U.S. DEPARTMENT OF COMMERCE
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National Ocean Service
Datums Page Page 1 of 5
Station ID: 8728958 PUBLICATION DATE: 11/13/2003
Name: ST. JOSEPH POINT, ST. JOSEPH BAY
FL
NOAA Chart: 11389 Latitude: 29° 52.4' N ( 29.87330)
USGS Quad: ST. JOSEPH POINT Longitude: 85° 23.4' W ( -85.39000)
To reach the tidal bench marks from the Port St. Joe Post Office, proceed SE on
U.S. Highway 98 for 3.9 km (2.4 mi) to the junction with County Road C-30, then
turn right and proceed south on County Road C-30 for 11.1 km (6.9 mi) to the
junction of County Road C-30E, then turn right and proceed west and north on
County Road C-30E for 8.7 km (5.4 mi) to the boat launch at Eagle Harbor at St.
Joseph State Park, then continue north by boat for 8.4 km (6 nm) to St. Joseph
Point. The bench marks are 1.0 km (0.6 mi) SW of St. Joseph Point. The tide
gage and staff were located on a free standing structure 381 m (1250 ft) SW of
St. Joseph Point, near a dredge pipe.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8958 A 1976
DESIGNATION: 872 8958 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 9925
AGENCY: National Ocean Survey (NOS) IDB PID#: AS0953
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 29° 52.5' N ( 29.87500) LONGITUDE: 85° 23.4' W ( -85.39000)
The primary bench mark is a disk located 1.0 km (0.6 mi) SW of St. Joseph Point,
122 m (400 ft) SW of an abandoned dredge pipe, 90 m (296 ft) ENE of bench mark
8958 B 1976, 60 m (196 ft) NNW of the shoreline, 4 m (14 ft) west of the lone
palm tree nearest to the shore, and 0.3 m (1 ft) east of a witness post. The
bench mark is set 0.18 m (0.6 ft) below ground level, crimped to the top of a
copper-clad steel rod driven 12.2 m (40 ft) to refusal, and encased in a PVC
pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8728958 PUBLICATION DATE: 11/13/2003
Name: ST. JOSEPH POINT, ST. JOSEPH BAY
FL
NOAA Chart: 11389 Latitude: 29° 52.4' N ( 29.87330)
USGS Quad: ST. JOSEPH POINT Longitude: 85° 23.4' W ( -85.39000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8958 B 1976
DESIGNATION: 872 8958 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 9926
AGENCY: National Ocean Survey (NOS) IDB PID#: AS0954
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 29° 52.5' N ( 29.87500) LONGITUDE: 85° 23.5' W ( -85.39170)
The bench mark is a disk located west of a grassy ridge of sand dumes, 198 m
(650 ft) NW of bench mark 8958 C 1976, 128 m (420 ft) NW of the shoreline, 90 m
(296 ft) WSW of bench mark 8958 A 1976, and 0.49 m (1.6 ft) east of a witness
post. The bench mark is set 0.12 m (0.4 ft) below ground level, crimped to the
top of a copper-clad steel rod driven 10.4 m (34 ft) to refusal and encased in a
PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 8958 C 1976
DESIGNATION: 872 8958 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 9927
AGENCY: National Ocean Survey (NOS) IDB PID#: AS0955
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 29° 52.4' N ( 29.87330) LONGITUDE: 85° 23.5' W ( -85.39170)
The bench mark is a disk, located 198 m (650 ft) SSE of bench mark 8958 B 1976,
106 m (349 ft) ENE of bench mark 8958 D 1976, 23 m (75 ft) WNW of the shoreline,
11 m (37 ft) west of a lone palm tree close to shore, and 0.46 m (1.5 ft) east
of a witness post. The bench mark is set 0.15 m (0.5 ft) below ground level,
crimped to the top of a copper-clad steel rod driven 9.8 m (32 ft) to refusal,
and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8728958 PUBLICATION DATE: 11/13/2003
Name: ST. JOSEPH POINT, ST. JOSEPH BAY
FL
NOAA Chart: 11389 Latitude: 29° 52.4' N ( 29.87330)
USGS Quad: ST. JOSEPH POINT Longitude: 85° 23.4' W ( -85.39000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8958 D 1976
DESIGNATION: 872 8958 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 9928
AGENCY: National Ocean Survey (NOS) IDB PID#: AS0956
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 29° 52.4' N ( 29.87330) LONGITUDE: 85° 23.5' W ( -85.39170)
The bench mark is a disk located 106 m (349 ft) WSW of bench mark 8958 C 1976,
78 m (255 ft) west of the shoreline, and 0.46 m (1.5 ft) east of a witness post.
The bench mark is set 0.12 m (0.4 ft) below ground level, crimped to the top of
a copper-clad steel rod driven 12.2 m (40 ft) to refusal and encased in a PVC
pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8728958 PUBLICATION DATE: 11/13/2003
Name: ST. JOSEPH POINT, ST. JOSEPH BAY
FL
NOAA Chart: 11389 Latitude: 29° 52.4' N ( 29.87330)
USGS Quad: ST. JOSEPH POINT Longitude: 85° 23.4' W ( -85.39000)
T I D A L D A T U M S
Tidal datums at ST. JOSEPH POINT, ST. JOSEPH BAY based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: July 1976 - July 1976
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8728912 PORT ST. JOE
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.474
MEAN HIGH WATER MHW = 0.381
North American Vertical Datum NAVD88 = 0.239
MEAN SEA LEVEL MSL = 0.232
MEAN TIDE LEVEL MTL = 0.204
MEAN LOW WATER MLW = 0.027
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
8958 A 1976 2.040 1.659
8958 B 1976 1.808 1.427
8958 C 1976 1.003 0.622
8958 D 1976 1.756 1.375
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8728958 PUBLICATION DATE: 11/13/2003
Name: ST. JOSEPH POINT, ST. JOSEPH BAY
FL
NOAA Chart: 11389 Latitude: 29° 52.4' N ( 29.87330)
USGS Quad: ST. JOSEPH POINT Longitude: 85° 23.4' W ( -85.39000)
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.