U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
PUBLICATION DATE: 05/16/1984
Station ID: 8670870 SUPERCEDED DATE: 04/21/2003
Name: FORT PULASKI NATIONAL MONUMENT, SAVANNAH RIVER
GEORGIA
NOAA Chart: 11513 Latitude: 32° 2.0' N
USGS Quad: FORT PULASKI Longitude: 80° 54.1' W
To reach the tidal bench marks from the south end of Highway 17A bridge over the
Savannah River in downtown Savannah, turn left and proceed 0.4 miles (0.6 km) up
the hill to the intersection of West Broad Street, turn left onto West Broad
Street and proceed 0.2 miles (0.3 km) to East Bay Street, turn right on East Bay
Street for 1.0 mile (1.6 km) until East Bay Street becomes General McIntosh
Drive, then 0.2 miles (0.3 km) to East President Drive, turn left onto East
President Drive, proceed 5.1 miles (8.2 km) to the junction of Rt. 80, turn left
onto Rt. 80 East and proceed 7.1 miles (11.4 km) to the entrance of Fort Pulaski
National Monument, turn left and continuing 0.8 mile (1.3 km) to the junction in
the road to the fort, then 0.4 mile (0.6 km) to the Pilots Dock. The bench
marks are located along the entrance road and in the vicinity of the Savannah
Bar Pilots Residence. The gage is located in a NOS tide house on the Pilots
Dock located behind the Savannah Pilots Residence.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5
MONUMENTATION: Survey Disk VM#: 625
AGENCY: PID#: CK0697
SETTING CLASSIFICATION: Concrete Post
The bench mark is south of the concrete parking lot for the Savannah Bar Pilots
Residence 86.6 feet (26.4 m) SE of the southern corner of Savannah Bar Pilot
Residence, 81.7 feet (24.9 m) west of a unnumbered power pole, 18.8 feet (5.7 m)
SSW of the centerline of paved road, and 5.9 feet (1.8 m) ENE of witness post
with sign. The bench mark is at ground level, and set flush in a concrete post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
PUBLICATION DATE: 05/16/1984
Station ID: 8670870 SUPERCEDED DATE: 04/21/2003
Name: FORT PULASKI NATIONAL MONUMENT, SAVANNAH RIVER
GEORGIA
NOAA Chart: 11513 Latitude: 32° 2.0' N
USGS Quad: FORT PULASKI Longitude: 80° 54.1' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7
MONUMENTATION: Survey Disk VM#: 627
AGENCY: PID#: CK0695
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set in NE corner of cement foundation of Building No. 3, the
superintendentss residence, the more westerly residence, 74.8 feet (22.8 m) west
of a northern brick foundation, 46.1 feet (14.1 m) SSW of center of 2.0 foot
(0.6 m) diameter pine tree, 39.3 feet (12.0 m) SW of junction of two concrete
walkways, and 34.6 feet (10.5) south of unnumbered power pole. The bench mark
is set flush in cement foundation and has been painted over, obliterating the
stamping.
BENCH MARK STAMPING: 11 1944
MONUMENTATION: Survey Disk VM#: 628
AGENCY: PID#: CK0700
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set in top of the NE corner of 1.6 x 8.5 x 5 concrete slab
which was the lower north step on the east side of a demolished recreational
hall, 185.2 feet (56.4 m) NE of Bench Mark 0870 J 1977, 146.4 feet (44.6 m) SSE
of unnumbered pole, 102.0 feet (31.1 m) east of centerline of road and 11.0 feet
(3.4 m) NNE of witness post with sign. The bench mark is set flush in concrete
slab, 0.5 foot (0.2 m) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
PUBLICATION DATE: 05/16/1984
Station ID: 8670870 SUPERCEDED DATE: 04/21/2003
Name: FORT PULASKI NATIONAL MONUMENT, SAVANNAH RIVER
GEORGIA
NOAA Chart: 11513 Latitude: 32° 2.0' N
USGS Quad: FORT PULASKI Longitude: 80° 54.1' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 1 1949
MONUMENTATION: Survey Disk VM#: 629
AGENCY: PID#: CK0692
SETTING CLASSIFICATION: Concrete Abutment
The bench mark is set at the north end of concrete bridge over South Channel of
Savannah River, at entrance to Fort Pulaski National Monument, 12.0 feet (3.7 m)
east of centerline of bridge, 10.6 feet (3.2 m) west of unnumbered telephone
pole with cable junction box, 3.6 feet (1.1 m) south of fourth guard post fron
NE end of concrete approach guard railing, 1.0 foot (0.3 m) west of center of
concrete banister, and 0.7 foot (0.2 m) above bridge pavement.
