U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 PUBLICATION DATE: 06/27/1989 Station ID: 8661609 SUPERCEDED DATE: 04/21/2003 Name: OAKS CREEK ENTRANCE, MURRELLS INLET SOUTH CAROLINA NOAA Chart: 11535 Latitude: 33° 31.8' N USGS Quad: BROOKGREEN Longitude: 79° 2.6' W To reach the tidal bench marks from the surfaced ramp in the town of Murrells Inlet, proceed by boat south on the dredged channel for about 2.7 statue miles (4.3 km) to the entrance of Oaks Creek, continue west on Oaks Creek for 0.5 mile (0.8 km) to the NE end of Drunken Jack Island. The tidal bench marks are along the NE side and end of Drunken Jack Island. The tide gage and staff were on a small offshore structure in the middle of the creek. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: O.C.I. NO 2 1975 MONUMENTATION: Survey Disk VM#: 3839 AGENCY: PID: SETTING CLASSIFICATION: Copper-clad Steel Rod The bench mark is on an irregularly shaped mound on the NE end of Drunken Jack Island, about 90 feet (27 m) south of Oaks Creek, about 90 feet (27 m) east of a slough, and 6.9 feet (2.1 m) east of a metal witness post with sign. The bench mark is 2 feet (1 m) above marsh level, crimped to a copper-clad steel rod driven 46 feet (14 m) to refusal, and encased in a 4-inch PVC pipe. BENCH MARK STAMPING: O.C.I. NO 3 1975 MONUMENTATION: Survey Disk VM#: 3840 AGENCY: PID: SETTING CLASSIFICATION: Copper-clad Steel Rod The bench mark is on an irregularly shaped mound on the NE end of Drunken Jack Island, about 540 feet (165 m) SSE of Bench Mark O.C.I. NO 2 1975, 172 feet (52 m) WNW of Bench Mark O.C.I. NO 4 1975, 150 feet (46 m) south of a slough, about 120 feet (37 m) NE of the tree line, and 7.7 feet (2.3 m) SW of a metal witness post with sign. The bench mark is 2 feet (1 m) above marsh level, crimped to a copper-clad steel rod driven 40 feet (12 m) to refusal, and encased in a 4-inch PVC pipe.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 PUBLICATION DATE: 06/27/1989 Station ID: 8661609 SUPERCEDED DATE: 04/21/2003 Name: OAKS CREEK ENTRANCE, MURRELLS INLET SOUTH CAROLINA NOAA Chart: 11535 Latitude: 33° 31.8' N USGS Quad: BROOKGREEN Longitude: 79° 2.6' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: O.C.I. NO 4 1975 MONUMENTATION: Survey Disk VM#: 3841 AGENCY: PID: SETTING CLASSIFICATION: Copper-clad Steel Rod The bench mark is on the NE side of Drunken Jack Island, about 630 feet (192 m) south of Oaks Creek, 438 feet (134 m) ESE of Bench Mark O.C.I. NO 5 1975, about 30 feet (9 m) east of the tree line, about 15 feet (5 m) SSW of a lone scrub pine tree, and 11.6 feet (3.5 m) west of a metal witness post. The bench mark is crimped to a copper-clad steel rod driven 50 feet (15 m) to substantial resistance, and encased in a 4-inch PVC pipe. BENCH MARK STAMPING: O.C.I. NO 5 1975 MONUMENTATION: Survey Disk VM#: 3842 AGENCY: PID: SETTING CLASSIFICATION: Copper Pipe The bench mark is brazed to the top of a 3.5 foot (1.1 m) long 2-inch copper pipe in the center of a 50-foot (15 m) diameter low mound on the NE side of Drunken Jack Island, about 300 feet (91 m) west of Bench Mark O.C.I. NO 3 1975, about 210 feet (64 m) south of a slough, about 90 feet (27 m) north of the tree line, 5.3 feet (1.6 m) east of a metal witness post with sign, 5.0 feet (1.5 m) east of a lone pine tree, and 0.5 foot (0.2 m) above grade.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 PUBLICATION DATE: 06/27/1989 Station ID: 8661609 SUPERCEDED DATE: 04/21/2003 Name: OAKS CREEK ENTRANCE, MURRELLS INLET SOUTH CAROLINA NOAA Chart: 11535 Latitude: 33° 31.8' N USGS Quad: BROOKGREEN Longitude: 79° 2.6' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: MSL 5.535 MONUMENTATION: Survey Disk VM#: 3843 AGENCY: PID: SETTING CLASSIFICATION: Concrete Monument The bench mark is set in a 10-inch tile pipe filled with concrete on the western point of a small marsh island just NE of Drunken Jack Island, about 135 feet (41 m) east of the channel between the two islands, and about 45 feet (14 m) south of Oaks Creek. Note: Use with caution, a 1982 recovery found the mark projecting 3.5 feet (1.1 m) above grade. BENCH MARK STAMPING: NO STAMPING 1 MONUMENTATION: Survey Disk VM#: 3844 AGENCY: PID: SETTING CLASSIFICATION: Concrete Monument The bench mark is set in a 8-inch square terra cotta pipe filled with concrete, 476 feet (145 m) SSE of Bench Mark O.C.I. NO 2 1975, 126 feet (38 m) NW of Bench Mark O.C.I. NO 3 1975, 3.0 feet (0.9 m) north of a metal witness post with sign, and 1.0 foot (0.3 m) east of a COE witness post.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 PUBLICATION DATE: 06/27/1989 Station ID: 8661609 SUPERCEDED DATE: 04/21/2003 Name: OAKS CREEK ENTRANCE, MURRELLS INLET SOUTH CAROLINA NOAA Chart: 11535 Latitude: 33° 31.8' N USGS Quad: BROOKGREEN Longitude: 79° 2.6' W T I D A L D A T U M S Tidal datums at OAKS CREEK ENTRANCE, MURRELLS INLET based on: LENGTH OF SERIES: 7 MONTHS TIME PERIOD: MAY - NOVEMBER 1975 TIDAL EPOCH: 1960-1978 CONTROL TIDE STATION: 8661559 SMITHS DOCK Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET: HIGHEST OBSERVED WATER LEVEL (06/10/1975) = 7.16 MEAN HIGHER HIGH WATER MHHW = 4.88 MEAN HIGH WATER MHW = 4.51 MEAN TIDE LEVEL MTL = 2.35 MEAN LOW WATER MLW = 0.20 MEAN LOWER LOW WATER MLLW = 0.00 LOWEST OBSERVED WATER LEVEL (11/22/1975) = -1.08 Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW O.C.I. NO 2 1975 6.44 1.93 O.C.I. NO 3 1975 5.64 1.13 O.C.I. NO 4 1975 6.63 2.12 O.C.I. NO 5 1975 7.77 3.26 MSL 5.535 7.24 2.73 NO STAMPING 1 5.04 0.53
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 PUBLICATION DATE: 06/27/1989 Station ID: 8661609 SUPERCEDED DATE: 04/21/2003 Name: OAKS CREEK ENTRANCE, MURRELLS INLET SOUTH CAROLINA NOAA Chart: 11535 Latitude: 33° 31.8' N USGS Quad: BROOKGREEN Longitude: 79° 2.6' 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 (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.