U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8727336 PUBLICATION DATE: 04/29/2004
Name: DIXIE BAY
FL
NOAA Chart: 11409 Latitude: 28° 52.9' N ( 28.88170)
USGS Quad: RED LEVEL Longitude: 82° 38.1' W ( -82.63500)
To reach the tidal bench marks from the intersection of U.S. Highway 19/98 and
Fort Island Trail (State Highway 44), proceed west on Fort Island Trail for 4.0
km (2.5 mi) to its intersection with Dixie Shores Drive, then turn left and
proceed west on Dixie Shores Drive for 1.8 km (1.1 mi) to Bayshore Drive, then
turn right and proceed west on Bayshore Drive for 0.6 km (0.4 mi) to a one story
brick house on the left. The bench marks are located along Bayshore Drive. The
tide gage and staff were located on the dock behind the private brick residence.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7336 B 1978
DESIGNATION: 872 7336 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 7791
AGENCY: National Ocean Survey (NOS) IDB PID#: AL7758
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 28° 52.9' N ( 28.88170) LONGITUDE: 82° 38.1' W ( -82.63500)
The primary bench mark is a disk located inside the curve near the end of
Bayshore Drive, 61.12 m (203.8 ft) NW of bench mark 7336 C 1978, 47.85 m (157.0
ft) SW of the sea wall end of the canal, 5.79 m (19.0 ft) NE of the centerline
of Bayshore Drive, 13.11 m (43.0 ft) NW of the extended centerline of the
driveway to house # 12000, and 1.31 m (4.3 ft) SW of telephone pole # 042 with a
witness sign attached. The bench mark is crimped to the top of a galvanized
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 5
Station ID: 8727336 PUBLICATION DATE: 04/29/2004
Name: DIXIE BAY
FL
NOAA Chart: 11409 Latitude: 28° 52.9' N ( 28.88170)
USGS Quad: RED LEVEL Longitude: 82° 38.1' W ( -82.63500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7336 C 1978
DESIGNATION: 872 7336 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 7792
AGENCY: National Ocean Survey (NOS) IDB PID#: AL7760
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 28° 52.9' N ( 28.88170) LONGITUDE: 82° 38.1' W ( -82.63500)
The bench mark is a disk set in a concrete monument located 102.4 m (336.0 ft)
west of bench mark 7336 D 1978, 34.13 m (112.0 ft) SW of the sea wall of the
canal, 13.72 m (south of the south corner of a stone and stucco house, 6.10 m
(20.0 ft) north of the centerline of Bayshore Drive, 1.68 m (5.5 ft) SSE of
telephone pole # 041, and 0.09 m (0.3 ft) below ground level.
BENCH MARK STAMPING: 7336 D 1978
DESIGNATION: 872 7336 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 7793
AGENCY: National Ocean Survey (NOS) IDB PID#: AL7757
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 28° 52.9' N ( 28.88170) LONGITUDE: 82° 38.0' W ( -82.63330)
The bench mark is a disk located 102.41 m m (336.0 ft) east of bench mark 7336
C 1978, 3.78 m (12.4 ft) SW of the centerline of Bayshore Drive, and 0.91 m (3.0
ft) NE of telephone pole #442408 with a witness sign attatched, on the property
line between house # 11916 and house # 11926. The bench mark is crimped to the
top of a galvanized steel rod driven 4.9 m (16 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 5
Station ID: 8727336 PUBLICATION DATE: 04/29/2004
Name: DIXIE BAY
FL
NOAA Chart: 11409 Latitude: 28° 52.9' N ( 28.88170)
USGS Quad: RED LEVEL Longitude: 82° 38.1' W ( -82.63500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7336 E 1978
DESIGNATION: 872 7336 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 7794
AGENCY: National Ocean Survey (NOS) IDB PID#: AL7756
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 28° 52.8' N ( 28.88000) LONGITUDE: 82° 38.0' W ( -82.63330)
The bench mark is a disk set in a concrete monument located 61.05 m (200.3 ft)
east of bench mark 7336 D 1978, 24.08 m (79.0 ft) SW of the west corner of house
# 11873, 8.84 m (29.0 ft) NW of the centerloine of the driveway to house # 504,
3.96 m (13.0 ft) SW of the centerline of Bayshore Drive, and 0.61 m (2.0 ft)
north of powerline pole #41446 with a witness sign attatched.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8727336 PUBLICATION DATE: 04/29/2004
Name: DIXIE BAY
FL
NOAA Chart: 11409 Latitude: 28° 52.9' N ( 28.88170)
USGS Quad: RED LEVEL Longitude: 82° 38.1' W ( -82.63500)
T I D A L D A T U M S
Tidal datums at DIXIE BAY based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: July 1978 - August 1978
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8727520 CEDAR KEY, GULF OF MEXICO
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.661
MEAN HIGH WATER MHW = 0.579
North American Vertical Datum NAVD88 = 0.373
MEAN TIDE LEVEL MTL = 0.322
MEAN SEA LEVEL MSL = 0.313
MEAN LOW WATER MLW = 0.065
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
7336 B 1978 1.469 0.890
7336 C 1978 1.563 0.985
7336 D 1978 1.598 1.019
7336 E 1978 1.685 1.106
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8727336 PUBLICATION DATE: 04/29/2004
Name: DIXIE BAY
FL
NOAA Chart: 11409 Latitude: 28° 52.9' N ( 28.88170)
USGS Quad: RED LEVEL Longitude: 82° 38.1' W ( -82.63500)
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.