U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 03/19/1986
Station ID: 8723748 SUPERCEDED DATE: 04/21/2003
Name: TAVERNIER CREEK, HAWK CHANNEL
FLORIDA
NOAA Chart: 11463 Latitude: 25° 0.2' N
USGS Quad: TAVERNIER Longitude: 80° 31.8' W
To reach the tidal bench marks from the post office in Layton, proceed 1.3 miles
(2.1 km) NE on U.S. Highway 1 to highway bridge number 32 A which crosses
Tavernier Creek. The bench marks are near the NE end of the bridge. The tide
gage and staff were located on pilings supporting a pipeline at the NE end of
the bridge.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING:
MONUMENTATION: VM#: 6008
AGENCY: PID#: AC4637
SETTING CLASSIFICATION:
BENCH MARK STAMPING: E 276 1966
MONUMENTATION: Survey Disk VM#: 6005
AGENCY: PID#: AC1193
SETTING CLASSIFICATION: Concrete Abutment
The bench mark is 16.0 feet (4.9 m) north of the centerline of the highway, 1.5
feet (0.5 m) above the level of the highway, and set in the top of the north end
of the east concrete abutment of the highway bridge over Tavernier Creek.
BENCH MARK STAMPING: DOT 90 75 A23
MONUMENTATION: Survey Disk VM#: 6006
AGENCY: PID:
SETTING CLASSIFICATION: Unspecified
The bench mark is 94.0 feet (28.3 m) NE of Bench Mark E 276 1966, 23.6 feet (7.2
m) NW of the centerline of U.S. Highway 1, 19.5 feet (5.9 m) SW of Bench Mark NO
1 1975, 5.5 feet (1.7 m) SE of a Florida DOT witness sign, and is level with the
ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 03/19/1986
Station ID: 8723748 SUPERCEDED DATE: 04/21/2003
Name: TAVERNIER CREEK, HAWK CHANNEL
FLORIDA
NOAA Chart: 11463 Latitude: 25° 0.2' N
USGS Quad: TAVERNIER Longitude: 80° 31.8' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 1 1975
MONUMENTATION: Survey Disk VM#: 6007
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Pad
The bench mark is 30 feet (9 m) NW of the centerline of U.S. Highway 1, 19.5
feet (5.9 m) NE of Bench Mark DOT 90 75 A23, and is set flush in the concrete
manhole pad of the Florida Keys Electric Co-op.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 03/19/1986
Station ID: 8723748 SUPERCEDED DATE: 04/21/2003
Name: TAVERNIER CREEK, HAWK CHANNEL
FLORIDA
NOAA Chart: 11463 Latitude: 25° 0.2' N
USGS Quad: TAVERNIER Longitude: 80° 31.8' W
T I D A L D A T U M S
Tidal datums at TAVERNIER CREEK, HAWK CHANNEL based on:
LENGTH OF SERIES: 69 HIGHS & 70 LOWS
TIME PERIOD: FEBRUARY 11-MARCH 18, 1975
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8724580 KEY WEST
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (02/25/1975) = 1.96
MEAN HIGHER HIGH WATER MHHW = 1.59
MEAN HIGH WATER MHW = 1.47
MEAN TIDE LEVEL MTL = 0.81
MEAN LOW WATER MLW = 0.15
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (02/27/1975) = -0.02
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
0 0.00 0.00
E 276 1966 17.36 15.89
DOT 90 75 A23 13.98 12.51
NO 1 1975 11.71 10.24
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 03/19/1986
Station ID: 8723748 SUPERCEDED DATE: 04/21/2003
Name: TAVERNIER CREEK, HAWK CHANNEL
FLORIDA
NOAA Chart: 11463 Latitude: 25° 0.2' N
USGS Quad: TAVERNIER Longitude: 80° 31.8' 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.