BENCH MARK STAMPING: NO 2 1949
MONUMENTATION: Survey Disk VM#: 630
AGENCY: PID#: CK0691
SETTING CLASSIFICATION: Concrete Bridge Abutment
The bench mark is set at the south end of concrete bridge over South Channel of
Savannah River, at entrance to Fort Pulaski National Monument, 48.6 feet (14.8
m) NE of the last power pole (#5-35), 11.2 feet (3.4 m) east of centerline of
bridge, 0.7 foot (0.2 m) west of the fourth concrete guard post from SE end of
concrete approach guard railing, and 0.5 foot (0.2 m) above bridge pavement.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
PUBLICATION DATE: 05/16/1984
Station ID: 8670870 SUPERCEDED DATE: 04/21/2003
Name: FORT PULASKI NATIONAL MONUMENT, SAVANNAH RIVER
GEORGIA
NOAA Chart: 11513 Latitude: 32° 2.0' N
USGS Quad: FORT PULASKI Longitude: 80° 54.1' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: N 323 1974
MONUMENTATION: Survey Disk VM#: 631
AGENCY: PID#: CK0693
SETTING CLASSIFICATION: Copper-Clad Steel Rod
The bench mark is located in Fort Pulaski National Monument near the base of a
100 foot (30 m) high radio tower, 124.7 feet (38.0 m) SE of the intersection of
two paved roads, one in front and the other from behind the maintenance
building, 121.4 feet (37.0 m) SW of the east corner of the gas station/storage
building, 48.7 feet (14.8 m) south of the south corner of the maintenance
building, and 2.8 feet (0.9 m) SW of the middle of the SW side of a 7.8 x 7.8
concrete base of radio tower. The bench mark is 0.1 foot (.03 m) below ground
level, crimped to a copper-coated steel rod, driven 64 feet (20 m) to refusal,
and encased in a 4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: P 323 1974
MONUMENTATION: Survey Disk VM#: 632
AGENCY: PID#: CK0694
SETTING CLASSIFICATION: Copper-Clad Steel Rod
The bench mark is located near the Savannah Bar Pilots Residence 213.3 feet
(65.0 m) west of Bench Mark 5, 152.0 feet (46.3 m) north of the NE corner of the
Park Rangers House, 76.6 feet (23.3 m) SSW of the SW corner of the Savannah Bar
Pilot Residence, 13.2 feet (4.0 m) WNW of the center of an unnumbered power pole
with a transformer and two guy wires, 4.3 feet (1.3 m) east of the west guy
wire, 4.1 feet (1.2 m) east of a metal witness post. The bench mark is 0.1 foot
(.03 m) below ground level, crimped to a copper-coated steel rod driven 56 feet
(17 m) 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 5 of 8
PUBLICATION DATE: 05/16/1984
Station ID: 8670870 SUPERCEDED DATE: 04/21/2003
Name: FORT PULASKI NATIONAL MONUMENT, SAVANNAH RIVER
GEORGIA
NOAA Chart: 11513 Latitude: 32° 2.0' N
USGS Quad: FORT PULASKI Longitude: 80° 54.1' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0870 J 1977
MONUMENTATION: Survey Disk VM#: 633
AGENCY: PID:
SETTING CLASSIFICATION: Copper-Clad Steel Rod
The bench mark is 228.0 feet (69.5 m) NE of the NE corner of National Park
Service maintenance garage, 139.0 feet (42.4 m) north of the centerline of the
road leading to National Park Service maintenance garage, 17.0 feet (5.2 m) west
of centerline of asphalt road leading to Savannah Bar Pilots Residence and boat
dock, 1.7 feet (0.5 m) NNE of witness post with sign, 1.2 feet (0.4 m) SSW of
unnumbered power pole. The bench mark is 0.3 foot (0.1 m) above ground level,
crimped to a copper-coated steel rod, driven 64 feet (20 m) to refusal and
encased in 4-inch PVC pipe and concrete kickblock. The bench mark has been hit
by a lawnmower and is bent.
