U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8665763 PUBLICATION DATE: 07/14/2023
Name: HOLLYWOOD, WADMALAW RIVER
SC
NOAA Chart: 11522 Latitude: 32° 44.6' N ( 32.74254)
USGS Quad: WADMALAW ISLAND Longitude: 80° 10.3' W ( -80.17194)
To reach the tide station and bench marks from the US Post Office at 6345 SC-162
Hollywood, SC 29449, proceed east along State Highway 162 for 3.2 km (2.0 mi) to
the intersection with State Rd/Towles Rd then turn right and proceed SE along
State Rd/Towles Rd for 0.64 km (0.4 mi) to the intersection with Dixie
Plantation Rd and turn left. Proceed east on Dixie Plantation Rd for 2.3 km
(1.4 mi) to the Gate 4 entrance for the College of Charleston Stono Preserve on
the right. Proceed south through the gate then SE for 0.4 km (0.26 mi) to a
grassy road T-intersection and turn left. Proceed NE along the grassy road for
0.67 km (0.42 mi) to a pathway that leads down to the water along the
powerlines. The tidal bench marks are along the grassy road within the Stono
Preserve, along State Rd S, and State Highway 162. The tide gauge is located in
the tidal creek at the NE end of the Stono Preserve.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5763 B 2022
DESIGNATION: 866 5763 B
MONUMENTATION: Flange-encased Rod VM#: 24533
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBJC48
LATITUDE: 32° 44.4' N ( 32.73956) LONGITUDE: 80° 10.5' W ( -80.17575)
The mark is in the grass clearing north of the main house and to the SE of the
main two-track road, located 57.2 m (187.7 ft) NE of a utility pole with a flood
light and two guy wires, 50.0 m (164.0 ft) west of a 1.5 m (5 ft) tall wood post
in the NE corner of the clearing, 35.7 m (117.1 ft) SW of the trunk of a 12.2 m
(40.0 ft) tall black gum tree, and 24.1 m (79.1 ft) SE of the approximate
centerline of the two-track road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8665763 PUBLICATION DATE: 07/14/2023
Name: HOLLYWOOD, WADMALAW RIVER
SC
NOAA Chart: 11522 Latitude: 32° 44.6' N ( 32.74254)
USGS Quad: WADMALAW ISLAND Longitude: 80° 10.3' W ( -80.17194)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5763 C 2022
DESIGNATION: 866 5763 C
MONUMENTATION: Tidal Station disk VM#: 24534
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Sign Foundation OPUS PID:
LATITUDE: 32° 44.4' N ( 32.73989) LONGITUDE: 80° 10.9' W ( -80.18089)
The mark is located 14.5 m (47.6 ft) south of the approximate centerline of
Dixie Plantation road, 6.70 m (22.0 ft) west of the approximate centerline of
the main dirt road into the Stono Preserve, 5.00 m (16.4 ft) SE of utility pole
#506998, and 4.60 m (15.1 ft) north of a private property no trespassing sign.
BENCH MARK STAMPING: 10 328 1985
DESIGNATION: 10 328
MONUMENTATION: Horizontal Station disk VM#: 24535
AGENCY: National Geodetic Survey (NGS) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 44.2' N ( 32.73739) LONGITUDE: 80° 11.9' W ( -80.19914)
Bench mark is a concrete post recessed 0.3 m (1.0 ft) and 0.3 m (1.0 ft) below
the road, 7.90 m (25.9 ft) west of the SE end of a pipe fence, 5.40 m (17.7 ft)
NE of the center of the road, and 4.80 m (15.7 ft) SSW of a metal sign (private
property college of Charleston Foundation).
