U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8727395 PUBLICATION DATE: 04/01/2004
Name: PORT INGLIS, WITHLACOOCHEE R.
FL
NOAA Chart: 11408 Latitude: 29° 0.1' N ( 29.00170)
USGS Quad: WITHLACOOCHE BAY Longitude: 82° 45.5' W ( -82.75830)
To reach the tidal bench marks from the intersection of U.S. Highway 19-98 and
State Road C-40 in Inglis, proceed west on State Highway C-40 for 10.3 km (6.4
mi) to its end at a county park and boat ramp. The bench marks are located along
State Road C-40 and around the county park. The tide gage and staff were located
on the boat ramp at the end of State Road C-40.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7395 B 1978
DESIGNATION: 872 7395 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 8185
AGENCY: National Ocean Survey (NOS) IDB PID#: AR1661
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 29° 0.1' N ( 29.00170) LONGITUDE: 82° 45.6' W ( -82.76000)
The primary bench mark is a disk, 214 m (703 ft) east of the boat ramp, 24.08 m
(79.0 ft) SSW of a powerline pole on the north side of the road, 11.67 m (38.3
ft) south of the centerline of State Road C-40, and 0.40 m (1.3 ft) north of a
witness post. The bench mark is crimped to a galvanized steel rod driven 4.6 m
(15 ft) to refusal, and encased in a PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 7395 A 1978
DESIGNATION: 872 7395 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 8184
AGENCY: National Ocean Survey (NOS) IDB PID#: AR1662
SETTING CLASSIFICATION: Concrete pedestal OPUS PID#: AR1662
LATITUDE: 29° 0.1' N ( 29.00170) LONGITUDE: 82° 45.7' W ( -82.76170)
The bench mark is a disk set in the top of a concrete pedestal for the south
wall of the boat ramp, 6.31 m (20.7 ft) west of a palm tree and 2.96 m (9.7 ft)
south of the centerline of the boat ramp.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8727395 PUBLICATION DATE: 04/01/2004
Name: PORT INGLIS, WITHLACOOCHEE R.
FL
NOAA Chart: 11408 Latitude: 29° 0.1' N ( 29.00170)
USGS Quad: WITHLACOOCHE BAY Longitude: 82° 45.5' W ( -82.75830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7395 C 1978
DESIGNATION: 872 7395 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 8186
AGENCY: National Ocean Survey (NOS) IDB PID#: AR1660
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 29° 0.1' N ( 29.00170) LONGITUDE: 82° 45.5' W ( -82.75830)
The bench mark is a disk located 83 m (271 ft) NE of bench mark 7395 B 1978,
29.26 m (96.0 ft) NW of a radioactive warning siren pole, 26 m (86 ft) west of
the centerline of the gravel road leading to the park office and bath house, 8 m
(25 ft) south of the centerline of State Road C-40, 5.64 m (18.5 ft) south of a
power pole with a transformer, and 0.3 m (1 ft) north of a witness post. The
bench mark is crimped to the top of a galvanized steel rod driven 7.0 m (23 ft)
to refusal, and encased in a PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 7395 D 1978
DESIGNATION: 872 7395 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 8187
AGENCY: National Ocean Survey (NOS) IDB PID#: AR1664
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 29° 0.3' N ( 29.00500) LONGITUDE: 82° 45.5' W ( -82.75830)
The bench mark is a disk set in a concrete monument located near the picnic
area, 92 m (302 ft) north of bench mark 7395 E 1978, 21 m (69 ft) SE of the
shoreline, 14 m (47 ft) west of the NW corner of the park office trailer, 6.40 m
(21.0 ft) SW of the SW corner of a concrete picnic table, 2.13 m (7.0 ft) NW of
a 0.3 m (1 ft) diameter palm tree, and 0.3 m (1 ft) north of a witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8727395 PUBLICATION DATE: 04/01/2004
Name: PORT INGLIS, WITHLACOOCHEE R.
FL
NOAA Chart: 11408 Latitude: 29° 0.1' N ( 29.00170)
USGS Quad: WITHLACOOCHE BAY Longitude: 82° 45.5' W ( -82.75830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7395 E 1978
DESIGNATION: 872 7395 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 8188
AGENCY: National Ocean Survey (NOS) IDB PID#: AR1663
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 29° 0.2' N ( 29.00330) LONGITUDE: 82° 45.5' W ( -82.75830)
The bench mark is a disk set in a concrete monument, 97 m (317 ft) north of
bench mark 7395 C 1978, 13 m (42 ft) west of the centerline of the gravel road
leading to the park office and bath house, 8.81 m (28.9 ft) NE of the NE corner
of the bath house, 0.88 m (2.9 ft) north of a power pole, and 0.03 m (0.1 ft)
below the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8727395 PUBLICATION DATE: 04/01/2004
Name: PORT INGLIS, WITHLACOOCHEE R.
FL
NOAA Chart: 11408 Latitude: 29° 0.1' N ( 29.00170)
USGS Quad: WITHLACOOCHE BAY Longitude: 82° 45.5' W ( -82.75830)
T I D A L D A T U M S
Tidal datums at PORT INGLIS, WITHLACOOCHEE R. based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: September 1978 - October 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 = 1.234
MEAN HIGH WATER MHW = 1.122
North American Vertical Datum NAVD88 = 0.780
MEAN TIDE LEVEL MTL = 0.651
MEAN SEA LEVEL MSL = 0.648
MEAN LOW WATER MLW = 0.180
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
7395 B 1978 1.731 0.609
7395 A 1978 2.722 1.600
7395 C 1978 1.787 0.665
7395 D 1978 1.791 0.669
7395 E 1978 2.236 1.114
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8727395 PUBLICATION DATE: 04/01/2004
Name: PORT INGLIS, WITHLACOOCHEE R.
FL
NOAA Chart: 11408 Latitude: 29° 0.1' N ( 29.00170)
USGS Quad: WITHLACOOCHE BAY Longitude: 82° 45.5' W ( -82.75830)
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.