U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8669072 PUBLICATION DATE: 06/14/2010
Name: NEW RIVER, ROUTE 170 BRIDGE
SC
NOAA Chart: 11513 Latitude: 32° 14.2' N ( 32.23670)
USGS Quad: LIMEHOUSE Longitude: 81° 0.7' W ( -81.01170)
To reach the tidal bench marks from the intersection of U.S. 17 and S.C. Route
170 in Limehouse, proceed south and west along S.C. 170 for 6.3 km (3.9 mi) to
the highway bridge on S.C. 170 crossing over the New River. The bench marks are
on the north side of S.C. 170, NE and SW of the bridge. The tide station was on
the NW side of the bridge.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 9072 B 1979
DESIGNATION: 866 9072 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 4549
AGENCY: National Ocean Survey (NOS) IDB PID#: CK1950
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 32° 14.2' N ( 32.23670) LONGITUDE: 81° 0.8' W ( -81.01330)
The primary bench mark is a disk located on the north side of S.C. 170 near the
SW end of the bridge, 14.48 m (47.5 ft) SW of the SW bridge abutment, 6.68 m
(21.9 ft) NNW of the centerline of S.C. 170, 4.02 m (13.2 ft) SE of power pole
#13004, and 0.70 m (2.3 ft) SE of a steel witness post. The bench mark is set 3
cm (0.1 ft) above ground level, crimped to the top of a stainless steel rod
driven 4.5 m (15 ft) to refusal, and encased in 5-inch PVC pipe and concrete
kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8669072 PUBLICATION DATE: 06/14/2010
Name: NEW RIVER, ROUTE 170 BRIDGE
SC
NOAA Chart: 11513 Latitude: 32° 14.2' N ( 32.23670)
USGS Quad: LIMEHOUSE 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: 9072 A 1979
DESIGNATION: 866 9072 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 4548
AGENCY: National Ocean Survey (NOS) IDB PID#: CK1951
SETTING CLASSIFICATION: Concrete bridge abutment OPUS PID:
LATITUDE: 32° 14.2' N ( 32.23670) LONGITUDE: 81° 0.7' W ( -81.01170)
The bench mark is a disk set in the concrete bridge abutment on the north side
of S.C. 170 at the NE end of the bridge, 8.14 m (26.7 ft) NNW of the centerline
of S.C. 170, 5.24 m (17.2 ft) SSW of power pole #131005, 2.35 m (7.7 ft) west of
a sign for Jasper County, 0.40 m (1.3 ft) NNW of the bridge guard rail, and 0.61
m (2.0 ft) above ground level.
BENCH MARK STAMPING: 9072 C 1979
DESIGNATION: 866 9072 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 4550
AGENCY: National Ocean Survey (NOS) IDB PID#: CK1949
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 32° 14.2' N ( 32.23670) LONGITUDE: 81° 0.8' W ( -81.01330)
The bench mark is a disk located SW of the driveway leading to the boat ramp, 90
m (295 ft) SW of bench mark 9072 B 1979, 13.66 m (44.8 ft) SE of SE corner of
the concrete rest rooms, 10.73 m (35.2 ft) NNW of centerline of S.C. 170, 7.71 m
(25.3 ft) SW of the centerline of the driveway leading to the boat ramp, and
1.04 m (3.4 ft) NNW of steel witness post. The bench mark is set 3 cm (0.1 ft)
above ground level, crimped to the top of a stainless steel rod driven 5.4 m (18
ft) to refusal, and encased in 5-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8669072 PUBLICATION DATE: 06/14/2010
Name: NEW RIVER, ROUTE 170 BRIDGE
SC
NOAA Chart: 11513 Latitude: 32° 14.2' N ( 32.23670)
USGS Quad: LIMEHOUSE 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: 9072 D 1979
DESIGNATION: 866 9072 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 4551
AGENCY: National Ocean Survey (NOS) IDB PID#: CK1952
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 32° 14.2' N ( 32.23670) LONGITUDE: 81° 0.9' W ( -81.01500)
The bench mark is a disk located near the pavilion next to the boat ramp, 44.38
m (145.6 ft) NNW of bench mark 9072 C 1979, 12.13 m (39.8 ft) SW of the
centerline of the concrete boat ramp, 7.53 m (24.7 ft) SSE of the SW corner of
the pavilion, 1.55 m (5.1 ft) NNW of the north face of a 1.22 m x 1.22 m x 1.07
m (4.0 ft x 4.0 ft x 3.5 ft) cinderblock structure, and 1.16 m (3.8 ft) NE of a
power pole. The bench mark is set 6 cm (0.2 ft) below ground level, crimped to
the top of a stainless steel rod driven 9.1 m (30 ft) to refusal, and encased in
4-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8669072 PUBLICATION DATE: 06/14/2010
Name: NEW RIVER, ROUTE 170 BRIDGE
SC
NOAA Chart: 11513 Latitude: 32° 14.2' N ( 32.23670)
USGS Quad: LIMEHOUSE 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: G 76 1955
DESIGNATION: G 76
MONUMENTATION: Bench Mark disk VM#: 4552
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: CK0365
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 14.2' N ( 32.23670) LONGITUDE: 81° 0.7' W ( -81.01170)
The bench mark is a disk set in a concrete monument on the north side of S.C.
170, 114 m (375 ft) NE of the NE end of the bridge, 83.09 m (272.6 ft) ENE of
bench mark 9072 A 1979, 32 m (104 ft) SW of the center of a gate in the fence
line, 11.06 m (36.3 ft) NW of the centerline of S.C. 170, 10.21 m (33.5 ft) WSW
of the south face of SCEG power pole #249792, 2.93 m (9.6 ft) ESE of the fence
line, 0.37 m (1.2 ft) SE of witness post with sign, and 1.07 m (3.5 ft) below
the level of the highway
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8669072 PUBLICATION DATE: 06/14/2010
Name: NEW RIVER, ROUTE 170 BRIDGE
SC
NOAA Chart: 11513 Latitude: 32° 14.2' N ( 32.23670)
USGS Quad: LIMEHOUSE Longitude: 81° 0.7' W ( -81.01170)
T I D A L D A T U M S
Tidal datums at NEW RIVER, ROUTE 170 BRIDGE based on:
LENGTH OF SERIES: 7 MONTHS
TIME PERIOD: August 1979 - February 1980
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 = 1.154
MEAN HIGH WATER MHW = 1.120
MEAN SEA LEVEL MSL = 0.752
MEAN TIDE LEVEL MTL = 0.613
North American Vertical Datum NAVD88 = 0.400
MEAN LOW WATER MLW = 0.105
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
9072 B 1979 3.956 2.836
9072 A 1979 4.454 3.334
9072 C 1979 2.574 1.454
9072 D 1979 1.907 0.787
G 76 1955 2.228 1.108
Foot Notes:
Bench marks 9072 D 1979 and G 76955 are based on one differential leveling
connection and do not meet the quality control standards of the NOS. Therefore,
caution should be used when deriving elevations for these marks.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8669072 PUBLICATION DATE: 06/14/2010
Name: NEW RIVER, ROUTE 170 BRIDGE
SC
NOAA Chart: 11513 Latitude: 32° 14.2' N ( 32.23670)
USGS Quad: LIMEHOUSE 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.