U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 08/01/1984
Station ID: 8727471 SUPERCEDED DATE: 04/21/2003
Name: WACCASASSA RIVER MOUTH
FLORIDA
NOAA Chart: 11408 Latitude: 29° 9.0' N
USGS Quad: WACCASASSA BAY Longitude: 82° 48.5' W
To reach the tidal bench marks by boat from landing on Weak Ivy Creek 3 miles (5
km) south of Gulf Hammock, proceed downstream to the mouth of the Waccasassa
River. The bench marks are located on Lone Cedar Island (local name) and across
the river on Waccasassa Point. The tide gage and staff were located on a
platform near the west shore of the river.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7471 A 1978
MONUMENTATION: Survey Disk VM#: 8196
AGENCY: PID:
SETTING CLASSIFICATION: Unspecified Steel Rod
The bench mark is 160.0 feet (48.8 m) north of Bench Mark WACCA AZIMUTH 1934,
9.0 feet (2.7 m) SE of a lone palm tree at the edge of Lone Cedar Island, 3 feet
(1 m) south of waters edge, and 1.9 feet (0.6 m) north of a metal witness sign.
The bench amrk is crimped to a steel rod driven 12 feet (4 m) to refusal and
encased in PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 7471 B 1978
MONUMENTATION: Survey Disk VM#: 8197
AGENCY: PID:
SETTING CLASSIFICATION: Unspecified Steel Rod
The bench mark is on Lone Cedar Island, 175 feet (53 m) SE of Bench Mark WACCA
AZIMUTH 1934, 24 feet (7 m) NE of the waters edge, 21 feet (6 m) SW of the NE
waters edge, and 1.5 feet (0.5 m) west of a witness post. The bench mark is
crimped to a steel rod driven 12 feet (4 m) to refusal and encased in PVC pipe
and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 08/01/1984
Station ID: 8727471 SUPERCEDED DATE: 04/21/2003
Name: WACCASASSA RIVER MOUTH
FLORIDA
NOAA Chart: 11408 Latitude: 29° 9.0' N
USGS Quad: WACCASASSA BAY Longitude: 82° 48.5' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: WACCA AZIMUTH 1934
MONUMENTATION: Survey Disk VM#: 8198
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Post
The bench mark is 175.0 feet (53.3 m) NW of Bench Mark 7471 B 1978, 160.0 feet
(48.8 m) south of Bench Mark 7471 A 1978, 45.0 feet (13.7 m) south of a lone
palm tree, 1.8 feet (0.5 m) west of a metal witness post, and set in a concrete
post.
BENCH MARK STAMPING: WACCA RM NO 1 1934
MONUMENTATION: Survey Disk VM#: 8199
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Post
The bench mark is 148 feet (45 m) north from Bench Mark WACCA GLA 1934, 30 feet
(9 m) from the waters edge, 20 feet (6 m) west of the east edge of the marsh,
and set in a concrete post 0.3 foot (0.1 m) above ground level.
BENCH MARK STAMPING: WACCA GLA 1934
MONUMENTATION: Survey Disk VM#: 8200
AGENCY: PID#: AR1549
SETTING CLASSIFICATION: Concrete Post
The bench mark is on the NW bank of the Waccasassa River at its mouth, on the
first point on the NW bank just west of the Lone Cedar Island, 0.5 mile (0.8 km)
north of Waccasassa Point, 20 feet (6 m) from the waters edge, 20 feet (6 m)
east of the marsh, south of a bunch of spanish needles, and set in a concrete
post 0.5 foot (0.2 m) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 08/01/1984
Station ID: 8727471 SUPERCEDED DATE: 04/21/2003
Name: WACCASASSA RIVER MOUTH
FLORIDA
NOAA Chart: 11408 Latitude: 29° 9.0' N
USGS Quad: WACCASASSA BAY Longitude: 82° 48.5' W
T I D A L D A T U M S
Tidal datums at WACCASASSA RIVER MOUTH based on:
LENGTH OF SERIES: 6 MONTHS
TIME PERIOD: JULY-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 (01/20/1979) = 5.57
MEAN HIGHER HIGH WATER MHHW = 3.69
MEAN HIGH WATER MHW = 3.34
MEAN TIDE LEVEL MTL = 1.91
MEAN LOW WATER MLW = 0.48
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (12/28/1978) = -1.62
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
7471 A 1978 5.74 2.40
7471 B 1978 5.87 2.53
WACCA AZIMUTH 1934 4.92 1.58
WACCA RM NO 1 1934 3.98 0.64
WACCA GLA 1934 5.22 1.88
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 08/01/1984
Station ID: 8727471 SUPERCEDED DATE: 04/21/2003
Name: WACCASASSA RIVER MOUTH
FLORIDA
NOAA Chart: 11408 Latitude: 29° 9.0' N
USGS Quad: WACCASASSA BAY Longitude: 82° 48.5' 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.