitude: 84° 23.8' W ( -84.39593)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 59 22 A02G
DESIGNATION: 59 22 A02G
MONUMENTATION: Survey disk VM#: 24545
AGENCY: FL DOT IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 29° 59.1' N ( 29.98561) LONGITUDE: 84° 24.5' W ( -84.40850)
The bench mark is a disk set in the top of a concrete monument located 49.7 m
(163.1 ft) east of the eastern most edge of the marina concrete bulkhead located
at the southern most end of the main road bridge of 2161 county road 372 (surf
road), 42.8 m (140.4 ft) west of the corner of the bayside villas condominium
complex wooden fence, 40.2 m (131.9 ft) SE of the northeastern most edge of the
2161 county road 372 (surf road) bridge guardrail, 30.4 m (99.7 ft) west of the
centerline of the eastern most entrance to the bayside marina RV park , 24.7 m
(81.0 ft) east of utility-power pole number 2733957, 19.5 m (64.0 ft) east of a
red fire hydrant on the south side of 2161 county road 372 (surf road), 10.8 m
(35.4 ft) south of the centerline of county road 372 (surf road), 1.5 m (4.9 ft)
north of the wooden fence to the bayside marina RV park, 1.2 m (3.9 ft) north of
a metal orange FL DOT witness-survey marker post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 8728262 PUBLICATION DATE: 07/12/2023
Name: OCHLOCKONEE BAY
FL
NOAA Chart: 11405 Latitude: 29° 58.8' N ( 29.98022)
USGS Quad: SAINT TERESA Longitude: 84° 23.8' W ( -84.39593)
T I D A L D A T U M S
Tidal datums at OCHLOCKONEE BAY based on:
LENGTH OF SERIES: 4 MONTHS
TIME PERIOD: January 2023 - April 2023
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8727520 CEDAR KEY, GULF OF MEXICO
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.983
MEAN HIGH WATER MHW = 0.916
MEAN TIDE LEVEL MTL = 0.547
MEAN SEA LEVEL MSL = 0.535
North American Vertical Datum NAVD88 = 0.516
MEAN LOW WATER MLW = 0.178
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
290841 AC1 1975 2.209 1.293
290841 AC2 1975 2.029 1.113
290841 AC4 1975 2.081 1.165
290841 AC5 1975 2.083 1.167
BAY 2 2.771 1.855
Z 633 2020 2.464 1.548
8302 C 2020 2.108 1.192
59 22 A02G 2.215 1.299
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 8728262 PUBLICATION DATE: 07/12/2023
Name: OCHLOCKONEE BAY
FL
NOAA Chart: 11405 Latitude: 29° 58.8' N ( 29.98022)
USGS Quad: SAINT TERESA Longitude: 84° 23.8' W ( -84.39593)
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.