U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8728258 PUBLICATION DATE: 02/01/2005
Name: FIDDLERS POINT
FL
NOAA Chart: 11405 Latitude: 30° 0.9' N ( 30.01500)
USGS Quad: SPRING CREEK Longitude: 84° 22.1' W ( -84.36830)
To reach the tidal bench marks from the Panacea Post Office, proceed 1.3 km (0.8
mi) north on U.S. Highway 98 to the junction of County Road 372A, then SE on
County Road 372A for 4.0 km (2.5 mi) to its end. The bench marks are along the
road. The tide gage and staff were located at the end of a catwalk south of the
end of the road.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8258 B 1976
DESIGNATION: 872 8258 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 9779
AGENCY: Florida Department of Natural Resources
(FLDNR) IDB PID#: BE3981
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID#: BE3981
LATITUDE: 30° 1.0' N ( 30.01670) LONGITUDE: 84° 22.1' W ( -84.36830)
The primary bench mark is a disk located 64 m (210 ft) SSW of bench mark 8258 C
1976, 61 m (200 ft) north of the end of the road, 5.49 m (18.0 ft) west of the
centerline of the road, 5.79 m (19.0 ft) east of the east bank of a tidal
slough, and 0.40 m (1.3 ft) east of a witness post. The bench mark is crimped
to the top of a copper-clad steel rod driven 7.3 m (24 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 6
Station ID: 8728258 PUBLICATION DATE: 02/01/2005
Name: FIDDLERS POINT
FL
NOAA Chart: 11405 Latitude: 30° 0.9' N ( 30.01500)
USGS Quad: SPRING CREEK Longitude: 84° 22.1' W ( -84.36830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8258 A 1976
DESIGNATION: 872 8258 A
MONUMENTATION: Survey disk VM#: 9778
AGENCY: Florida Department of Natural Resources
(FLDNR) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 30° 0.9' N ( 30.01500) LONGITUDE: 84° 22.1' W ( -84.36830)
The bench mark is a disk located 110 m (360 ft) north of the shore line at the
end of the road, 61 m (199 ft) south of Bench Mark 8258 B 1976, 15.09 m (49.5
ft) west of the centerline of road S372A, and 10.00 m (32.8 ft) north of a
cabbage palm. The bench mark is set 0.06 m (0.02 ft) above ground level,
crimped to the top of a copper-clad steel rod driven 9.8 m (32 ft) to refusal,
and encased in a 4-inch diameter PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 8258 C 1976
DESIGNATION: 872 8258 C TIDAL
MONUMENTATION: Bench Mark disk VM#: 9780
AGENCY: Florida Department of Natural Resources
(FLDNR) IDB PID#: BE3980
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 30° 1.1' N ( 30.01830) LONGITUDE: 84° 22.1' W ( -84.36830)
The bench mark is a disk located 122 m (400 ft) north of the end of the road,
64.77 m (212.5 ft) south of bench mark 8258 D 1976, 14.97 m (49.1 ft) east of
the east bank of a tidal slough, 6.10 m (20.0 ft) east of the centerline of the
road, and 0.3 m (1 ft) west of a witness post. The bench mark is crimped to the
top of a copper-clad steel rod driven 7.3 m (24 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 6
Station ID: 8728258 PUBLICATION DATE: 02/01/2005
Name: FIDDLERS POINT
FL
NOAA Chart: 11405 Latitude: 30° 0.9' N ( 30.01500)
USGS Quad: SPRING CREEK Longitude: 84° 22.1' W ( -84.36830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1976
DESIGNATION: 872 8258 TIDAL D 02
ALIAS: D 02 FLDNR
MONUMENTATION: Bench Mark disk VM#: 9781
AGENCY: Florida Department of Natural Resources
(FLDNR) IDB PID#: BE3979
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 1.1' N ( 30.01830) LONGITUDE: 84° 22.1' W ( -84.36830)
The bench mark is a disk set in the top of a concrete monument, 186 m (610 ft)
north of the road, 64.77 m (212.5 ft) north of bench mark 8258 C 1976, 16.03 m
(52.6 ft) SW of a concrete R/W marker at the edge of the road grade, and 6.40 m
(21.0 ft) east of the centerline of the road.
BENCH MARK STAMPING: 8258 E 1976
DESIGNATION: 872 8258 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 9782
AGENCY: Florida Department of Natural Resources
(FLDNR) IDB PID#: BE3978
SETTING CLASSIFICATION: Concrete culvert head wall OPUS PID:
LATITUDE: 30° 1.4' N ( 30.02330) LONGITUDE: 84° 22.1' W ( -84.36830)
The bench mark is a disk set in top of the south end of a concrete culvert head
wall, 0.6 km (0.4 mi) north of the south end of road, and 5.64 m (18.5 ft) west
of the centerline of the road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8728258 PUBLICATION DATE: 02/01/2005
Name: FIDDLERS POINT
FL
NOAA Chart: 11405 Latitude: 30° 0.9' N ( 30.01500)
USGS Quad: SPRING CREEK Longitude: 84° 22.1' W ( -84.36830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8258 F 1986
DESIGNATION: 872 8258 F TIDAL
MONUMENTATION: Bench Mark disk VM#: 16517
AGENCY: National Ocean Service (NOS) IDB PID#: BE3982
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 1.0' N ( 30.01670) LONGITUDE: 84° 22.1' W ( -84.36830)
The bench mark is a disk located at the end of the road, 70.41 m (231.0 ft) SSE
of bench mark 8258 B 1976, 7.25 m (23.8 ft) ESE of the centerline of a boat
ramp, 12.56 m (41.2 ft) south of the center of the turn-around at the end of the
road, 23.29 m (76.4 ft) east of a lone cabbage palm tree, and 0.70 m (2.3 ft)
north of a witness post. The bench mark is crimped to the top of a stainless
steel rod driven 8.5 m (28 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 5 of 6
Station ID: 8728258 PUBLICATION DATE: 02/01/2005
Name: FIDDLERS POINT
FL
NOAA Chart: 11405 Latitude: 30° 0.9' N ( 30.01500)
USGS Quad: SPRING CREEK Longitude: 84° 22.1' W ( -84.36830)
T I D A L D A T U M S
Tidal datums at FIDDLERS POINT based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: September 1976 - September 1976
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8728229 SHELL POINT, WALKER CREEK
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.096
MEAN HIGH WATER MHW = 1.028
MEAN TIDE LEVEL MTL = 0.622
North American Vertical Datum NAVD88 = 0.610
MEAN SEA LEVEL MSL = 0.608
MEAN LOW WATER MLW = 0.216
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
8258 B 1976 1.790 0.762
8258 A 1976 1.551 0.523
8258 C 1976 1.384 0.356
1976 1.317 0.289
8258 E 1976 1.482 0.454
8258 F 1986 1.557 0.529
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8728258 PUBLICATION DATE: 02/01/2005
Name: FIDDLERS POINT
FL
NOAA Chart: 11405 Latitude: 30° 0.9' N ( 30.01500)
USGS Quad: SPRING CREEK Longitude: 84° 22.1' W ( -84.36830)
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.