Published Bench Mark Sheet for 8661989 BENNETT'S DOCK, PAWLEYS ISLAND CREEK SOUTH CAROLINA
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 09/16/1988
Station ID: 8661989 SUPERCEDED DATE: 04/21/2003
Name: BENNETT'S DOCK, PAWLEYS ISLAND CREEK
SOUTH CAROLINA
NOAA Chart: 11535 Latitude: 33° 26.1' N
USGS Quad: WAVERLY MILLS Longitude: 79° 7.6' W
To reach the tidal bench marks from the intersection of U.S. Highway 17 and
State Road 46, proceed SE on State Road 46 (also known as North Causeway Road)
for 0.35 mile (0.56 km) to the bridge over Pawleys Island Creek. The bench
marks are on the bridge and along State Road 46. The tide gage and staff were
located about 0.1 mile (0.2 km) NW of the bridge on a dock owned by the Bennett
family.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: BD NO 1 1975
MONUMENTATION: Survey Disk VM#: 3901
AGENCY: PID#: DD1411
SETTING CLASSIFICATION: Concrete/Rod Monument
The bench mark is set in concrete atop a steel rod driven to refusal across the
dirt road from the Bennett house, about 270 feet (82 m) west of State Road 46,
78.7 feet (24.0 m) NW of the NW corner of Clayer and Littlejon house, 50.4 feet
(15.4 m) SW of a 2.0-foot (0.6 m) diameter oak tree, 17.8 feet (5.4 m) south of
the centerline of the dirt road, 1.6 feet (0.5 m) south of utility pole # AD5,
and 0.4 foot (0.1 m) below ground level.
BENCH MARK STAMPING: PAW 1962
MONUMENTATION: Survey Disk VM#: 3898
AGENCY: PID#: DD2842
SETTING CLASSIFICATION: Sidewalk
The bench mark is set in the sidewalk on the west side of the bridge, 2.4 feet
(0.7 m) north of the south end of the sidewalk, 2.2 feet (0.7 m) east of the SE
edge of the banister, and 1.9 feet (0.6 m) west of the east edge of the
sidewalk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 09/16/1988
Station ID: 8661989 SUPERCEDED DATE: 04/21/2003
Name: BENNETT'S DOCK, PAWLEYS ISLAND CREEK
SOUTH CAROLINA
NOAA Chart: 11535 Latitude: 33° 26.1' N
USGS Quad: WAVERLY MILLS Longitude: 79° 7.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: PAW NO 1 1962
MONUMENTATION: Survey Disk VM#: 3899
AGENCY: PID#: DD4218
SETTING CLASSIFICATION: Sidewalk
The bench mark is set in the sidewalk on the east side of the bridge, 16.8 feet
(5.1 m) east of the centerline of the road, 3.4 feet (1.0 m) east of the west
edge of the sidewalk, 1.2 feet (0.4 m) north of the south end of the sidewalk,
and 0.7 foot (0.2 m) west of the east end of the banister.
BENCH MARK STAMPING: PAW NO 2 1962
MONUMENTATION: Survey Disk VM#: 3900
AGENCY: PID#: DD4219
SETTING CLASSIFICATION: Sidewalk
The bench mark is set in the sidewalk on the west side of the bridge, 33.9 feet
(10.3 m) north of the south end of the sidewalk, 16.3 feet (5.0 m) west of the
centerline of the road, 2.4 feet (0.7 m) west of the east side of the sidewalk,
and 0.6 foot (0.2 m) east of the banister.
BENCH MARK STAMPING: BD NO 2 1975
MONUMENTATION: Survey Disk VM#: 3902
AGENCY: PID#: DD1404
SETTING CLASSIFICATION: Concrete Slab
The bench mark is set in a concrete slab at the television tower in the SW
corner of Edward P. Mills property, about 360 feet (110 m) NW of Bench Mark BD
NO 1 1975, 54.5 feet (16.6 m) east of the centerline of the drive leading to
Mills residence, 51.2 feet (15.6 m) WSW of the south corner of the house, 43.6
feet (13.3 m) WNW of a 2.5-foot (0.8 m) diameter live oak tree, 33.3 feet (10.1
m) SSE of the west corner of the house, 0.7 foot (0.2 m) NNW of the NW leg of
the television tower, and 0.7 foot (0.2 m) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 09/16/1988
Station ID: 8661989 SUPERCEDED DATE: 04/21/2003
Name: BENNETT'S DOCK, PAWLEYS ISLAND CREEK
SOUTH CAROLINA
NOAA Chart: 11535 Latitude: 33° 26.1' N
USGS Quad: WAVERLY MILLS Longitude: 79° 7.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1989 G 1982
MONUMENTATION: Survey Disk VM#: 3903
AGENCY: PID#: DD1410
SETTING CLASSIFICATION: Stainless Steel Rod
The bench mark is on the east side of State Road 46 north of the bridge, 55.8
feet (17.0 m) ENE of the centerline of the road, 45.3 feet (13.8 m) SSW of the
SW corner of a house, 18.0 feet (5.5 m) east of the easternmost gate post for an
asphalt drive to a two story wooden house, 17.0 feet (5.2 m) north of the
centerline of the drive to Rosa's residence, and 3.2 feet (1.0 m) SE of utility
pole #23487. The bench mark is crimped to a stainless steel rod driven 24 feet
(7 m) to refusal and encased in a 5-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 09/16/1988
Station ID: 8661989 SUPERCEDED DATE: 04/21/2003
Name: BENNETT'S DOCK, PAWLEYS ISLAND CREEK
SOUTH CAROLINA
NOAA Chart: 11535 Latitude: 33° 26.1' N
USGS Quad: WAVERLY MILLS Longitude: 79° 7.6' W
T I D A L D A T U M S
Tidal datums at BENNETT'S DOCK, PAWLEYS ISLAND CREEK based on:
LENGTH OF SERIES: 4 MONTHS
TIME PERIOD: AUGUST - NOVEMBER 1975
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8662746 SOUTH ISLAND PLANTATION
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (10/05/1975) = 6.06
MEAN HIGHER HIGH WATER (MHHW) = 4.41
MEAN HIGH WATER (MHW) = 4.06
MEAN TIDE LEVEL (MTL) = 2.15
MEAN LOW WATER (MLW) = 0.24
MEAN LOWER LOW WATER (MLLW) = 0.00
LOWEST OBSERVED WATER LEVEL (11/22/1975) = -0.94
National Geodetic Vertical Datum (NGVD 29)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
BD NO 1 1975 8.51 4.45
PAW 1962 10.54 6.48
PAW NO 1 1962 10.58 6.52
PAW NO 2 1962 10.49 6.43
BD NO 2 1975 12.14 8.08
1989 G 1982 9.87 5.81
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 09/16/1988
Station ID: 8661989 SUPERCEDED DATE: 04/21/2003
Name: BENNETT'S DOCK, PAWLEYS ISLAND CREEK
SOUTH CAROLINA
NOAA Chart: 11535 Latitude: 33° 26.1' N
USGS Quad: WAVERLY MILLS Longitude: 79° 7.6' 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 (NAVD 88).
NGVD 29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD 29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD 29 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 NGVD 29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD 88 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. NAVD 88 replaces NGVD 29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD 88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD 29 and NAVD 88 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 NAVD 88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD 88 elevations.
The NAVD 88 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, NAVD 88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD 88 elevations listed for
each bench mark in the NGS database.
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