U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8727411 PUBLICATION DATE: 04/29/2004
Name: YANKEETOWN, WITHLACOOCHEE RIVER
FL
NOAA Chart: 11408 Latitude: 29° 1.8' N ( 29.03000)
USGS Quad: YANKEETOWN Longitude: 82° 42.8' W ( -82.71330)
To reach the tidal bench marks from the intersection of U.S. Highway 19-98 and
County Road C-40 in Inglis, proceed west on County Road C-40 for 4.2 km (2.6 mi)
to 56th Street, proceed south on 56th Street for 0.3 km (0.2 mi) to Riverside
Drive, then west on Riverside Drive for 0.3 km (0.2 mi) to the U.S. Coast Guard
base. The bench marks are located near the Coast Guard station and along
Riverside Drive. The tide gage and staff were located on the Coast Guard
Station pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7411 D 1978
DESIGNATION: 872 7411 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 8191
AGENCY: National Ocean Survey (NOS) IDB PID#: AR1654
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 29° 1.8' N ( 29.03000) LONGITUDE: 82° 42.8' W ( -82.71330)
The primary bench mark is a disk located near the intersection of 61st Street
and Riverside Drive in the median of Riverside Drive, 51 m (168 ft) NE of the
centerline of 61st Street, 10 m (32 ft) NW of the centerline of eastbound
Riverside Drive, 8 m (26 ft) SE of the centerline of westbound Riverside Drive,
and 0.58 m (1.9 ft) SW of a power pole with witness sign. The bench mark is
crimped to the top of a 5/8" galvanized steel rod driven 2.1 m (7 ft) to
refusal, and encased in a PVC pipe and a concrete kickblock.
BENCH MARK STAMPING: 7411 B 1978
DESIGNATION: 872 7411 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 8189
AGENCY: National Ocean Survey (NOS) IDB PID#: AR1656
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 29° 1.8' N ( 29.03000) LONGITUDE: 82° 43.0' W ( -82.71670)
The bench mark is a disk set in a concrete base supporting a flag pole located
at the old post office building on Harmony Lane (between 62nd and 63rd Streets),
ENE of the town hall, 130 m (428 ft) north of bench mark L 21 1933 7.526, 15 m
(50 ft) NW of the centerline of Harmony Lane, 0.76 m (2.5 ft) east of the SE
corner of the post office, and 0.43 m (1.4 ft) south of the flag pole.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8727411 PUBLICATION DATE: 04/29/2004
Name: YANKEETOWN, WITHLACOOCHEE RIVER
FL
NOAA Chart: 11408 Latitude: 29° 1.8' N ( 29.03000)
USGS Quad: YANKEETOWN Longitude: 82° 42.8' W ( -82.71330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7411 C 1978
DESIGNATION: 872 7411 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 8190
AGENCY: National Ocean Survey (NOS) IDB PID#: AR1655
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 29° 1.8' N ( 29.03000) LONGITUDE: 82° 42.9' W ( -82.71500)
The bench mark is a disk set in the top of a concrete monument on the south side
of Riverside Drive at the intersection of 62nd Street, 189 m (621 ft) WSW of
bench mark 7411 D 1978, 17 m (56 ft) SW of the centerline of a sand driveway, 6
m (19 ft) SSE of the centerline of eastbound Riverside Drive, and 0.88 m (2.9
ft) NW of a power pole with a witness sign attached, and 0.03 m (0.1 ft) below
the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8727411 PUBLICATION DATE: 04/29/2004
Name: YANKEETOWN, WITHLACOOCHEE RIVER
FL
NOAA Chart: 11408 Latitude: 29° 1.8' N ( 29.03000)
USGS Quad: YANKEETOWN Longitude: 82° 42.8' W ( -82.71330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: L 21 1933 7.526
DESIGNATION: L 21
MONUMENTATION: Bench Mark disk VM#: 8192
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AR0721
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 29° 1.8' N ( 29.03000) LONGITUDE: 82° 43.0' W ( -82.71670)
The bench mark is a disk set in the top of a concrete monument at the
intersection of Riverside Drive and 63rd Street, 15.36 m (50.5 ft) SE of the
centerline of Riverside Drive, 8.29 m (27.2 ft) SW of the centerline of the
entrance driveway to Izzak Walton Lodge, and 5.30 m (17.4 ft) NE of the north
corner of teh lodge.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8727411 PUBLICATION DATE: 04/29/2004
Name: YANKEETOWN, WITHLACOOCHEE RIVER
FL
NOAA Chart: 11408 Latitude: 29° 1.8' N ( 29.03000)
USGS Quad: YANKEETOWN Longitude: 82° 42.8' W ( -82.71330)
T I D A L D A T U M S
Tidal datums at YANKEETOWN, WITHLACOOCHEE RIVER based on:
LENGTH OF SERIES: 6 MONTHS
TIME PERIOD: July 1978 - December 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 = 1.195
MEAN HIGH WATER MHW = 1.092
North American Vertical Datum NAVD88 = 0.677
MEAN SEA LEVEL MSL = 0.633
MEAN TIDE LEVEL MTL = 0.628
MEAN LOW WATER MLW = 0.165
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
7411 D 1978 3.854 2.762
7411 B 1978 3.927 2.835
7411 C 1978 2.710 1.618
L 21 1933 7.526 2.669 1.577
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8727411 PUBLICATION DATE: 04/29/2004
Name: YANKEETOWN, WITHLACOOCHEE RIVER
FL
NOAA Chart: 11408 Latitude: 29° 1.8' N ( 29.03000)
USGS Quad: YANKEETOWN Longitude: 82° 42.8' W ( -82.71330)
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.