U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8672667 PUBLICATION DATE: 07/12/2012
Name: RANGE A LIGHT, ICWW, BEAR R.
GA
NOAA Chart: 11511 Latitude: 31° 47.6' N ( 31.79330)
USGS Quad: OAK LEVEL Longitude: 81° 10.9' W ( -81.18170)
To reach the tidal bench marks proceed by boat, on Bear River (Intracoastal
Waterway) to the supporting structure of Range Front Light A (FL R 4 sec), north
of St. Catherine Sound. The bench marks are located on a strip of marsh
adjacent ot the light structure, bordered on the west by Kilkenny Creek and on
the east by the Intracoastal Waterway. The tide gage and staff were mounted on
the light structure, offshore of the marsh.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 2667 A 1977
DESIGNATION: 867 2667 A 1977
MONUMENTATION: Survey disk VM#: 4740
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified deep rod OPUS PID#: BBCR75
LATITUDE: 31° 47.6' N ( 31.79353) LONGITUDE: 81° 11.0' W ( -81.18267)
The bench mark is a disk located on a strip of marsh, adjacent to Range Front
Light A (FL R 4 sec) between Kilkenny Creek and Bear River (ICWW), 1.22 m (4.0
ft) SW of a witness post, and bears west of the light structure. The mark is
set atop an unspecified deep rod driven 9.75 m (32.0 ft) to refusal, encased in
a 4-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8672667 PUBLICATION DATE: 07/12/2012
Name: RANGE A LIGHT, ICWW, BEAR R.
GA
NOAA Chart: 11511 Latitude: 31° 47.6' N ( 31.79330)
USGS Quad: OAK LEVEL Longitude: 81° 10.9' W ( -81.18170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2667 B 1977
DESIGNATION: 867 2667 B 1977
MONUMENTATION: Survey disk VM#: 4741
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified deep rod OPUS PID:
LATITUDE: 31° 47.6' N ( 31.79322) LONGITUDE: 81° 11.0' W ( -81.18300)
The bench mark is a disk located on a strip of marsh adjacent to Range Front
Light A between Kilkenny Creek and Bear River (ICWW), 35.45 m (116.3 ft) south
of Bench Mark 2667 A 1977, and bears west of the light structure. The mark is
set atop an unspecified deep rod driven 12.19 m (40.0 ft) to refusal, encased in
a 4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 2267 C 1977
DESIGNATION: 867 2667 C 1977
MONUMENTATION: Survey disk VM#: 4742
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified deep rod OPUS PID:
LATITUDE: 31° 47.6' N ( 31.79297) LONGITUDE: 81° 10.9' W ( -81.18131)
The bench mark is a disk located on a strip of marsh adjacent to Range Front
Light A between Kilkenny Creek and Bear River (ICWW), 31.70 m (104.0 ft) south
of Bench Mark 2667 B 1977, and bears west of the light structure. The mark is
set atop an unspecified deep rod driven 14.63 m (48.0 ft) to refusal, encased in
a 4-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8672667 PUBLICATION DATE: 07/12/2012
Name: RANGE A LIGHT, ICWW, BEAR R.
GA
NOAA Chart: 11511 Latitude: 31° 47.6' N ( 31.79330)
USGS Quad: OAK LEVEL Longitude: 81° 10.9' W ( -81.18170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2667 D 1977
DESIGNATION: 867 2667 D 1977
MONUMENTATION: Survey disk VM#: 4743
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified deep rod OPUS PID:
LATITUDE: 31° 47.6' N ( 31.79283) LONGITUDE: 81° 11.0' W ( -81.18325)
The bench mark is a disk located on a strip of marsh adjacent to Range Front
Light A between Kilkenny Creek and Bear River (ICWW), 37.34 m (122.5 ft) SW of
Bench Mark 2667 C 1977, and bears west of the light structure. The mark is set
atop an unspecified deep rod driven 14.63 m (48.0 ft) to refusal, encased in a
4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 2667 E 1977
DESIGNATION: 867 2667 E 1977
MONUMENTATION: Survey disk VM#: 4744
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified deep rod OPUS PID:
LATITUDE: 31° 47.6' N ( 31.79275) LONGITUDE: 81° 11.0' W ( -81.18369)
The bench mark is a disk located on a strup of marsh adjacent to Range Front
Light A between Kilkenny Creek and Bear River (ICWW), 36.58 m (120.0 ft) west of
Bench Mark 2667 D 1977, 1.83 m (6.0 ft) south of a witness post, and bears west
of the structure. The mark is set atop an unspecified deep rod driven 14.63 m
(48.0 ft) to refusal, encased in a 4-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8672667 PUBLICATION DATE: 07/12/2012
Name: RANGE A LIGHT, ICWW, BEAR R.
GA
NOAA Chart: 11511 Latitude: 31° 47.6' N ( 31.79330)
USGS Quad: OAK LEVEL Longitude: 81° 10.9' W ( -81.18170)
T I D A L D A T U M S
Tidal datums at RANGE A LIGHT, ICWW, BEAR R. based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: February 2012 - April 2012
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8670870 FORT PULASKI, SAVANNAH RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 2.421
MEAN HIGH WATER MHW = 2.308
MEAN SEA LEVEL MSL = 1.261
MEAN TIDE LEVEL MTL = 1.186
MEAN LOW WATER MLW = 0.064
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
2667 A 1977 3.171 0.863
2667 B 1977 3.277 0.969
2267 C 1977 3.250 0.942
2667 D 1977 3.213 0.905
2667 E 1977 3.244 0.936
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8672667 PUBLICATION DATE: 07/12/2012
Name: RANGE A LIGHT, ICWW, BEAR R.
GA
NOAA Chart: 11511 Latitude: 31° 47.6' N ( 31.79330)
USGS Quad: OAK LEVEL Longitude: 81° 10.9' W ( -81.18170)
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.