U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8661139 PUBLICATION DATE: 02/26/2004 Name: BUCKSPORT, WACCAMAW RIVER SC NOAA Chart: 11535 Latitude: 33° 38.8' N ( 33.64670) USGS Quad: BUCKSVILLE Longitude: 79° 5.7' W ( -79.09500) To reach the tidal bench marks from the junction of U.S. Highway 501 and State Highway 378 (SC 378) in Conway, proceed east on SC 378 for 0.3 km (0.2 mi) to U.S. Highway 701, turn right and go south on U.S. Highway 701 for 18.3 km (11.4 mi) to State Road S 26 48, turn left and go east on S 26 48 for 5.1 km (3.2 mi) to the roads end at Bucksport Marina. The bench marks are located on the marina grounds. The tide gage and staff were located 0.2 km (0.1 mi) SE of the roads end at the large tin boat shed. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: BUCKS NO 7 1975 DESIGNATION: 866 1139 TIDAL BUCKS 7 MONUMENTATION: Tidal Station disk VM#: 580 AGENCY: National Ocean Survey (NOS) IDB PID#: DD2368 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID#: DD2368 LATITUDE: 33° 39.0' N ( 33.65000) LONGITUDE: 79° 5.8' W ( -79.09670) The primary bench mark is a disk located at Bucksport Marina, 62.27 m (204.3 ft) NW of bench mark BUCKS NO 6 1975, 40.84 m (134.0 ft) ENE of the SE corner of an abandoned wood shingle house with brick foundation, 14.81 m (48.6 ft) NW of a 1 m (3 ft) diameter oak tree, 9.85 m (32.3 ft) NE of the centerline of the dirt road extension of S 26 48, and 1.13 m (3.7 ft) NE of utility pole #275. The bench mark is set 12 cm (0.4 ft) below ground, crimped to a copper-clad steel rod driven an unspecified depth 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: 8661139 PUBLICATION DATE: 02/26/2004 Name: BUCKSPORT, WACCAMAW RIVER SC NOAA Chart: 11535 Latitude: 33° 38.8' N ( 33.64670) USGS Quad: BUCKSVILLE Longitude: 79° 5.7' W ( -79.09500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: BUCKS NO 6 1975 DESIGNATION: 866 1139 TIDAL BUCKS 6 MONUMENTATION: Tidal Station disk VM#: 582 AGENCY: National Ocean Survey (NOS) IDB PID#: DD2369 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 33° 39.0' N ( 33.65000) LONGITUDE: 79° 5.7' W ( -79.09500) The bench mark is a disk located at Bucksport Marina, 53.89 m (176.8 ft) west of the southernost of two "Phillips 66" signs, 23.20 m (76.1 ft) east of the centerline of the dirt road extension of S 26 48, 11.22 m (36.8 ft) north of the centerline of a dirt road leading to a tin boat wharf, and 2.4 m (5.7 ft) north of utility pole 2X3. The bench mark is crimped to a copper-clad steel rod driven an unspecified depth to refusal, and encased in a 4-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: 1139 A 1982 DESIGNATION: 866 1139 A TIDAL MONUMENTATION: Tidal Station disk VM#: 583 AGENCY: National Ocean Survey (NOS) IDB PID#: DD2370 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 33° 39.0' N ( 33.65000) LONGITUDE: 79° 5.7' W ( -79.09500) The bench mark is set in the top of a concrete monument at Bucksport Marina, 54.86 m (180.0 ft) east of bench mark BUCKS NO 6 1975, 23.59 m (77.4 ft) north of a double trunk oak tree, 20.42 m (67.0 ft) west of the river edge, 12.19 m (40.0 ft) east of the centerline of the dirt road leading from the boat ramp to the marina store, and 0.52 m (1.7 ft) SE of the SE face of the concrete base of the southernmost of two Phillips 66 signs.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8661139 PUBLICATION DATE: 02/26/2004 Name: BUCKSPORT, WACCAMAW RIVER SC NOAA Chart: 11535 Latitude: 33° 38.8' N ( 33.64670) USGS Quad: BUCKSVILLE Longitude: 79° 5.7' W ( -79.09500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 1139 C 1982 DESIGNATION: 866 1139 TIDAL C MONUMENTATION: Tidal Station disk VM#: 584 AGENCY: National Ocean Survey (NOS) IDB PID#: DD2366 SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: DD2366 LATITUDE: 33° 39.0' N ( 33.65000) LONGITUDE: 79° 5.8' W ( -79.09670) The bench mark is a disk located at Bucksport Marina, 56.88 m (186.6 ft) SW of the SW face of the two-story garage and marina store, 12.44 m (40.8 ft) SE of the centerline of a road leading around the north side of the garage and marina store, 7.86 m (25.8 ft) NE of the centerline of S 26 48, and 0.49 m (1.6 ft) NW of a pole marked 9283. The bench mark is crimped to a stainless steel rod driven 7.6 m (25 ft) 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 4 of 5 Station ID: 8661139 PUBLICATION DATE: 02/26/2004 Name: BUCKSPORT, WACCAMAW RIVER SC NOAA Chart: 11535 Latitude: 33° 38.8' N ( 33.64670) USGS Quad: BUCKSVILLE Longitude: 79° 5.7' W ( -79.09500) T I D A L D A T U M S Tidal datums at BUCKSPORT, WACCAMAW RIVER based on: LENGTH OF SERIES: 15 YEARS TIME PERIOD: January 1977 - December 1991 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8665530 CHARLESTON, COOPER RIVER ENTRANCE Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (03/27/1983) = 1.821 MEAN HIGHER HIGH WATER MHHW = 0.746 MEAN HIGH WATER MHW = 0.710 MEAN SEA LEVEL MSL = 0.433 MEAN TIDE LEVEL MTL = 0.381 North American Vertical Datum NAVD88 = 0.151 MEAN LOW WATER MLW = 0.052 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (03/17/1983) = -0.767 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW BUCKS NO 7 1975 4.098 3.388 BUCKS NO 6 1975 3.796 3.086 1139 A 1982 2.102 1.392 1139 C 1982 4.413 3.703
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8661139 PUBLICATION DATE: 02/26/2004 Name: BUCKSPORT, WACCAMAW RIVER SC NOAA Chart: 11535 Latitude: 33° 38.8' N ( 33.64670) USGS Quad: BUCKSVILLE Longitude: 79° 5.7' W ( -79.09500) 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.