U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8669246 PUBLICATION DATE: 06/28/2023
Name: BRIGHTON BEACH
SC
NOAA Chart: 11516 Latitude: 32° 12.8' N ( 32.21410)
USGS Quad: BLUFFTON Longitude: 80° 50.8' W ( -80.84650)
To reach the tide station from the U.S. Post Office at 25 Thurmond Way,
Bluffton, SC 29910 head south on SC-46 (Bluffton Rd) for 0.80 km (0.5 mi), then
continue straight onto Boundary St for another 0.48 km (0.3 mi) to the
intersection with Bridge St / Alljoy Rd and turn left. Proceed ESE on Bridge St
/ Alljoy Rd for 2.9 km (1.8 mi) to the Alljoy Public boat launch parking lot.
Proceed east by foot to the wood fence on the east border of the parking area
and a gate to the adjacent property. This gate is the private entrance for the
Forrest Baughman residence dock. The tide station is located on the SE end of
the covered portion of the dock. The bench marks are located at the Alljoy
Public boat launch and within the town of Bluffton.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 9246 A 2021
DESIGNATION: 866 9246 A
MONUMENTATION: Tidal Station disk VM#: 24208
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete wall OPUS PID#: BBHS32
LATITUDE: 32° 12.9' N ( 32.21433) LONGITUDE: 80° 50.8' W ( -80.84700)
The primary bench mark is a disk located 47.50m (155.8 ft) South of the South
post for the DNR sign in the South portion of the parking lot, 6.90m (22.6 ft)
West of the centerline of the boat ramp, and 0.28m (0.9 ft) East of the Western
edge of the retaining wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8669246 PUBLICATION DATE: 06/28/2023
Name: BRIGHTON BEACH
SC
NOAA Chart: 11516 Latitude: 32° 12.8' N ( 32.21410)
USGS Quad: BLUFFTON Longitude: 80° 50.8' W ( -80.84650)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9246 B 2021
DESIGNATION: 866 9246 B
MONUMENTATION: Flange-encased Rod VM#: 24209
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 32° 12.9' N ( 32.21519) LONGITUDE: 80° 51.5' W ( -80.85856)
The bench mark is a stainless steel rod located 31.80m (104.3 ft) NE of the
centerline of Bridge St, 22.90m (75.1 ft) SE of the South corner of the Bluffton
Town Hall building, 9.80m (32.2 ft) NW of the center median for the entrance
road to the parking lot. The datum point is the top of a stainless steel rod
driven 10.10m (33.1 ft) to refusal, encased in a 0.13m (0.4 ft) NOS logo cap,
and recessed 0.08m (0.25 ft) below grade.
BENCH MARK STAMPING: 9103 J 1981
DESIGNATION: 866 9103 J
MONUMENTATION: Survey disk VM#: 24210
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 32° 14.0' N ( 32.23325) LONGITUDE: 80° 51.8' W ( -80.86303)
The bench mark is a disk set in a concrete monument located in the yard of the
May River Montessori School, 11.60m (38.0 ft) WNW of the centerline of Calhoune
St, 9.10m (30.0 ft) NNE of the center of Bridge St, 3.20m (10.5 ft) ENE of a
power pole, and recessed 0.05m (0.2 ft) below grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8669246 PUBLICATION DATE: 06/28/2023
Name: BRIGHTON BEACH
SC
NOAA Chart: 11516 Latitude: 32° 12.8' N ( 32.21410)
USGS Quad: BLUFFTON Longitude: 80° 50.8' W ( -80.84650)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9103 G 1978
DESIGNATION: 866 9103 G
MONUMENTATION: Survey disk VM#: 24211
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 32° 13.9' N ( 32.23239) LONGITUDE: 80° 51.8' W ( -80.86300)
The bench mark is a disk crimped to a stainless steel rod located 10.60m (35.0
ft) West of the SW corner of the porch to a large single story wood frame house,
6.80m (22.5 ft) North of the centerline of Allen St, 5.20m (17.5 ft) East of the
centerline of Calhoune St, and 0.50m (2.7 ft) NNE of power line pole.
BENCH MARK STAMPING: NO 5 1973
DESIGNATION: 866 9103 TIDAL 5
MONUMENTATION: Survey disk VM#: 24212
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 32° 13.9' N ( 32.23125) LONGITUDE: 80° 51.8' W ( -80.86342)
The bench mark is a disk set in a concrete monument along the brick fence in
front of a church, 13.10m (43.0 ft) NNW of a 60-inch oak tree, 9.40m (30.8 ft)
WNW of the centerline of the road, 9.10m (29.9 ft) SSW of the center of the
sidewalk to the front entrance of the church, and 0.60m (2.0 ft) ESE of the
brick fence in front of the church. The mark is set 0.20m (0.6 ft) above grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8669246 PUBLICATION DATE: 06/28/2023
Name: BRIGHTON BEACH
SC
NOAA Chart: 11516 Latitude: 32° 12.8' N ( 32.21410)
USGS Quad: BLUFFTON Longitude: 80° 50.8' W ( -80.84650)
T I D A L D A T U M S
Tidal datums at BRIGHTON BEACH based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: March 2022 - May 2022
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 = 2.525
MEAN HIGH WATER MHW = 2.403
North American Vertical Datum NAVD88 = 1.403
MEAN SEA LEVEL MSL = 1.300
MEAN TIDE LEVEL MTL = 1.236
MEAN LOW WATER MLW = 0.069
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
9246 A 2021 2.941 0.538
9246 B 2021 8.138 5.735
9103 J 1981 7.988 5.585
9103 G 1978 8.259 5.856
NO 5 1973 7.719 5.316
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8669246 PUBLICATION DATE: 06/28/2023
Name: BRIGHTON BEACH
SC
NOAA Chart: 11516 Latitude: 32° 12.8' N ( 32.21410)
USGS Quad: BLUFFTON Longitude: 80° 50.8' W ( -80.84650)
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.