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8665763 PUBLICATION DATE: 07/14/2023
Name: HOLLYWOOD, WADMALAW RIVER
SC
NOAA Chart: 11522 Latitude: 32° 44.6' N ( 32.74254)
USGS Quad: WADMALAW ISLAND Longitude: 80° 10.3' W ( -80.17194)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 10 329 1985
DESIGNATION: 10 329
MONUMENTATION: Horizontal Station disk VM#: 24536
AGENCY: National Geodetic Survey (NGS) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID#: CK4294
LATITUDE: 32° 44.0' N ( 32.73264) LONGITUDE: 80° 11.6' W ( -80.19336)
The mark is a brass disk set in a concrete post flush with the ground and 0.2 m
(0.7 ft) below the road, 28.8 m (94.5 ft) north of the north corner of the NW
one of two brick pillars for the gate, 26.8 m (87.9 ft) SE of a power pole
number 314014, 22.2 m (72.8 ft) NW of the center of the field access road, 7.30
m (24.0 ft) NNW of the telephone junction box number 35, and 6.60 m (21.7 ft) SW
of the center of the road.
BENCH MARK STAMPING: VERT 10 193 1983
DESIGNATION: 10 193
MONUMENTATION: Survey disk VM#: 24537
AGENCY: South Carolina Geodetic Survey (SCGS) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 45.0' N ( 32.75003) LONGITUDE: 80° 10.4' W ( -80.17306)
The mark is an aluminum disk set in a concrete post set 0.60 m (2.0 ft) below
highway 162, located 8.00 m (26.3 ft) NNW of the centerline of highway 162, 5.00
m (16.5 ft) SSE of a blazed 24-inch pine tree, 1.70 m (5.6 ft) ENE of power pole
number 0288128, and 0.80 m (2.6 ft) SW from a witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8665763 PUBLICATION DATE: 07/14/2023
Name: HOLLYWOOD, WADMALAW RIVER
SC
NOAA Chart: 11522 Latitude: 32° 44.6' N ( 32.74254)
USGS Quad: WADMALAW ISLAND Longitude: 80° 10.3' W ( -80.17194)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5763 A 2022
DESIGNATION: 866 5763 A
MONUMENTATION: Tidal Station disk VM#: 24538
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Sidewalk OPUS PID:
LATITUDE: 32° 44.6' N ( 32.74253) LONGITUDE: 80° 10.3' W ( -80.17219)
The mark is located 26.5 ft (8.1 m) south of the trail marker labeled 'East Loop
0.4/1.3 mi', 15.2 m (49.9 ft) SW of utility pole #437610, 1.8 m (6.0 ft) east of
the west edge of the trail border railroad tie, and 41 cm (16 inches) west of
the east edge of the trail border railroad tie.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8665763 PUBLICATION DATE: 07/14/2023
Name: HOLLYWOOD, WADMALAW RIVER
SC
NOAA Chart: 11522 Latitude: 32° 44.6' N ( 32.74254)
USGS Quad: WADMALAW ISLAND Longitude: 80° 10.3' W ( -80.17194)
T I D A L D A T U M S
Tidal datums at HOLLYWOOD, WADMALAW RIVER based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: January 2023 - March 2023
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8665530 CHARLESTON, COOPER RIVER ENTRANCE
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (12/22/2022) = 2.615
MEAN HIGHER HIGH WATER MHHW = 1.954
MEAN HIGH WATER MHW = 1.859
MEAN SEA LEVEL MSL = 1.071
North American Vertical Datum NAVD88 = 1.060
MEAN TIDE LEVEL MTL = 0.942
MEAN LOW WATER MLW = 0.026
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/21/2023) = -0.019
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5763 B 2022 8.282 6.423
5763 C 2022 8.665 6.806
10 328 1985 9.225 7.366
10 329 1985 4.795 2.936
VERT 10 193 1983 9.225 7.366
5763 A 2022 4.984 3.125
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8665763 PUBLICATION DATE: 07/14/2023
Name: HOLLYWOOD, WADMALAW RIVER
SC
NOAA Chart: 11522 Latitude: 32° 44.6' N ( 32.74254)
USGS Quad: WADMALAW ISLAND Longitude: 80° 10.3' W ( -80.17194)
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.