U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 07/03/1984
Station ID: 8728957 SUPERCEDED DATE: 04/21/2003
Name: OVERSTREET, WETAPPO CREEK
FLORIDA
NOAA Chart: 11389 Latitude: 29° 59.8' N
USGS Quad: OVERSTREET Longitude: 85° 22.2' W
To reach the tidal bench marks from the intersection of U.S. Highway 98 and
Highway S386A, proceed north on Highway S386A, 1.1 miles (1.8 km) to its
intersection with Highway S-386, then on S386 proceed 4.6 miles (7.4 km) to the
floating bridge at Overstreet. The bench marks are located along Highway S386
and the tide gage and staff were located on a pier just south of the Overstreet
floating bridge on the east shore of Wetappo Creek.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8957 A 1976
MONUMENTATION: Survey Disk VM#: 9920
AGENCY: PID#: AS0857
SETTING CLASSIFICATION: Concrete Footing
The bench mark is set flush in a concrete footing of the traffic gate on the NE
side of the floating bridge at Overstreet, 29.0 feet (8.8 m) north of the bridge
tenders office, 14.4 feet (4.4 m) north of the centerline of Highway S386, and
14.0 feet (4.3 m) NE of the northernmost corner of the bridge.
BENCH MARK STAMPING: 8957 B 1976
MONUMENTATION: Survey Disk VM#: 9921
AGENCY: PID#: AS0858
SETTING CLASSIFICATION: Copper-Coated Steel Rod
The bench mark is 0.3 mile (0.5 km) east of the floating bridge at Overstreet,
at the NW corner of the Florida Division of forestry grounds, 222 feet (68 m)
WNW of Bench Mark 8957 C 1976, 118 feet (36 m) NW of the NW corner of the
westernmost house, 24.5 feet (7.5 m) south of witness sign nailed to a telephone
pole junction box #M1020, and 22.8 feet (6.9 m) SW of a power pole with a
transformer. The bench mark is 0.6 foot (0.2 m) below ground level crimped to a
copper-coated steel rod driven 58 feet (18 m) 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
PUBLICATION DATE: 07/03/1984
Station ID: 8728957 SUPERCEDED DATE: 04/21/2003
Name: OVERSTREET, WETAPPO CREEK
FLORIDA
NOAA Chart: 11389 Latitude: 29° 59.8' N
USGS Quad: OVERSTREET Longitude: 85° 22.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8957 C 1976
MONUMENTATION: Survey Disk VM#: 9922
AGENCY: PID#: AS0859
SETTING CLASSIFICATION: Concrete Footing
The bench mark is set flush in the SE footing of the lookout tower at the
florida Division of Forestry, 154.5 feet (47.1 m) south of the centerline of
Highway S386, 102.5 feet (31.2 m) ENE of front step of easternmost house, and 34
feet (10 m) east of the centerline of dirt drive leading into grounds.
BENCH MARK STAMPING: 8957 D 1976
MONUMENTATION: Survey Disk VM#: 9923
AGENCY: PID#: AS0860
SETTING CLASSIFICATION: Copper-Coated Steel Rod
The bench mark is at the NE corner of the Florida Division of Forestry grounds,
215 feet (66 m) NE of Bench Mark 8957 C 1976, 125 feet (38 m) NE of the NE
corner of the easternmost house, 39 feet (12 m) south of the centerline of
Highway S386, 8.3 feet (2.5 m) ENE of a pine tree, and 5.3 feet (1.6 m) NW of a
power pole. The bench mark is 0.5 feet (0.2 m) below ground level, crimped to a
copper-coated steel rod driven 40 feet (12 m) 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
PUBLICATION DATE: 07/03/1984
Station ID: 8728957 SUPERCEDED DATE: 04/21/2003
Name: OVERSTREET, WETAPPO CREEK
FLORIDA
NOAA Chart: 11389 Latitude: 29° 59.8' N
USGS Quad: OVERSTREET Longitude: 85° 22.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8957 E 1976
MONUMENTATION: Survey Disk VM#: 9924
AGENCY: PID#: AS0856
SETTING CLASSIFICATION: Copper-Coated Steel Rod
The bench mark is near the west end of the floating bridge at Overstreet, 35.7
feet (10.9 m) west of a Gulf Oil Sign, 32.3 feet (9.8 m) north of the centerline
of Highway S386, 12.5 feet (3.8 m) west of SW corner of the Overstreet General
Store and Post Office, and 1.5 feet (0.5 m) SE of a telephone pole A1 (with a
witness sign). The bench mark is 0.5 feet (0.2 m) below ground level, crimped
to a copper-coated steel rod driven 40 feet (12 m) 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
PUBLICATION DATE: 07/03/1984
Station ID: 8728957 SUPERCEDED DATE: 04/21/2003
Name: OVERSTREET, WETAPPO CREEK
FLORIDA
NOAA Chart: 11389 Latitude: 29° 59.8' N
USGS Quad: OVERSTREET Longitude: 85° 22.2' W
T I D A L D A T U M S
Tidal datums at OVERSTREET, WETAPPO CREEK based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: MAY 1976
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8729015 ALLANTON, EAST BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (05/15/1976) = 2.88
MEAN HIGHER HIGH WATER MHHW = 1.62
MEAN HIGH WATER MHW = 1.48
MEAN TIDE LEVEL MTL = 0.82
MEAN LOW WATER MLW = 0.16
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (05/05/1976) = -0.60
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
8957 A 1976 8.04 6.56
8957 B 1976 9.63 8.15
8957 C 1976 11.04 9.56
8957 D 1976 8.83 7.35
8957 E 1976 9.44 7.96
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 07/03/1984
Station ID: 8728957 SUPERCEDED DATE: 04/21/2003
Name: OVERSTREET, WETAPPO CREEK
FLORIDA
NOAA Chart: 11389 Latitude: 29° 59.8' N
USGS Quad: OVERSTREET Longitude: 85° 22.2' 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.