U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 1 of 5
Station ID: 8674638 PUBLICATION DATE: 08/31/1984
Name: BELLVILLE POINT, SAPELO RIVER
GEORGIA
NOAA Chart: 11510 Latitude: 31ø 31.9' N
USGS Quad: SHELLMAN BLUFF Longitude: 81ø 21.6' W
To reach the tidal bench marks from U.S. Route 17 and State Route 99 in Eulonia,
travel 4 miles (6.4 km) SE on Route 99 to Crescent Georgia, turn north and
proceed 2 miles (3.2 km) to Bellville Point. The bench marks are located on
the property of Mr. Edeningfield, on the NE bank of the Sapelo River, 0.6 mile
(1.0 km) south of Savannah Cut and 0.7 mile (1.1 km) west of July Cut. The
tide gage and staff were located on the private dock at the Edeningfield
residence.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 4638 A 1977
MONUMENTATION: Survey Disk VM#: 4874
AGENCY: PID:
SETTING CLASSIFICATION: Unspecified Deep Rod
The bench mark is located at Bellville Point on the property of Mr.
Edeningfield, 123.1 feet (37.5 m) north of the north corner of the house, 121.4
feet (37.0 m) NE from Bench Mark 4638 B 1977, 94 feet (28.7 m) NW of the
centerline of the concrete walk, 7.0 feet (2.1 m) SSW of the bluff, 6.0 feet
(1.8 m) SE of the fenceline, and bears west of the dock. The bench mark is
crimped to the top of a rod driven 32.0 feet (9.8 m) to refusal, encased in a
PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 4638 B 1977
MONUMENTATION: Survey Disk VM#: 4875
AGENCY: PID:
SETTING CLASSIFICATION: Unspecified Deep Rod
The bench mark is located at Bellville Point on the property of Mr.
Edeningfield, 85.3 feet (26.0 m) NNE of Bench Mark 4638 C 1977, 75.3 feet (23.0
m) WNW of the north corner of the house, 42.7 feet (13.0 m) NW of the north
corner of the picnic area, and 5.9 feet (1.8 m) SE of the fenceline. The bench
mark is crimped to the top of a rod driven 24.0 feet (7.3 m) to refusal,
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: 8674638 PUBLICATION DATE: 08/31/1984
Name: BELLVILLE POINT, SAPELO RIVER
GEORGIA
NOAA Chart: 11510 Latitude: 31ø 31.9' N
USGS Quad: SHELLMAN BLUFF Longitude: 81ø 21.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4638 C 1977
MONUMENTATION: Survey Disk VM#: 4876
AGENCY: PID:
SETTING CLASSIFICATION: Unspecified Deep Rod
The bench mark is located at Bellville Point, on the property of Mr.
Edeningfield, 60.5 feet (18.4 m) NNE from Bench Mark 4638 D 1977, 37.3 feet
(11.4 m) west of the SE corner of the picnic patio, 22.5 feet (6.9 m) NE of the
fenceline near the gate, and bears west of the north corner of the house. The
bench mark is crimped to the top of a rod driven 24.0 feet (7.3 m) to refusal,
encased in a PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 4638 D 1977
MONUMENTATION: Survey Disk VM#: 4877
AGENCY: PID:
SETTING CLASSIFICATION: Unspecified Deep Rod
The bench mark is located at Bellville Point, on the property of Mr. Edingfield,
122.9 feet (37.5 m) NW of Bench Mark 4638 E 1977, 75.3 feet (23.0 m) SW of the
SE corner of the picnic patio, 22.1 feet (6.7 m) NE of the SW fenceline, and
4.3 feet (1.3 m) ESE of the NW fenceline. The bench mark is crimped to the top
of a rod driven 24 feet (7.3 m) to refusal, 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: 8674638 PUBLICATION DATE: 08/31/1984
Name: BELLVILLE POINT, SAPELO RIVER
GEORGIA
NOAA Chart: 11510 Latitude: 31ø 31.9' N
USGS Quad: SHELLMAN BLUFF Longitude: 81ø 21.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4638 E 1977
MONUMENTATION: Survey Disk VM#: 4878
AGENCY: PID:
SETTING CLASSIFICATION: Unspecified Deep Rod
The bench mark is located at Bellville point, on the property of Mr.
Edeningfield, 267 feet (81.3 m) SW of the shoreline, 27.3 feet (8.3 m) NNE of
the south corner of the property, 2 feet (0.6 m) NW of the SE fence line, and
bears SW of the east corner of the house. The bench mark is crimped to the top
of a rod driven 24.0 feet (7.3 m) to refusal, 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: 8674638 PUBLICATION DATE: 08/31/1984
Name: BELLVILLE POINT, SAPELO RIVER
GEORGIA
NOAA Chart: 11510 Latitude: 31ø 31.9' N
USGS Quad: SHELLMAN BLUFF Longitude: 81ø 21.6' W
T I D A L D A T U M S
Tidal datums at BELLVILLE POINT, SAPELO RIVER based on:
LENGTH OF SERIES: 89 HIGH WATER & 89 L
TIME PERIOD: MAY 6-JUNE 20, 1977
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8720030 FERNANDINA BEACH, FL
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (06/01/1977) = 10.07
MEAN HIGHER HIGH WATER (MHHW) = 8.06
MEAN HIGH WATER (MHW) = 7.69
MEAN TIDE LEVEL (MTL) = 3.94
MEAN LOW WATER (MLW) = 0.19
MEAN LOWER LOW WATER (MLLW) = 0.00
LOWEST OBSERVED WATER LEVEL (05/05/1977) = -1.22
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
4638 A 1977 13.01 5.32
4638 B 1977 17.37 9.68
4638 C 1977 19.63 11.94
4638 D 1977 21.92 14.23
4638 E 1977 19.35 11.66
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8674638 PUBLICATION DATE: 08/31/1984
Name: BELLVILLE POINT, SAPELO RIVER
GEORGIA
NOAA Chart: 11510 Latitude: 31ø 31.9' N
USGS Quad: SHELLMAN BLUFF Longitude: 81ø 21.6' 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 (NAVD 88).
NGVD 29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD 29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD 29 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 NGVD 29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD 88 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. NAVD 88 replaces NGVD 29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD 88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD 29 and NAVD 88 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 NAVD 88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD 88 elevations.
The NAVD 88 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, NAVD 88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD 88 elevations listed for
each bench mark in the NGS database.