U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 02/14/1989
Station ID: 8679964 SUPERCEDED DATE: 04/21/2003
Name: ST. MARYS, ST. MARYS RIVER
GEORGIA
NOAA Chart: 11503 Latitude: 30° 43.2' N
USGS Quad: ST. MARYS Longitude: 81° 32.9' W
To reach the tidal bench marks from the intersection of I-95 and State Highway
40 in Kingsland, proceed SE on State Highway 40 for 9 miles (14 km) to the
village of St. Marys. The bench marks are along Osborne Street and along the
waterfront in the vicinity of the municipal dock. The tide gage and staff were
on the dock behind the Langs Seafood building at the foot of Osborne Street.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: ST MARYS NO 1 1934
MONUMENTATION: Survey Disk VM#: 7070
AGENCY: PID#: BC0049
SETTING CLASSIFICATION: Building Wall
The bench mark is set vertically in the east wall of the Riverview Hotel at the
NW corner of the intersection of Osborne and St. Marys Streets, 15 feet (5 m)
north of the north curb of St. Marys Street, 9.6 feet (2.9 m) west of the west
curb of Osborne Street, 9.5 feet (2.9 m) north of the SE corner of the building,
and 4 feet (1 m) above sidewalk level.
BENCH MARK STAMPING: ST MARYS NO 2 1934
MONUMENTATION: Survey Disk VM#: 7071
AGENCY: PID#: BC0048
SETTING CLASSIFICATION: Building Wall
The bench mark is set vertically in the south wall of the First South Bank of
Camden County, 16.5 feet (5.0 m) north of the centerline of a stable alley
street, 10 feet (3 m) west of the west curb of Osborne Street, 1.5 feet (0.5 m)
west of the SE corner of the building, and 3.3 feet (1.0 m) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 02/14/1989
Station ID: 8679964 SUPERCEDED DATE: 04/21/2003
Name: ST. MARYS, ST. MARYS RIVER
GEORGIA
NOAA Chart: 11503 Latitude: 30° 43.2' N
USGS Quad: ST. MARYS Longitude: 81° 32.9' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: ST MARYS GA SURVEY MAY 1946 SE
CORNER
MONUMENTATION: Survey Disk VM#: 7072
AGENCY: PID#: BC2418
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in a 0.3-foot (0.1 m) square concrete monument at the NW
corner of the intersection of Osborne and Bryant Streets, 8.5 feet (2.6 m) west
of the west curb of Osborne Street, 6.7 feet (2.0 m) east of the SE corner of an
abandoned church, and 0.2 foot (0.1 m) above the concrete porch of the church.
BENCH MARK STAMPING: B 199 1961
MONUMENTATION: Survey Disk VM#: 7073
AGENCY: PID#: BC0044
SETTING CLASSIFICATION: Building Wall
The bench mark is set vertically in the west face of the auditorium of St. Marys
Elementary School, about 0.55 mile (0.89 km) south along Osborne Street from St.
Marys Railroad Crossing, 145 feet (44 m) east of the center of the T junction of
Osborne and Alexander Streets, 1.9 feet (0.6 m) south of the NW corner of the
school, and 2.1 feet (0.6 m) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 02/14/1989
Station ID: 8679964 SUPERCEDED DATE: 04/21/2003
Name: ST. MARYS, ST. MARYS RIVER
GEORGIA
NOAA Chart: 11503 Latitude: 30° 43.2' N
USGS Quad: ST. MARYS Longitude: 81° 32.9' W
T I D A L D A T U M S
Tidal datums at ST. MARYS, ST. MARYS RIVER based on:
LENGTH OF SERIES: 25 MONTHS
TIME PERIOD: MARCH 1976-JUNE 1978
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8720030 FERNANDINA, FL
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (02/09/1978) = 8.12
MEAN HIGHER HIGH WATER MHHW = 6.43
MEAN HIGH WATER MHW = 6.11
MEAN TIDE LEVEL MTL = 3.16
* NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 2.75
MEAN LOW WATER MLW = 0.21
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (04/05/1977) = -2.46
* NGVD reference based on elevations published in Quad 300814, 1973, and NOS
leveling of 1985.
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
ST MARYS NO 1 1934 13.38 7.27
ST MARYS NO 2 1934 12.87 6.76
ST MARYS GA SURVEY MAY 1946 SE
CORNER 11.63 5.52
B 199 1961 16.34 10.23
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 02/14/1989
Station ID: 8679964 SUPERCEDED DATE: 04/21/2003
Name: ST. MARYS, ST. MARYS RIVER
GEORGIA
NOAA Chart: 11503 Latitude: 30° 43.2' N
USGS Quad: ST. MARYS Longitude: 81° 32.9' W
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 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.