U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8671315 PUBLICATION DATE: 12/19/2018
Name: PRIEST LANDING, WILMINGTON RIVER
GA
NOAA Chart: 11512 Latitude: 31° 57.8' N ( 31.96330)
USGS Quad: ISLE OF HOPE Longitude: 81° 0.7' W ( -81.01170)
To reach the tidal bench marks proceed to the Half Moon Reef Tide Station by
boat from Priest Landing. Proceed down Wilmington River toward Wassaw Sound.
When daybeacon "16" (Fl R 4sec 16 ft 3M) is abeam to port, come left to course
035 T and proceed 2.6 km (1.4 nm) to daybeacon "3". When daybeacon "3" is abeam
to port, come left to course 332 T. Stay on this course 3.1 km (1.7 nm) to Half
Moon Reef Fish Haven. The tide gauge is secured to the SW pile marking the Fish
Haven and the tide staff is secured to the NW pile. The benchmarks are located
on the beach due north of the Fish Haven.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 1315 B 1994
DESIGNATION: 867 1315 B
MONUMENTATION: Survey disk VM#: 15758
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete pier OPUS PID:
LATITUDE: 31° 57.8' N ( 31.96330) LONGITUDE: 81° 0.7' W ( -81.01170)
The bench mark is a disk set in concrete located at the western end of the
Priest Landing pier, 17.83 m (58.5 ft) east of a lamppost at the eastern edge of
the parking lot, 14.78 m (48.5 ft) NE of the fire hydrant at the eastern corner
of the parking lot, and 0.91 m (3.0 ft) north of the water main valve at the
western end of the pier.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8671315 PUBLICATION DATE: 12/19/2018
Name: PRIEST LANDING, WILMINGTON RIVER
GA
NOAA Chart: 11512 Latitude: 31° 57.8' N ( 31.96330)
USGS Quad: ISLE OF HOPE Longitude: 81° 0.7' W ( -81.01170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1315 C 1994
DESIGNATION: 867 1315 C
MONUMENTATION: Survey disk VM#: 15759
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete OPUS PID:
LATITUDE: 31° 57.8' N ( 31.96330) LONGITUDE: 81° 0.7' W ( -81.01170)
The bench mark is a disk set flush in concrete, located at the eastern corner of
the warehouse in the parking lot at Priest Landing, 37.49 m (123.0 ft) west of
fire hydrant 1971 5 K11 at the end of the pier, 17.59 m (57.7 ft) NW of fire
hydrant 1969 R/L 1 in the SE end of the parking lot, and 0.37 m (1.2 ft) SE of
the east corner of the warehouse in the parking lot at the Priest Landing.
BENCH MARK STAMPING: 1315 D 1994
DESIGNATION: 867 1315 D
MONUMENTATION: Survey disk VM#: 15760
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete OPUS PID:
LATITUDE: 31° 57.8' N ( 31.96330) LONGITUDE: 81° 0.7' W ( -81.01170)
The bench mark is a disk set flush in concrete located in the vicinity of the
Priest Landing pier parking lot, 19.75 m (64.8 ft) east of Savannah Electric and
Power Co. Meter #D10680, 10.61 m (34.8 ft) SW of sewer manhole, and 4.27 m (14.0
ft) NW of General Electric power pole in the SW corner of the parking lot.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8671315 PUBLICATION DATE: 12/19/2018
Name: PRIEST LANDING, WILMINGTON RIVER
GA
NOAA Chart: 11512 Latitude: 31° 57.8' N ( 31.96330)
USGS Quad: ISLE OF HOPE Longitude: 81° 0.7' W ( -81.01170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1315 E 1994
DESIGNATION: 867 1315 E
MONUMENTATION: Survey disk VM#: 15761
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete OPUS PID:
LATITUDE: 31° 57.8' N ( 31.96330) LONGITUDE: 81° 0.7' W ( -81.01170)
The bench mark is a disk set flush in concrete located on the boat ramp adjacent
to the Priest Landing parking lot, 26.27 m (86.2 ft) NE of the north corner of
the warehouse, 7.77 m (25.5 ft) SE of the light post on the NW corner of the
boat ramp, and 3.38 m (11.1 ft) from the center line of the boat ramp.
BENCH MARK STAMPING: BANK 1932
DESIGNATION: 867 1315 BANK
MONUMENTATION: Survey disk VM#: 15762
AGENCY: National Ocean Service (NOS) IDB PID#: BR1036
SETTING CLASSIFICATION: Concrete pier OPUS PID:
LATITUDE: 31° 57.8' N ( 31.96330) LONGITUDE: 81° 0.7' W ( -81.01170)
The bench mark is a disk set in concrete located at the end of the Priest
Landing pier, 8.56 m (28.1 ft) east of a western corner of the pier, 1.65 m (5.4
ft) NW of grating in center of the pier, 1.71 m (5.6 ft) west of the fourth
bollard from the NW end of the pier.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8671315 PUBLICATION DATE: 12/19/2018
Name: PRIEST LANDING, WILMINGTON RIVER
GA
NOAA Chart: 11512 Latitude: 31° 57.8' N ( 31.96330)
USGS Quad: ISLE OF HOPE Longitude: 81° 0.7' W ( -81.01170)
T I D A L D A T U M S
Tidal datums at PRIEST LANDING, WILMINGTON RIVER based on:
LENGTH OF SERIES: 30 DAYS
TIME PERIOD: Oct 4 1994 - Nov 2 1994
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 = 2.410
MEAN HIGH WATER MHW = 2.291
MEAN SEA LEVEL MSL = 1.218
MEAN TIDE LEVEL MTL = 1.181
MEAN LOW WATER MLW = 0.071
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
1315 B 1994 4.306 2.015
1315 C 1994 4.859 2.568
1315 D 1994 4.427 2.136
1315 E 1994 4.396 2.105
BANK 1932 4.291 2.000
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8671315 PUBLICATION DATE: 12/19/2018
Name: PRIEST LANDING, WILMINGTON RIVER
GA
NOAA Chart: 11512 Latitude: 31° 57.8' N ( 31.96330)
USGS Quad: ISLE OF HOPE Longitude: 81° 0.7' W ( -81.01170)
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.