U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8724962 PUBLICATION DATE: 02/05/2004
Name: FAKAHATCHEE RIVER ENTRANCE
FL
NOAA Chart: 11429 Latitude: 25° 53.4' N ( 25.89000)
USGS Quad: WEAVERS STATION Longitude: 81° 28.6' W ( -81.47670)
To reach the tidal bench marks from Naples, proceed SE on U.S. 41 to the Remuda
Ranch, then proceed by boat south down the Faka Union River to the vicinity of
marker 46 in Faka Union Bay, then proceed east to Fakahatchee Bay, then continue
east in Fakahatchee Bay to a sand beach on the point of land separating the
Fakahatchee River from the East River. The bench marks are north of the sand
beach in the vicinity of concrete cisterns. The tide gage and staff were
located on a platform 46 m (150 ft) south of the sand beach.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 4962 B 1978
DESIGNATION: 872 4962 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 9721
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified deep rod OPUS PID:
LATITUDE: 25° 53.4' N ( 25.89000) LONGITUDE: 81° 28.6' W ( -81.47670)
The bench mark is a disk located 23.01 m (75.5 ft) SSE of bench mark 4962 A
1978, 10.70 m (35.1 ft) SSE of east corner of the smaller of a pair of broken
cisterns, 8.81 m (28.9 ft) NW of the north corner of the southernmost cistern,
5.76 m (18.9 ft) south of the root mass of an overturned tree, and 0.46 m (1.5
ft) south of an old witness post. The bench mark is 18 cm (0.6 ft) above ground
level, crimped to the top of an unspecified steel rod driven 10.7 m (35 ft) to
refusal, and encased in a PVC pipe.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8724962 PUBLICATION DATE: 02/05/2004
Name: FAKAHATCHEE RIVER ENTRANCE
FL
NOAA Chart: 11429 Latitude: 25° 53.4' N ( 25.89000)
USGS Quad: WEAVERS STATION Longitude: 81° 28.6' W ( -81.47670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4962 A 1978
DESIGNATION: 872 4962 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 9720
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 25° 53.4' N ( 25.89000) LONGITUDE: 81° 28.6' W ( -81.47670)
The bench mark is a disk set in a concrete monument located 12.80 m (42.0 ft)
south of the center of a camp area, 9.11 m (29.9 ft) WNW of the west corner of a
large intact cistern dated 1909, 5.76 m (18.9 ft) north of the northernmost
corner of a large pair of broken cisterns, 2.41 m (7.9 ft) south of the concrete
rubble from a 1 x 2 m (3 x 8 ft) trough, 0.52 m (1.7 ft) SW of a witness post,
and 0.12 m (0.4 ft) below ground level.
BENCH MARK STAMPING: 4962 C 1978
DESIGNATION: 872 4962 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 9722
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 25° 53.4' N ( 25.89000) LONGITUDE: 81° 28.6' W ( -81.47670)
The bench mark is a disk set in a concrete monument located 35.60 m (116.8 ft)
SE of bench mark 4962 B 1978, 4.82 m (15.8 ft) north of a large patch of cactus,
2.32 m (7.6 ft) NE of a large bramble bush, 2.13 m (7.0 ft) SW of a clump of
trees, 0.49 m (0.6 ft) SW of a new witness post, and 0.40 m (1.3 ft) west of an
old witness post, 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 5
Station ID: 8724962 PUBLICATION DATE: 02/05/2004
Name: FAKAHATCHEE RIVER ENTRANCE
FL
NOAA Chart: 11429 Latitude: 25° 53.4' N ( 25.89000)
USGS Quad: WEAVERS STATION Longitude: 81° 28.6' W ( -81.47670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4962 D 1978
DESIGNATION: 872 4962 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 9723
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 25° 53.4' N ( 25.89000) LONGITUDE: 81° 28.6' W ( -81.47670)
The bench mark is a disk set in a concrete monument located 30.39 m (99.7 ft)
ESE of bench mark 4962 C 1978, 7.92 m (26.0 ft) WNW of a large root clump of an
overturned tree, 3.44 m (11.3 ft) SE of the largest of two pine trees, 2 m (8
ft) north of the approximate shoreline, 0.37 m (1.2 ft) SSW of an old witness
post, 0.37 m (1.2 ft) NNE of a new witness post, and 0.06 m (0.2 ft) below
ground level.
BENCH MARK STAMPING: 4962 E 1978
DESIGNATION: 872 4962 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 9724
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 25° 53.4' N ( 25.89000) LONGITUDE: 81° 28.6' W ( -81.47670)
The bench mark is a disk set in a concrete monument located in the center of a 6
m (20 ft) wide shell ridge, 44 m (145 ft) ESE of bench mark 4962 D 1978, 5.15 m
(16.9 ft) NE of the north corner of a concrete water trough, 4.21 m (13.8 ft) SW
of a large tree, 0.43 m (1.4 ft) west of an old witness post, 0.43 m (1.4 ft)
east of a new witness post, and 0.03 m (0.1 ft) below ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8724962 PUBLICATION DATE: 02/05/2004
Name: FAKAHATCHEE RIVER ENTRANCE
FL
NOAA Chart: 11429 Latitude: 25° 53.4' N ( 25.89000)
USGS Quad: WEAVERS STATION Longitude: 81° 28.6' W ( -81.47670)
T I D A L D A T U M S
Tidal datums at FAKAHATCHEE RIVER ENTRANCE based on:
LENGTH OF SERIES: 5 MONTHS
TIME PERIOD: January 1978 - May 1978
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8724967 MARCO ISLAND, CAXAMBAS PASS
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.944
MEAN HIGH WATER MHW = 0.855
MEAN TIDE LEVEL MTL = 0.488
MEAN SEA LEVEL MSL = 0.460
MEAN LOW WATER MLW = 0.120
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
4962 B 1978 1.821 0.966
4962 A 1978 1.700 0.845
4962 C 1978 1.356 0.501
4962 D 1978 1.246 0.391
4962 E 1978 1.630 0.775
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8724962 PUBLICATION DATE: 02/05/2004
Name: FAKAHATCHEE RIVER ENTRANCE
FL
NOAA Chart: 11429 Latitude: 25° 53.4' N ( 25.89000)
USGS Quad: WEAVERS STATION Longitude: 81° 28.6' W ( -81.47670)
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.