U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8669601 PUBLICATION DATE: 04/01/2004 Name: PINE ISLAND, RAMSHORN CREEK SC NOAA Chart: 11512 Latitude: 32° 7.3' N ( 32.12170) USGS Quad: FORT PULASKI Longitude: 80° 53.9' W ( -80.89830) To reach the tidal bench marks by boat from the ramp at Harbour Town, Hilton Head Island, proceed NW across Calibogue Sound to Cooper River, then proceed SW on Cooper River for 6.0 km (3.7 mi) to Ramshorn Creek, then proceed south on Ramshorn Creek for 1.3 km (0.8 mi) to Pine Island. The bench marks are located on Pine Island. The tide gage and staff were located on an offshore platform on the west side of the creek. Note: Care should be taken to anchor the boat offshore of the clay bank, which is exposed at low water. The wake from a passing vessel can literally lift a small craft onto these banks, causing it to become stranded. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 9601 D 1980 DESIGNATION: 866 9601 D TIDAL MONUMENTATION: Tidal Station disk VM#: 4673 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 32° 7.3' N ( 32.12170) LONGITUDE: 80° 53.9' W ( -80.89830) The primary bench mark is a disk located 8.96 m (29.4 ft) north of a palmetto tree on the bluff edge, 6.28 m (20.6 ft) WNW of a 0.46 m (1.5 ft) diameter pine tree, 5.97 m (19.6 ft) ESE of a double oak tree, 2.41 m (7.9 ft) ESE of a witness post, and 0.91 m (3.0 ft) south of a witness post with a sign. The bench mark is set 6 cm (0.2 ft) below ground level, crimped to the top of a stainless steel rod driven 12.2 m (40 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: 8669601 PUBLICATION DATE: 04/01/2004 Name: PINE ISLAND, RAMSHORN CREEK SC NOAA Chart: 11512 Latitude: 32° 7.3' N ( 32.12170) USGS Quad: FORT PULASKI Longitude: 80° 53.9' W ( -80.89830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9601 A 1980 DESIGNATION: 866 9601 A TIDAL MONUMENTATION: Tidal Station disk VM#: 4672 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 32° 7.3' N ( 32.12170) LONGITUDE: 80° 53.9' W ( -80.89830) The bench mark is a disk located 18 m (59 ft) SE of a cluster of five oak trees, 8.84 m (29.0 ft) NE of a 0.61 m (2.0 ft) diameter oak tree, 5.12 m (16.8 ft) WNW of the bluff edge, and 0.55 m (1.8 ft) SE of a metal witness post with sign. The bench mark is set 6 cm (0.2 ft) below ground level, crimped to the top of a stainless steel rod driven 12.2 m (40 ft) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: 9601 F 1981 DESIGNATION: 866 9601 F TIDAL MONUMENTATION: Tidal Station disk VM#: 4674 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 32° 7.3' N ( 32.12170) LONGITUDE: 80° 53.9' W ( -80.89830) The bench mark is a disk set in a concrete monument, 68.28 m (224.0 ft) ENE of bench mark 9601 G 1981, 42.82 m (140.5 ft) WSW of bench mark 9601 A 1980, 3.38 m (11.1 ft) south of 0.30 m (1.0 ft) diameter oak tree, and 0.52 m (1.7 ft) NE of a metal witness post with sign.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8669601 PUBLICATION DATE: 04/01/2004 Name: PINE ISLAND, RAMSHORN CREEK SC NOAA Chart: 11512 Latitude: 32° 7.3' N ( 32.12170) USGS Quad: FORT PULASKI Longitude: 80° 53.9' W ( -80.89830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9601 G 1981 DESIGNATION: 866 9601 G TIDAL MONUMENTATION: Tidal Station disk VM#: 4675 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 32° 7.3' N ( 32.12170) LONGITUDE: 80° 53.9' W ( -80.89830) The bench mark is a disk set in a concrete monument, 52.64 m (172.7 ft) NE of bench mark 9601 H 1981, 3.11 m (10.2 ft) SE of 0.55 m (1.8 ft) diameter forked trunk oak tree, and 0.64 m (2.1 ft) east of a metal witness post with sign. BENCH MARK STAMPING: 9601 H 1981 DESIGNATION: 866 9601 H TIDAL MONUMENTATION: Tidal Station disk VM#: 4676 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 32° 7.3' N ( 32.12170) LONGITUDE: 80° 53.9' W ( -80.89830) The bench mark is a disk set in a concrete monument, 45.57 m (149.5 ft) NNE of bench mark 9601 D 1980, 13.72 m (45.0 ft) ESE of 0.61 m (2.0 ft) diameter oak tree, 7.10 m (23.3 ft) WNW of a 0.61 m (2.0 ft) diameter loblolly pine tree, and 1.19 m (3.9 ft) NE of a metal witness post with sign.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8669601 PUBLICATION DATE: 04/01/2004 Name: PINE ISLAND, RAMSHORN CREEK SC NOAA Chart: 11512 Latitude: 32° 7.3' N ( 32.12170) USGS Quad: FORT PULASKI Longitude: 80° 53.9' W ( -80.89830) T I D A L D A T U M S Tidal datums at PINE ISLAND, RAMSHORN CREEK based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: September 1981 - November 1981 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 = 2.359 MEAN HIGH WATER MHW = 2.245 MEAN SEA LEVEL MSL = 1.233 MEAN TIDE LEVEL MTL = 1.153 MEAN LOW WATER MLW = 0.061 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 9601 D 1980 2.835 0.590 9601 A 1980 3.452 1.207 9601 F 1981 3.417 1.172 9601 G 1981 3.448 1.203 9601 H 1981 3.322 1.077
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8669601 PUBLICATION DATE: 04/01/2004 Name: PINE ISLAND, RAMSHORN CREEK SC NOAA Chart: 11512 Latitude: 32° 7.3' N ( 32.12170) USGS Quad: FORT PULASKI Longitude: 80° 53.9' W ( -80.89830) 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.