U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8667972 PUBLICATION DATE: 02/05/2004 Name: EDDINGS POINT CREEK SC NOAA Chart: 11519 Latitude: 32° 26.8' N ( 32.44670) USGS Quad: FROGMORE Longitude: 80° 32.0' W ( -80.53330) To reach the tidal bench marks from the post office in Frogmore, proceed east on U.S. Highway 21 for 1.3 km (0.8 mi) to Eddings Point Road (County Road S-7-74), then NNE on Eddings Point Road for 7.1 km (4.4 mi) to a sand drive with brick pillars at the entrance. The bench marks are along the fence line and at the Sutcliff residence. The tide gage and staff were located on the pier behind the Sutcliff residence. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 7972 A 1978 DESIGNATION: 866 7972 A TIDAL MONUMENTATION: Tidal Station disk VM#: 4420 AGENCY: National Ocean Survey (NOS) IDB PID#: CK2324 SETTING CLASSIFICATION: Galvanized steel rod OPUS PID: LATITUDE: 32° 26.8' N ( 32.44670) LONGITUDE: 80° 32.0' W ( -80.53330) The primary bench mark is a disk located at the NE side of a breezeway which is connected to a 2-story block house, 27.74 m (91.0 ft) SSW of the SE corner of a 2-story brick and wood house, 18.29 m (60.0 ft) NNW of the center of the entrance to a wooden pier, 11.58 m (38.0 ft) WNW of the edge of a 1 m (4 ft) bank (high water line), and 1.52 m (5.0 ft) NNE of the NE end of the breezeway. The bench mark is set at ground level, crimped to the top of a galvanized steel rod driven 13.7 m (45 ft) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8667972 PUBLICATION DATE: 02/05/2004 Name: EDDINGS POINT CREEK SC NOAA Chart: 11519 Latitude: 32° 26.8' N ( 32.44670) USGS Quad: FROGMORE Longitude: 80° 32.0' W ( -80.53330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7972 B 1978 DESIGNATION: 866 7972 B TIDAL MONUMENTATION: Tidal Station disk VM#: 4421 AGENCY: National Ocean Survey (NOS) IDB PID#: CK2325 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 32° 26.8' N ( 32.44670) LONGITUDE: 80° 32.0' W ( -80.53330) The bench mark is a disk set in a concrete monument in the front yard of a 2-story block house with breezeway, 48.46 m (159.0 ft) NNW of the SW corner of the block house, 21.92 m (71.9 ft) NNE of a 1 m (3 ft) water pipe sticking out of the ground, 3.66 m (12.0 ft) WNW of the centerline of a grassy drive, 1.74 m (5.7 ft) SSE of utility pole #61680 with transformer and yard light, and at ground level. BENCH MARK STAMPING: 7972 C 1978 DESIGNATION: 866 7972 C TIDAL MONUMENTATION: Tidal Station disk VM#: 4422 AGENCY: National Ocean Survey (NOS) IDB PID#: CK2323 SETTING CLASSIFICATION: Galvanized steel rod OPUS PID: LATITUDE: 32° 26.8' N ( 32.44670) LONGITUDE: 80° 32.1' W ( -80.53500) The bench mark is a disk located near a brick pillar at the end of the pavement for Eddings Point Road, 28.35 m (93.0 ft) NNE of a fire hydrant, 10.36 m (34.0 ft) ENE of the centerline of the sand road, 2.96 m (9.7 ft) NNW of the brick pillar, 0.85 m (2.8 ft) NNW of the brick pillar, and 0.79 m (2.6 ft) WSW of a wooden fence. The bench mark is set 0.61 m (2.0 ft) above the sand road, crimped to the top of a galvanized steel rod driven 11.6 m (38 ft) to refusal, and encased in a 4-inch PVC pipe and kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8667972 PUBLICATION DATE: 02/05/2004 Name: EDDINGS POINT CREEK SC NOAA Chart: 11519 Latitude: 32° 26.8' N ( 32.44670) USGS Quad: FROGMORE Longitude: 80° 32.0' W ( -80.53330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7972 D 1978 DESIGNATION: 866 7972 D TIDAL MONUMENTATION: Tidal Station disk VM#: 4423 AGENCY: National Ocean Survey (NOS) IDB PID#: CK2327 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 32° 26.8' N ( 32.44670) LONGITUDE: 80° 32.1' W ( -80.53500) The bench mark is a disk set in a concrete monument located along the sand road near two 1 m (2 ft) diameter palmetto trees and a 0.3 m (1 ft) diameter leaning oak tree, 85 m (279 ft) SSE of bench mark 7972 E 1978, 84 m (276 ft) NNW of bench mark 7972 C 1978, 6.40 m (21.0 ft) ENE of the centerline of the sand road leading NW, and 0.61 m (2.0 ft) above the sand road. BENCH MARK STAMPING: 7972 E 1978 DESIGNATION: 866 7972 E TIDAL MONUMENTATION: Tidal Station disk VM#: 4424 AGENCY: National Ocean Survey (NOS) IDB PID#: CK2326 SETTING CLASSIFICATION: Galvanized steel rod OPUS PID: LATITUDE: 32° 26.8' N ( 32.44670) LONGITUDE: 80° 32.1' W ( -80.53500) The bench mark is a disk located near the north entrance drive to the 2-story block house near a brick monument, 18.90 m (62.0 ft) NNE of utility pole #267974, 7 m (23 ft) NNW of the centerline of the sand drive leading to the block house, 6.71 m (22.0 ft) NE of the centerline of the sand road leading NW, and 0.91 m (3.0 ft) WNW of the NE end of the brick monument. The bench mark is set 6 cm (0.2 ft) above ground level, crimped to the top of a galvanized steel rod driven 12.5 m (41 ft), and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8667972 PUBLICATION DATE: 02/05/2004 Name: EDDINGS POINT CREEK SC NOAA Chart: 11519 Latitude: 32° 26.8' N ( 32.44670) USGS Quad: FROGMORE Longitude: 80° 32.0' W ( -80.53330) T I D A L D A T U M S Tidal datums at EDDINGS POINT CREEK based on: LENGTH OF SERIES: 1 YEAR TIME PERIOD: March 1978 - February 1979 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8667999 BEAUFORT Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (07/19/1978) = 2.650 MEAN HIGHER HIGH WATER MHHW = 2.129 MEAN HIGH WATER MHW = 2.018 North American Vertical Datum NAVD88 = 1.179 MEAN SEA LEVEL MSL = 1.121 MEAN TIDE LEVEL MTL = 1.041 MEAN LOW WATER MLW = 0.064 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (01/29/1979) = -0.850 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 7972 A 1978 2.723 0.705 7972 B 1978 2.796 0.778 7972 C 1978 3.559 1.541 7972 D 1978 3.602 1.584 7972 E 1978 3.318 1.300
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8667972 PUBLICATION DATE: 02/05/2004 Name: EDDINGS POINT CREEK SC NOAA Chart: 11519 Latitude: 32° 26.8' N ( 32.44670) USGS Quad: FROGMORE Longitude: 80° 32.0' W ( -80.53330) 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.