U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 11/04/1995
Station ID: 8728757 SUPERCEDED DATE: 04/21/2003
Name: HUCKLEBERRY LANDING, JACKSON RIVER
FLORIDA
NOAA Chart: 11401 Latitude: 29° 46.2' N
USGS Quad: JACKSON RIVER Longitude: 85° 5.1' W
To reach the tidal bench marks from the Franklin County Courthouse in
Apalachicola, go 6.6 miles (10.6 km) west on U.S. Highway 98 to the junction of
State Route S-385, 0.9 mile (1.4 km) north on State Route S-385 to the railroad
tracks, across tracks on the dirt road 1.3 miles (2.1 km) to the fork in the
road and gate to Box R ranch, take the right fork 0.4 mile (0.6 km) to a second
road fork, then take right fork 0.6 mile (1.0 km) to the catwalk on the Jackson
River. The bench marks are along the dirt road leading to the gage site, and
the gage and staff were at the end of the 48-foot (15 m) catwalk extending into
the Jackson River.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8757 A 1977
MONUMENTATION: Survey Disk VM#: 9873
AGENCY: PID#: AS0879
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set flush in the top of a concrete monument, 39.0 feet (11.9
m) west of the center of the gate to the concrete boat ramp, 7.1 feet (2.2 m)
south of the fence line, 1.6 feet (0.5 m) south of a metal witness post, and
level with the ground.
BENCH MARK STAMPING: 8757 B 1977
MONUMENTATION: Survey Disk VM#: 9874
AGENCY: PID#: AS0878
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is 206 feet (63 m) south of Bench Mark 8757 A 1977, 13.8 feet
(4.2 m) west of the centerline of the dirt road leading to the gage site, and
0.5 foot (0.2 m) east of a metal witness post. The bench mark is crimped to the
top of a copper-clad steel rod driven 40 feet (12 m) to refusal, and encased in
a 4-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 11/04/1995
Station ID: 8728757 SUPERCEDED DATE: 04/21/2003
Name: HUCKLEBERRY LANDING, JACKSON RIVER
FLORIDA
NOAA Chart: 11401 Latitude: 29° 46.2' N
USGS Quad: JACKSON RIVER Longitude: 85° 5.1' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8757 C 1977
MONUMENTATION: Survey Disk VM#: 9875
AGENCY: PID#: AS0877
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is 222.5 feet (67.8 m) south of Bench Mark 8757 B 1977, 21.8 feet
(6.6 m) east of the centerline of the dirt road, and 1.0 foot (0.3 m) west of a
metal witness post. The bench mark is crimped to the top of a copper-clad steel
rod driven 40 feet (12 m) to refusal, encased in a 4-inch PVC pipe and concrete
kickblock.
BENCH MARK STAMPING: 8757 D 1977
MONUMENTATION: Survey Disk VM#: 9876
AGENCY: PID#: AS0876
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is 227.8 feet (69.4 m) south of Bench Mark 8757 C 1977, 25.0 feet
(7.6 m) east of the centerline of the dirt road, and 0.5 foot (0.2 m) west of a
metal witness post. The bench mark is crimped to the top of a copper-clad steel
rod driven 40 feet (12 m) to refusal, encased in a 4-inch PVC pipe and concrete
kickblock.
BENCH MARK STAMPING: 8757 E 1977
MONUMENTATION: Survey Disk VM#: 9877
AGENCY: PID#: AS0875
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set flush in the top of a concrete monument, 285.5 feet (87.0
m) south of Bench Mark 8757 D 1977, 26.1 feet (8.0 m) west of the centerline of
the dirt road, 2.5 feet (0.8 m) east of a metal witness post, and level with the
ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 11/04/1995
Station ID: 8728757 SUPERCEDED DATE: 04/21/2003
Name: HUCKLEBERRY LANDING, JACKSON RIVER
FLORIDA
NOAA Chart: 11401 Latitude: 29° 46.2' N
USGS Quad: JACKSON RIVER Longitude: 85° 5.1' W
T I D A L D A T U M S
Tidal datums at HUCKLEBERRY LANDING, JACKSON RIVER based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: JUNE-AUGUST 1977
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8728360 TURKEY POINT
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (09/03/1977) = 2.41
MEAN HIGHER HIGH WATER MHHW = 1.23
MEAN HIGH WATER MHW = 1.10
MEAN TIDE LEVEL MTL = 0.75
MEAN LOW WATER MLW = 0.39
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (10/13/1977) = -0.88
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
8757 A 1977 3.12 2.02
8757 B 1977 2.74 1.64
8757 C 1977 2.40 1.30
8757 D 1977 3.64 2.54
8757 E 1977 4.05 2.95
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 11/04/1995
Station ID: 8728757 SUPERCEDED DATE: 04/21/2003
Name: HUCKLEBERRY LANDING, JACKSON RIVER
FLORIDA
NOAA Chart: 11401 Latitude: 29° 46.2' N
USGS Quad: JACKSON RIVER Longitude: 85° 5.1' 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.