U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 4 PUBLICATION DATE: 11/21/1990 Station ID: 8664545 SUPERCEDED DATE: 04/21/2003 Name: COX'S PIER, WANDO RIVER SOUTH CAROLINA NOAA Chart: 11524 Latitude: 32° 55.6' N USGS Quad: CAINHOY Longitude: 79° 49.8' W To reach the tidal bench marks fron the intersection of U.S. Highway 17 and State Road 41, proceed NW on State Road 41 for 5.5 miles (8.9 km) to the junction of State Roads S-8-98 and S-8-33 in Cainhoy, go east on State Road S-8-33 for 0.05 mile (0.08 km) to State Road S-8-26, then 0.3 mile (0.5 km) south on State Road S-8-26 to the Post Office in Wando. The bench marks are at the Post Office and along the shore. The tide gage and staff were on the pier behind the Cox residence, about 0.05 mile (0.08 km) SE of the Post Office. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 4545 A 1976 MONUMENTATION: Survey Disk VM#: 4061 AGENCY: PID#: CJ0501 SETTING CLASSIFICATION: Copper-clad Steel Rod The bench mark is at the inshore end of the pier behind the Cox residence, 33.3 feet (10.1 m) NNE of a power pole on the pier with spot lights on it, 32.1 feet (9.8 m) NNE of the end of the pier, 28.5 feet (8.7 m) east of a 2.0-foot (0.6 m) diameter pecan tree, 20.8 feet (6.3 m) SE of a 1.5-foot (0.5 m) diameter magnolia tree, 14.3 feet (4.4 m) west of the edge of the marsh, and 3.2 feet (1.0 m) west of a witness post with sign. The bench mark is 1.8 feet (0.5 m) below the ground, crimped to a copper-clad steel rod driven 22 feet (7 m) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: 4545 C 1976 MONUMENTATION: Survey Disk VM#: 4062 AGENCY: PID#: CJ0504 SETTING CLASSIFICATION: Copper-clad Steel Rod The bench mark is about 300 feet (91 m) south of the Post Office, 49.0 feet (14.9 m) ESE of the SE corner of the porch of a one-story wood frome house with brick foundation, 32.6 feet (9.9 m) SE of a 1.5-foot (0.5 m) diameter pecan tree in the yard of a private residence, 11.7 feet (3.6 m) west of the center- line of State Road S-8-26, 5.0 feet (1.5 m) north of the corner post of a wire link fence, and 3.4 feet (1.0 m) north of power pole #177455. The bench mark is level with the ground, crimped to a copper-clad steel rod driven 32 feet (10 m) 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 4 PUBLICATION DATE: 11/21/1990 Station ID: 8664545 SUPERCEDED DATE: 04/21/2003 Name: COX'S PIER, WANDO RIVER SOUTH CAROLINA NOAA Chart: 11524 Latitude: 32° 55.6' N USGS Quad: CAINHOY Longitude: 79° 49.8' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4545 D 1976 MONUMENTATION: Survey Disk VM#: 4063 AGENCY: PID#: CJ0502 SETTING CLASSIFICATION: Copper-clad Steel Rod The bench mark is at the south end of State Road S-8-26 about 750 feet (229 m) south of the Post Office, 150 feet (46 m) west of the end of State Road S-8-26, 14.1 feet (4.3 m) NW of a 2.5-foot (0.8 m) diameter oak tree, 7.9 feet (2.4 m) south of the centerline of a dirt road, and 2.9 feet (0.9 m) SW of power pole #188980. The bench mark is level with the ground, crimped to a copper-clad steel rod driven 27 feet (8 m) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: 4545 E 1982 MONUMENTATION: Survey Disk VM#: 4064 AGENCY: PID#: CJ0500 SETTING CLASSIFICATION: Stainless Steel Rod The bench mark is at a power pole across the road from the Post Office, 125.4 feet (38.2 m) ENE of the NE corner of the Post Office, 108.1 feet (32.9 m) NNE of power pole #34344, 88.7 feet (27.0 m) SE of State Road S-8-26, 2.5 feet (0.8 m) south of power pole #34306, and 1.0 foot (0.3 m) west of a witness post with sign. The bench mark is level with the ground, crimped to a stainless steel rod driven 32 feet (10 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 3 of 4 PUBLICATION DATE: 11/21/1990 Station ID: 8664545 SUPERCEDED DATE: 04/21/2003 Name: COX'S PIER, WANDO RIVER SOUTH CAROLINA NOAA Chart: 11524 Latitude: 32° 55.6' N USGS Quad: CAINHOY Longitude: 79° 49.8' W T I D A L D A T U M S Tidal datums at COX'S PIER, WANDO RIVER based on: LENGTH OF SERIES: 12 MONTHS TIME PERIOD: MAY 1988-APRIL 1989 TIDAL EPOCH: 1960-1978 CONTROL TIDE STATION: 8665530 CHARLESTON Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET: HIGHEST OBSERVED WATER LEVEL (06/01/1977) = 8.46 MEAN HIGHER HIGH WATER MHHW = 6.65 MEAN HIGH WATER MHW = 6.34 MEAN TIDE LEVEL MTL = 3.27 MEAN LOW WATER MLW = 0.19 MEAN LOWER LOW WATER MLLW = 0.00 LOWEST OBSERVED WATER LEVEL (04/07/1989) = -2.50 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW 4545 A 1976 8.56 2.22 4545 C 1976 17.94 11.60 4545 D 1976 16.05 9.71 4545 E 1982 18.66 12.32
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 4 PUBLICATION DATE: 11/21/1990 Station ID: 8664545 SUPERCEDED DATE: 04/21/2003 Name: COX'S PIER, WANDO RIVER SOUTH CAROLINA NOAA Chart: 11524 Latitude: 32° 55.6' N USGS Quad: CAINHOY Longitude: 79° 49.8' 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 (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 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.