U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 07/31/1984
Station ID: 8673962 SUPERCEDED DATE: 04/21/2003
Name: GOULD LANDING, HARRIS NECK, BARBOUR ISLAND RIVER
GEORGIA
NOAA Chart: 11511 Latitude: 31° 37.2' N
USGS Quad: SHELLMANS BLUFF Longitude: 81° 15.8' W
To reach the tidal bench marks from the intersection of U.S. Route 17 and State
Route 131 in South Newport, Georgia, travel 7.0 miles (11.3 km) east on State
Route 131 until the road ends, then continue on a sand and dirt road to a fixed
bridge (causeway) located at the eastern border of the Harris Neck National
Wildlife Refuge and Barbour Island River. The bench marks are lcoated along the
road on the east side of the bridge. The tide gage and staff were located on a
dock at Gould Landing, SW of the bridge.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 3962 A 1977
MONUMENTATION: Survey Disk VM#: 4790
AGENCY: PID:
SETTING CLASSIFICATION: Unspecified Deep Rod
The bench mark is located on the causeway, opposite the Harris Neck National
Wildlife Refuge, on the east side of Barbour Island River, 201.8 feet (61.5 m)
WNW of Bench Mark 3962 B 1977, 70.0 feet (21.3 m) west of the south corner of
the Barbour Island Marina, 32.5 feet (9.9 m) south of the south corner of the
bridge, and 1.9 feet (0.6 m) north of the first power pole east of the bridge.
The bench mark is crimped to the top of a rod driven 40.0 feet (12.2 m) to
refusal encased in a PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 3962 B 1977
MONUMENTATION: Survey Disk VM#: 4791
AGENCY: PID:
SETTING CLASSIFICATION: Unspecified Deep Rod
The bench mark is located on the causeway, opposite the Harris Neck National
Wildlife Refuge, 173.9 feet (53.0 m) NNE of Bench Mark 3962 C 1977, 55.3 feet
(16.9 m) NE from the north corner of a two story building, and 1.9 feet (0.6 m)
west of the second power pole, east of the bridge. The bench mark is crimped to
the top of a rod driven 40 feet (12.2 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
PUBLICATION DATE: 07/31/1984
Station ID: 8673962 SUPERCEDED DATE: 04/21/2003
Name: GOULD LANDING, HARRIS NECK, BARBOUR ISLAND RIVER
GEORGIA
NOAA Chart: 11511 Latitude: 31° 37.2' N
USGS Quad: SHELLMANS BLUFF Longitude: 81° 15.8' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3962 C 1977
MONUMENTATION: Survey Disk VM#: 4792
AGENCY: PID:
SETTING CLASSIFICATION: Unspecified Deep Rod
The bench mark is located on the causeway, opposite the Harris Neck National
Wildlife Refuge, 167.5 feet (51.1 m) NW of Bench Mark 1962 D 1977, 79.5 feet
(24.2 m) SW of the west corner of a two story building, 34.8 feet (10.6 m) SSE
from the south corner of the swimming pool, and 34.3 feet (10.5 m) WSW of the
third power pole. The bench mark is crimped to the top of a rod driven 40.0
feet (12.2 m) to refusal, and encased in a PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 3962 D 1977
MONUMENTATION: Survey Disk VM#: 4793
AGENCY: PID:
SETTING CLASSIFICATION: Unspecified Deep Rod
The bench mark is located on the causeway, opposite the Harris Neck National
Wildlife Refuge, 167.0 feet (51.0 m) NW of Bench Mark 3962 E 1977, and 118.0
feet (36.0 m) south of the south corner of a single story building. The bench
mark is crimped to the top of a rod driven 40 feet (12.2 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 3 of 5
PUBLICATION DATE: 07/31/1984
Station ID: 8673962 SUPERCEDED DATE: 04/21/2003
Name: GOULD LANDING, HARRIS NECK, BARBOUR ISLAND RIVER
GEORGIA
NOAA Chart: 11511 Latitude: 31° 37.2' N
USGS Quad: SHELLMANS BLUFF Longitude: 81° 15.8' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3962 E 1977
MONUMENTATION: Survey Disk VM#: 4794
AGENCY: PID:
SETTING CLASSIFICATION: Unspecified Deep Rod
The bench mark is located on the causeway, opposite Harris Neck National
Wildlife Refuge, 10.0 feet (3.0 m) SW of the centerline of a sand and dirt road,
6 feet (1.8 m) NE of the marsh and bears SE of the last power pole. The bench
mark is crimped to the top of a rod driven 56.0 feet (17.1 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 4 of 5
PUBLICATION DATE: 07/31/1984
Station ID: 8673962 SUPERCEDED DATE: 04/21/2003
Name: GOULD LANDING, HARRIS NECK, BARBOUR ISLAND RIVER
GEORGIA
NOAA Chart: 11511 Latitude: 31° 37.2' N
USGS Quad: SHELLMANS BLUFF Longitude: 81° 15.8' W
T I D A L D A T U M S
Tidal datums at GOULD LANDING, HARRIS NECK, BARBOUR ISLAND RIVER based on:
LENGTH OF SERIES: 92 HIGH WATERS & 93
TIME PERIOD: MAY 5-JUNE 21, 1977
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8720030 FERNANDINA BEACH, FLORIDA
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (06/01/1977) = 10.11
MEAN HIGHER HIGH WATER MHHW = 8.07
MEAN HIGH WATER MHW = 7.70
MEAN TIDE LEVEL MTL = 3.96
MEAN LOW WATER MLW = 0.22
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (05/04/1977) = -1.91
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
3962 A 1977 12.11 4.41
3962 B 1977 9.96 2.26
3962 C 1977 9.11 1.41
3962 D 1977 9.41 1.71
3962 E 1977 10.14 2.44
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 07/31/1984
Station ID: 8673962 SUPERCEDED DATE: 04/21/2003
Name: GOULD LANDING, HARRIS NECK, BARBOUR ISLAND RIVER
GEORGIA
NOAA Chart: 11511 Latitude: 31° 37.2' N
USGS Quad: SHELLMANS BLUFF Longitude: 81° 15.8' 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.