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National Ocean Service
Datums Page Page 1 of 7
Station ID: 8727577 PUBLICATION DATE: 02/05/2004
Name: SUWANNEE
FL
NOAA Chart: 11408 Latitude: 29° 19.7' N ( 29.32830)
USGS Quad: SUWANNEE Longitude: 83° 9.1' W ( -83.15170)
To reach the tidal bench marks from Suwannee, proceed SW along County Route 349
to the intersection with a road bridge just before the end of Route 349. The
bench marks are along the end of Route 349 and along the bridge. The tide gage
and staff were on the small pier behind a tackle shop across Highway 349 from
the north end of the bridge.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 1 1973
DESIGNATION: 872 7577 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 8211
AGENCY: National Ocean Survey (NOS) IDB PID#: AR1378
SETTING CLASSIFICATION: Bridge bulkhead OPUS PID:
LATITUDE: 29° 19.7' N ( 29.32830) LONGITUDE: 83° 9.0' W ( -83.15000)
The primary bench mark is a disk set flush in the top of the north end of the
east concrete retaining wall cap joining the bridge abutment, 15 m (50 ft) NE of
Bench Mark FLORIDA BM SRD, 15 m (48 ft) south of the centerline of State Highway
349, 9 m (28 ft) east of the centerline of the bridge, 8 m (27 ft) SW of power
pole #10, 5 m (18 ft) north of low end of east abutment, and 0.30 m (1.0 ft)
south of the north end of the retaining wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 8727577 PUBLICATION DATE: 02/05/2004
Name: SUWANNEE
FL
NOAA Chart: 11408 Latitude: 29° 19.7' N ( 29.32830)
USGS Quad: SUWANNEE Longitude: 83° 9.1' W ( -83.15170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: DUNNARY 1933
DESIGNATION: DUNNARY
MONUMENTATION: Triangulation Station disk VM#: 8208
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AR1381
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 29° 19.6' N ( 29.32670) LONGITUDE: 83° 9.1' W ( -83.15170)
The bench mark is a disk set flush in the top of a round concrete monument,
located in the small cottage and trailer development around a circular drive
with a park, south of the west end of State Highway 349, 9 m (28 ft) north of
the NE corner of the fourth cottage on the right, 8 m (27 ft) NW of the
centerline of the circular drive, 5 m (15 ft) SE of the third cottage on the
right, and 0.24 m (0.8 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 8727577 PUBLICATION DATE: 02/05/2004
Name: SUWANNEE
FL
NOAA Chart: 11408 Latitude: 29° 19.7' N ( 29.32830)
USGS Quad: SUWANNEE Longitude: 83° 9.1' W ( -83.15170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: DUNNARY NO 2 1933
DESIGNATION: DUNNARY RM 2
MONUMENTATION: Reference Mark disk VM#: 8209
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AR1380
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 29° 19.6' N ( 29.32670) LONGITUDE: 83° 9.1' W ( -83.15170)
The bench mark is a disk set flush in the top of a concrete monument, 12 m (40
ft) south of the centerline of the south end of the circular drive, 6 m (19 ft)
east of a 1 m (3 ft) diameter leaning oak tree, 5 m (15 ft) north of NE corner
of small cottage, 2 m (7 ft) NW of a 0.76 m (2.5 ft) diameter oak tree, and 0.30
m (1.0 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 8727577 PUBLICATION DATE: 02/05/2004
Name: SUWANNEE
FL
NOAA Chart: 11408 Latitude: 29° 19.7' N ( 29.32830)
USGS Quad: SUWANNEE Longitude: 83° 9.1' W ( -83.15170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: DUNNARY NO 3 1933
DESIGNATION: DUNNARY RM 3
MONUMENTATION: Reference Mark disk VM#: 8210
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AR1597
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 29° 19.6' N ( 29.32670) LONGITUDE: 83° 9.1' W ( -83.15170)
The bench mark is a disk set in the top of a concrete monument, 19.81 m (65.0
ft) south of the front door of the first house on the right, 14.63 m (48.0 ft)
east of the NE corner of the second house on the right along the circular drive,
5.18 m (17.0 ft) east of the centerline of the circular drive, 0.91 m (3.0 ft)
NE of a power pole, and 0.09 m (0.3 ft) below ground level.
BENCH MARK STAMPING: 7577 A 1976
DESIGNATION: 872 7577 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 8212
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified deep rod OPUS PID:
LATITUDE: 29° 19.7' N ( 29.32830) LONGITUDE: 83° 9.1' W ( -83.15170)
The bench mark is a disk located 0.3 km (0.2 mi) east of the west end of State
Highway 349, 41 m (135 ft) NNW of Bench Mark FLORIDA BM SRD located at the NW
corner of the bridge, 24 m (78 ft) east of the SE corner of the tackle shop, and
16.92 m (55.5 ft) north of the centerline of State Highway 349. The bench mark
is crimped to the top of a steel rod driven an unspecified depth to refusal, and
encased in PVC pipe and a concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 8727577 PUBLICATION DATE: 02/05/2004
Name: SUWANNEE
FL
NOAA Chart: 11408 Latitude: 29° 19.7' N ( 29.32830)
USGS Quad: SUWANNEE Longitude: 83° 9.1' W ( -83.15170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: FLORIDA BM SRD
DESIGNATION: 872 7577 FLORIDA BM SRD
MONUMENTATION: Tidal Station disk VM#: 8213
AGENCY: Florida State Road Department (FLSRD) IDB PID#:
SETTING CLASSIFICATION: Concrete abutment OPUS PID:
LATITUDE: 29° 19.7' N ( 29.32830) LONGITUDE: 83° 9.1' W ( -83.15170)
The bench mark is a disk set flush in the top of the NW abutment of the concrete
road bridge over the bayou parallel to Highway 349, 24 m (80 ft) south of the
centerline of State Highway 349, 15 m (50 ft) SW of Bench Mark 1 1973, and 1 m
(3 ft) west of the west edge of the road over the bridge.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 8727577 PUBLICATION DATE: 02/05/2004
Name: SUWANNEE
FL
NOAA Chart: 11408 Latitude: 29° 19.7' N ( 29.32830)
USGS Quad: SUWANNEE Longitude: 83° 9.1' W ( -83.15170)
T I D A L D A T U M S
Tidal datums at SUWANNEE based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: March 1975 - February 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) = 1.945
MEAN HIGHER HIGH WATER MHHW = 1.057
MEAN HIGH WATER MHW = 0.963
North American Vertical Datum NAVD88 = 0.569
MEAN TIDE LEVEL MTL = 0.560
MEAN SEA LEVEL MSL = 0.548
MEAN LOW WATER MLW = 0.157
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (08/05/1975) = -0.439
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
1 1973 1.619 0.656
DUNNARY 1933 2.344 1.381
DUNNARY NO 2 1933 2.788 1.825
DUNNARY NO 3 1933 1.875 0.912
7577 A 1976 1.662 0.699
FLORIDA BM SRD 3.612 2.649
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 8727577 PUBLICATION DATE: 02/05/2004
Name: SUWANNEE
FL
NOAA Chart: 11408 Latitude: 29° 19.7' N ( 29.32830)
USGS Quad: SUWANNEE Longitude: 83° 9.1' W ( -83.15170)
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.