U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 10/29/1984
Station ID: 8727892 SUPERCEDED DATE: 04/21/2003
Name: FENHOLLOWAY RIVER
FLORIDA
NOAA Chart: 11407 Latitude: 29° 58.8' N
USGS Quad: ROCK ISLANDS Longitude: 83° 47.0' W
To reach the tidal bench marks from the intersection of U.S. Highway 98 and U.S.
Highway 19/ALT 27 in Perry, proceed west on US Highway 98 4.2 miles (6.8 km) to
C356, left (south) on C356 following the paved road 8.6 miles (13.8 km) to the
end of the pavement and a cattle gap, continue on the dirt road 1.5 miles (2.4
km) to a landing on the Fenholloway River, then from the landing by boat south
1.2 miles (1.9 km). The bench marks are located along the east shore around a
landing and the tide gage and staff were located on a free standing structure in
the Fenholloway River, approximately 120 feet (37 m) offshore on the east side
of the river.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7892 A 1978
MONUMENTATION: Survey Disk VM#: 8254
AGENCY: PID:
SETTING CLASSIFICATION: Copper-coated Steel Rod
The bench mark is located on the south end of a strip of semi-aquatic woody
vegetation on the east bank of the Fenholloway River, 65 feet (20 m) SSW of a
palm with a 2-foot (1 m) wide notch around it, 38 feet (12 m) ENE of the edge of
vegetation, 12.3 feet (3.7 m) south of a 0.8 foot (0.3 m) diameter palm with an
X blaze and 5 feet (2 m) south of a witness post. The bench mark is crimped to
a copper-coated steel rod driven to refusal, and encased in a PVC pipe and
concrete kickblock.
BENCH MARK STAMPING: 7892 B 1978
MONUMENTATION: Survey Disk VM#: 8255
AGENCY: PID:
SETTING CLASSIFICATION: Copper-coated Steel Rod
The bench mark is located 165 feet (50 m) NE of Bench Mark 7892 A 1978, 102 feet
(31 m) NE of a palm with a 2-foot (1 m) wide notch around it 15 feet (5 m) off
the ground, 83 feet (25 m) ENE of the vegetation line on the east bank of the
Fenholloway River, 19 feet (6 m) SSW of the south bank of a tidal creek heading
generally east, and 5 feet (2 m) south of a witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 10/29/1984
Station ID: 8727892 SUPERCEDED DATE: 04/21/2003
Name: FENHOLLOWAY RIVER
FLORIDA
NOAA Chart: 11407 Latitude: 29° 58.8' N
USGS Quad: ROCK ISLANDS Longitude: 83° 47.0' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7892 C 1978
MONUMENTATION: Survey Disk VM#: 8256
AGENCY: PID:
SETTING CLASSIFICATION: Copper-coated Steel Rod
The bench mark is located 213 feet (65 m) SE of Bench Mark 7892 A 1978, 202 feet
(62 m) NE of Bench Mark 7892 D 1978, 198 feet (60 m) NW of Bench Mark 7892 E
1978, and 3 feet (1 m) SW of a witness post. The bench mark is crimped to a
copper-coated steel rod driven to refusal, and encased in a PVC pipe and
concrete kickblock.
BENCH MARK STAMPING: 7892 D 1978
MONUMENTATION: Survey Disk VM#: 8257
AGENCY: PID:
SETTING CLASSIFICATION: Copper-coated Steel Rod
The bench mark is located 263 feet (80 m) west of Bench Mark 7892 C 1978, 202
feet (62 m) SW of Bench Mark 7892 C 1978 and 121 feet (37 m) WSW of the east
bank of Fenholloway River. The bench mark is crimped to a copper-coated steel
rod driven to refusal, and encased in a PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 7892 E 1978
MONUMENTATION: Survey Disk VM#: 8258
AGENCY: PID:
SETTING CLASSIFICATION: Copper-coated Steel Rod
The bench mark is located 263 feet (80 m) east of Bench Mark 7892 D 1978, 198
feet (60 m) SE of Bench Mark 7892 C 1978, and 2 feet ( 1 m) SW of a witness
post. The bench mark is crimped to a copper-coated steel rod driven 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 4
PUBLICATION DATE: 10/29/1984
Station ID: 8727892 SUPERCEDED DATE: 04/21/2003
Name: FENHOLLOWAY RIVER
FLORIDA
NOAA Chart: 11407 Latitude: 29° 58.8' N
USGS Quad: ROCK ISLANDS Longitude: 83° 47.0' W
T I D A L D A T U M S
Tidal datums at FENHOLLOWAY RIVER based on:
LENGTH OF SERIES: 7 MONTHS
TIME PERIOD: JUNE THROUGH DECEMBER 1978
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8727520 CEDAR KEY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (01/02/1979) = 5.51
MEAN HIGHER HIGH WATER MHHW = 3.60
MEAN HIGH WATER MHW = 3.33
MEAN TIDE LEVEL MTL = 1.96
MEAN LOW WATER MLW = 0.60
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (12/28/1978) = -0.91
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
7892 A 1978 4.13 0.80
7892 B 1978 3.95 0.62
7892 C 1978 3.64 0.31
7892 D 1978 3.96 0.63
7892 E 1978 3.43 0.10
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 10/29/1984
Station ID: 8727892 SUPERCEDED DATE: 04/21/2003
Name: FENHOLLOWAY RIVER
FLORIDA
NOAA Chart: 11407 Latitude: 29° 58.8' N
USGS Quad: ROCK ISLANDS Longitude: 83° 47.0' 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.