U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
Station ID: 8727809 PUBLICATION DATE: 04/06/2012
Name: DEKLE BEACH
FL
NOAA Chart: 11407 Latitude: 29° 50.7' N ( 29.84500)
USGS Quad: CROSS CITY Longitude: 83° 37.3' W ( -83.62170)
To reach the tidal bench marks from the intersection of U.S. 19 and County Road
C-361 4.2 km (2.6 mi) south of Perry, proceed south on County Road C-361 for
24.5 km (15.2 mi) to County Road C-361A, then SW on County Road C-361A for 2.7
km (1.7 mi) to its intersection with County Road C-361B, then right and continue
on County Road C-361A for 0.3 km (0.2 mi) to Dekle Beach. The bench marks are
along County Road C-361A and in the vicinity of Dekle Beach Pier. The tide gage
and staff were located on the offshore end of Dekle Beach Pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7809 A 1978
DESIGNATION: 872 7809 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 8244
AGENCY: National Ocean Survey (NOS) IDB PID#: AR1705
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 29° 50.9' N ( 29.84830) LONGITUDE: 83° 37.1' W ( -83.61830)
The primary bench mark is a disk set in the top of a concrete monument north of
the pier, 34 m (110 ft) NNW of the NW corner of the wooden sea wall, 30 m (100
ft) NW of the NE corner of a store at the shore end of the pier, 10 m (34 ft)
SSW of the SW corner of the third wood house from the south end of the beach, 6
m (19 ft) NE of a wood sea wall, 0.30 m (1.0 ft) NW of a power pole with a
witness sign, and 0.3 m (0.1 ft) below ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
Station ID: 8727809 PUBLICATION DATE: 04/06/2012
Name: DEKLE BEACH
FL
NOAA Chart: 11407 Latitude: 29° 50.7' N ( 29.84500)
USGS Quad: CROSS CITY Longitude: 83° 37.3' W ( -83.62170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7809 B 1978
DESIGNATION: 872 7809 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 8245
AGENCY: National Ocean Survey (NOS) IDB PID#: AR1704
SETTING CLASSIFICATION: Concrete monument OPUS PID#: AR1704
LATITUDE: 29° 50.9' N ( 29.84830) LONGITUDE: 83° 37.1' W ( -83.61830)
The bench mark is a disk set in the top of a concrete monument, 30 m (100 ft)
ENE of the NW corner of the wooden sea wall, 8 m (25 ft) WSW of the intersection
of County Road C-361A and the road that runs along the beach, 1 m (3 ft) SE of a
telephone booth, 0.46 m (1.5 ft) NE of a witness sign nailed to the northernmost
of two posts for a Private Area Dekle Beach Inc. sign, and level with the
ground.
BENCH MARK STAMPING: 7809 C 1978
DESIGNATION: 872 7809 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 8246
AGENCY: National Ocean Survey (NOS) IDB PID#: AR1703
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 29° 51.0' N ( 29.85000) LONGITUDE: 83° 37.1' W ( -83.61830)
The bench mark is a disk set in the top of a concrete monument 91 m (300 ft) ENE
of bench mark 7809 B 1978, 8.53 m (28.0 ft) NW of the intersection of County
Road C-361A and the second road west of the beach that runs north and south,
0.61 m (2.0 ft) SSE of a power pole with a witness sign, and 0.03 m (0.1 ft)
below ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
Station ID: 8727809 PUBLICATION DATE: 04/06/2012
Name: DEKLE BEACH
FL
NOAA Chart: 11407 Latitude: 29° 50.7' N ( 29.84500)
USGS Quad: CROSS CITY Longitude: 83° 37.3' W ( -83.62170)
T I D A L D A T U M S
Tidal datums at DEKLE BEACH based on:
LENGTH OF SERIES: 5 MONTHS
TIME PERIOD: November 1978 - March 1979
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8727695 STEINHATCHEE
Elevations of tidal datums referred to Mean High Water (MHW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.081
MEAN HIGH WATER MHW = 0.000
North American Vertical Datum NAVD88 = -0.449
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MHW
7809 A 1978 0.734
7809 B 1978 0.712
7809 C 1978 0.627
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
Station ID: 8727809 PUBLICATION DATE: 04/06/2012
Name: DEKLE BEACH
FL
NOAA Chart: 11407 Latitude: 29° 50.7' N ( 29.84500)
USGS Quad: CROSS CITY Longitude: 83° 37.3' W ( -83.62170)
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.