BENCH MARK STAMPING: 0870 K 1977
MONUMENTATION: Survey Disk VM#: 634
AGENCY: PID#: CK5786
SETTING CLASSIFICATION: Copper-Clad Steel Rod
The bench mark is located near the Savannah Bar Pilots Residence 110.8 feet
(33.8 m) WNW of SW edge of concrete pier leading from Pilots Residence to Pilot
Boat dock, 99.0 feet (30.2 m) NNW of continuous water monitoring station (Well
38Q-2 Well NO 6), 85.7 feet (26.1 m) north of Bench Mark P 323 1974, 75.9 feet
(23.1 m) NW of the NE corner of Savannah Bar Pilot Residence, and 9.5 feet (2.9
m) south of concrete bulkhead. The bench mark is 0.3 foot (0.1 m) above ground
level crimped to a copper-coated steel rod rod driven 7 feet (2 m) to refusal
and encased in PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
PUBLICATION DATE: 05/16/1984
Station ID: 8670870 SUPERCEDED DATE: 04/21/2003
Name: FORT PULASKI NATIONAL MONUMENT, SAVANNAH RIVER
GEORGIA
NOAA Chart: 11513 Latitude: 32° 2.0' N
USGS Quad: FORT PULASKI Longitude: 80° 54.1' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0870 L 1978
MONUMENTATION: Survey Disk VM#: 635
AGENCY: PID#: CK5785
SETTING CLASSIFICATION: Concrete Post
The bench mark is located near the intersection of two paved roads, one leading
to the Pilot Dock, the other to the Fort, in a clearing between two palmetto
trees, 0.15 mile (0.24 km) west of the brick columns leading to the Fort, 24.8
feet (76 m) SW of the centerline of the paved road leading to the gage site, 7.3
feet (2.2 m) ESE of a 2.0 foot (0.6 m) diameter palmetto tree, 5.2 feet (1.6 m)
west of a 2.5 foot (0.8 m) diameter palmetto tree, 2.5 feet (0.8 m) NE of tree
line. The bench mark is 0.1 foot (0.03 m) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
PUBLICATION DATE: 05/16/1984
Station ID: 8670870 SUPERCEDED DATE: 04/21/2003
Name: FORT PULASKI NATIONAL MONUMENT, SAVANNAH RIVER
GEORGIA
NOAA Chart: 11513 Latitude: 32° 2.0' N
USGS Quad: FORT PULASKI Longitude: 80° 54.1' W
T I D A L D A T U M S
Tidal datums at FORT PULASKI NATIONAL MONUMENT, SAVANNAH RIVER based on:
LENGTH OF SERIES: 17 YEARS
TIME PERIOD: 1960-1978
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (10/14/1947) = 11.15
MEAN HIGHER HIGH WATER MHHW = 7.47
MEAN HIGH WATER MHW = 7.10
MEAN TIDE LEVEL MTL = 3.66
* NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 3.38
MEAN LOW WATER MLW = 0.22
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (03/20/1936) = -4.35
* NGVD reference based on adjustment of 1963 and NOS levels of1983.
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
5 12.75 5.65
7 10.99 3.89
11 1944 11.59 4.49
NO 1 1949 12.89 5.79
NO 2 1949 12.74 5.64
N 323 1974 10.08 2.98
P 323 1974 12.29 5.19
0870 J 1977 11.64 4.54
0870 K 1977 13.33 6.23
0870 L 1978 9.77 2.67
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
PUBLICATION DATE: 05/16/1984
Station ID: 8670870 SUPERCEDED DATE: 04/21/2003
Name: FORT PULASKI NATIONAL MONUMENT, SAVANNAH RIVER
GEORGIA
NOAA Chart: 11513 Latitude: 32° 2.0' N
USGS Quad: FORT PULASKI Longitude: 80° 54.1' 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.