U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8728669 PUBLICATION DATE: 10/30/2003
Name: SIKES CUT,ST.GEORGE ISLAND
FL
NOAA Chart: 11401 Latitude: 29° 36.8' N ( 29.61330)
USGS Quad: NEW INLET Longitude: 84° 57.5' W ( -84.95830)
To reach the tidal bench marks from the public marina in Apalachicola, proceed
by boat south on the main ship channel to can bouy C 1, then on a heading of 160
from the bouy for 4.8 km (3.0 mi) to Sikes Cut. The bench marks are located on
both sides of the cut. The tide gage and staff were located on a three-pile
platform on the west side of the cut 46 m (150 ft) north of the north end of the
rip-rap.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8669 G 1983
DESIGNATION: 872 8669 G TIDAL
MONUMENTATION: Tidal Station disk VM#: 9860
AGENCY: National Ocean Survey (NOS) IDB PID#: AS0555
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 36.8' N ( 29.61330) LONGITUDE: 84° 57.6' W ( -84.96000)
The primary bench mark is a disk located on top of the grass-covered flat on the
west side of Sikes Cut, 13 m (43 ft) west of the embankment of the dredge spoil,
and 0.67 m (2.2 ft) east of a witness post. The bench mark is set 9 cm (0.3 ft)
below ground level, crimped to the top of a stainless steel rod driven 8.53 m
(28.0 ft) to substantial resistance, 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: 8728669 PUBLICATION DATE: 10/30/2003
Name: SIKES CUT,ST.GEORGE ISLAND
FL
NOAA Chart: 11401 Latitude: 29° 36.8' N ( 29.61330)
USGS Quad: NEW INLET Longitude: 84° 57.5' W ( -84.95830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 290844 AA2 1975
DESIGNATION: 872 8669 TIDAL AA 2
MONUMENTATION: Tidal Station disk VM#: 9858
AGENCY: Florida Department of Natural Resources
(FLDNR) IDB PID#: AS0410
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 29° 36.8' N ( 29.61330) LONGITUDE: 84° 57.8' W ( -84.96330)
The bench mark is a disk located in the center of a grove of palm trees, along
the treeline on the west side of the grassy area on the west side of Sikes Cut,
128 m (421 ft) west of bench mark 4980 A17 along the treeline, 3.66 m (12.0 ft)
ENE of a 0.46 m (1.5 ft) diameter pine tree, 2.62 m (8.6 ft) WNW of the
southeastmost palm tree, and 0.34 m (1.1 ft) SE of a witness post. The bench
mark is set 15 cm (0.5 ft) below ground level, crimped to the top of a
copper-clad steel rod driven 10 m (32 ft) to refusal, encased in a PVC pipe and
concrete kickblock.
BENCH MARK STAMPING: 8669 H 1983
DESIGNATION: 872 8669 H TIDAL
MONUMENTATION: Tidal Station disk VM#: 9861
AGENCY: National Ocean Survey (NOS) IDB PID#: AS0554
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 36.9' N ( 29.61500) LONGITUDE: 84° 57.7' W ( -84.96170)
The bench mark is a disk located on top of the grassy flat on the west side of
Sikes Cut, 59.80 m (196.2 ft) NNW of bench mark 8669 G 1983, 48 m (158 ft) ENE
of a lone cabbage palm, 9 m (31 ft) west of an embankment starting the dredge
spoil, and 0.43 m (1.4 ft) ENE of a witness post. The bench mark is set 9 cm
(0.3 ft) below ground level, crimped to the top of a stainless steel rod driven
9.75 m (32.0 ft) to substantial resistance, 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: 8728669 PUBLICATION DATE: 10/30/2003
Name: SIKES CUT,ST.GEORGE ISLAND
FL
NOAA Chart: 11401 Latitude: 29° 36.8' N ( 29.61330)
USGS Quad: NEW INLET Longitude: 84° 57.5' W ( -84.95830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4980 A17
DESIGNATION: 49 80 A17
MONUMENTATION: Bench Mark disk VM#: 9862
AGENCY: Florida Department of Natural Resources
(FLDNR) IDB PID#: AS0553
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 29° 36.8' N ( 29.61330) LONGITUDE: 84° 57.7' W ( -84.96170)
The bench mark is a disk set in top of a concrete monument in the grass-covered
flat, 0.2 km (0.1 mi) west of Sikes Cut, 128 m (421 ft) east of bench mark
290844 AA2 1975, 60 m (196 ft) NW of a vegetation line, 13 m (43 ft) NNW of the
top south edge of the sand dune, 151 m (495 ft) south of bench mark 8669 H 1983,
1.8 m (6 ft) SE of a witness post, and 0.15 m (0.5 ft) below ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8728669 PUBLICATION DATE: 10/30/2003
Name: SIKES CUT,ST.GEORGE ISLAND
FL
NOAA Chart: 11401 Latitude: 29° 36.8' N ( 29.61330)
USGS Quad: NEW INLET Longitude: 84° 57.5' W ( -84.95830)
T I D A L D A T U M S
Tidal datums at SIKES CUT,ST.GEORGE ISLAND based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: March 1984 - March 1984
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8728690 APALACHICOLA, APALACHICOLA RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.600
MEAN HIGH WATER MHW = 0.531
North American Vertical Datum NAVD88 = 0.410
MEAN TIDE LEVEL MTL = 0.345
MEAN SEA LEVEL MSL = 0.343
MEAN LOW WATER MLW = 0.159
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
8669 G 1983 4.764 4.233
290844 AA2 1975 1.780 1.249
8669 H 1983 4.660 4.129
4980 A17 4.637 4.106
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8728669 PUBLICATION DATE: 10/30/2003
Name: SIKES CUT,ST.GEORGE ISLAND
FL
NOAA Chart: 11401 Latitude: 29° 36.8' N ( 29.61330)
USGS Quad: NEW INLET Longitude: 84° 57.5' W ( -84.95830)
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.