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Datums Page Page 1 of 5
Station ID: 8727695 PUBLICATION DATE: 06/02/2003
Name: STEINHATCHEE
FL
NOAA Chart: 11407 Latitude: 29° 40.3' N ( 29.67170)
USGS Quad: STEINHATCHEE Longitude: 83° 23.4' W ( -83.39000)
To reach the tidal bench marks from the Post Office at Steinhatchee, proceed 0.3
km (0.2 mi) west along State Highway 51 to Pace's grocery store. The bench
marks are located along State Highway 51 and 2nd Avenue. The tide gage and
staff were located on a concrete pier behind the grocery store.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: TIDAL 1 1973
DESIGNATION: 872 7695 TIDAL 1 FLDT
MONUMENTATION: Tidal Station disk VM#: 8224
AGENCY: Florida Department of Transportation
(FLDT) IDB PID#: AR1382
SETTING CLASSIFICATION: Concrete monument OPUS PID#: AR1382
LATITUDE: 29° 40.2' N ( 29.67000) LONGITUDE: 83° 23.0' W ( -83.38330)
The primary bench mark is a disk set in the top of a concrete monument at the SW
corner of the intersection of 2nd Avenue and 7th Street, near the NE property
corner of the Steinhatchee Baptist Church, 23 m (75 ft) SW of the centerline of
the intersection of Seventh Streed and Second Avenue, 18 m (58 ft) west of the
centerline of Seventh Street, 14 m (46 ft) south of the centerline of Second
Avenue, and 0.67 m (2.2 ft) NNE of a utility pole with a witness sign attached.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8727695 PUBLICATION DATE: 06/02/2003
Name: STEINHATCHEE
FL
NOAA Chart: 11407 Latitude: 29° 40.3' N ( 29.67170)
USGS Quad: STEINHATCHEE Longitude: 83° 23.4' W ( -83.39000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TIDAL 2 1973
DESIGNATION: 872 7695 TIDAL 2 FLDT
MONUMENTATION: Tidal Station disk VM#: 8225
AGENCY: Florida Department of Transportation
(FLDT) IDB PID#: AR1383
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 29° 40.2' N ( 29.67000) LONGITUDE: 83° 23.2' W ( -83.38670)
The bench mark is a disk set in the top of a concrete monument at the SE corner
of a 90-degree turn at the west end of 2nd Avenue, 30 m (97 ft) east of the NE
corner of a red house, 19 m (62 ft) SE of the centerline at the intersection of
the street at the curve, 4 m (13 ft) NW of a fence corner, and 1 m (2 ft) NW of
a witness post.
BENCH MARK STAMPING: TIDAL NO 3 1973
DESIGNATION: 872 7695 TIDAL 3 FLDT
MONUMENTATION: Tidal Station disk VM#: 8226
AGENCY: Florida Department of Transportation
(FLDT) IDB PID#: AR1384
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 29° 40.3' N ( 29.67170) LONGITUDE: 83° 23.4' W ( -83.39000)
The bench mark is a disk set in the concrete seawall behind Pace's grocery
store, 37 m (122 ft) SW of the centerline of State Highway 51, 7 m (24 ft) SW of
the SW corner of the grocery store, 4 m (13 ft) south of the SE corner of the
ice house, and 0.3 m (1 ft) SW of an iron pole with a "Phillips 66" sign.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8727695 PUBLICATION DATE: 06/02/2003
Name: STEINHATCHEE
FL
NOAA Chart: 11407 Latitude: 29° 40.3' N ( 29.67170)
USGS Quad: STEINHATCHEE Longitude: 83° 23.4' W ( -83.39000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TIDAL NO 4 1973
DESIGNATION: 872 7695 TIDAL 4 FLDT
MONUMENTATION: Tidal Station disk VM#: 8227
AGENCY: Florida Department of Transportation
(FLDT) IDB PID#: AR1385
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 29° 40.4' N ( 29.67330) LONGITUDE: 83° 23.4' W ( -83.39000)
The bench mark is a disk set in the top of a concrete monument located on the
south side of State Highway 51 at the curve in the NE corner of a fence for a
one-story white frame house, 0.2 km (0.1 mi) west of bench mark Tidal NO 3 1973,
30 m (97 ft) south of the SW corner of a hardware store, 24 m (80 ft) SE of a
powerline pole, 18.14 m (59.5 ft) NW of a fire hydrant, 15.54 m (51.0 ft) south
of the centerline of State Highway 51, 3.05 m (10.0 ft) WNW of a fence corner,
and 0.40 m (1.3 ft) west of a witness post.
BENCH MARK STAMPING: TIDAL NO 5 1973
DESIGNATION: 872 7695 TIDAL 5 FLDT
MONUMENTATION: Tidal Station disk VM#: 8228
AGENCY: Florida Department of Transportation
(FLDT) IDB PID#: AR1386
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 29° 40.4' N ( 29.67330) LONGITUDE: 83° 23.5' W ( -83.39170)
The bench mark is a disk set in the top of a concrete monument located on the
south side of State Highway 51 at the NE fence corner for an off white frame
house, 0.5 km (0.3 mi) west of bench mark TIDAL NO 3 1973, 15 m (48 ft) south of
the centerline of State Highway 51, 13 m (43 ft) SE of a powerline pole with a
transformer, 12 m (39 ft) NE of the NE corner of an off white frame house, 0.49
m (1.6 ft) north of the NE fence corner.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8727695 PUBLICATION DATE: 06/02/2003
Name: STEINHATCHEE
FL
NOAA Chart: 11407 Latitude: 29° 40.3' N ( 29.67170)
USGS Quad: STEINHATCHEE Longitude: 83° 23.4' W ( -83.39000)
T I D A L D A T U M S
Tidal datums at STEINHATCHEE based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: July 1975 - June 1976
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:
HIGHEST OBSERVED WATER LEVEL (10/17/1975) = 2.084
MEAN HIGHER HIGH WATER MHHW = 1.166
MEAN HIGH WATER MHW = 1.082
North American Vertical Datum NAVD88 = 0.664
MEAN TIDE LEVEL MTL = 0.645
MEAN SEA LEVEL MSL = 0.640
MEAN LOW WATER MLW = 0.208
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/11/1973) = -0.614
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
TIDAL 1 1973 4.702 3.620
TIDAL 2 1973 5.640 4.558
TIDAL NO 3 1973 2.170 1.088
TIDAL NO 4 1973 4.947 3.865
TIDAL NO 5 1973 2.016 0.934
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8727695 PUBLICATION DATE: 06/02/2003
Name: STEINHATCHEE
FL
NOAA Chart: 11407 Latitude: 29° 40.3' N ( 29.67170)
USGS Quad: STEINHATCHEE Longitude: 83° 23.4' W ( -83.39000)
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.
Station Location
Published bench mark
Unpublished bench mark
