U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 4 Station ID: 8662071 PUBLICATION DATE: 06/28/2004 Name: PAWLEYS INLET, WARDS DOCK SC NOAA Chart: 11534 Latitude: 33° 24.7' N ( 33.41170) USGS Quad: WAVERLY MILLS Longitude: 79° 8.1' W ( -79.13500) To reach the tidal bench marks from the intersection of U.S. Highway 17 and State Road 46 in Pawleys Island, proceed SE on State Road 46 for 1.0 km (0.6 mi) to State Road 10, then SW on State Road 10 for 2.7 km (1.7 mi) to State Road 481, then SW on State Road 481 for 0.2 km (0.1 mi) to State Road 265. The bench marks are along State Roads 10, 481, and 265. The tide gage and staff were SSW of the junction of State Roads 481 and 265 at the end of Mr. R. Wards dock. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: WD NO 1 1975 DESIGNATION: 866 2071 TIDAL WD 1 MONUMENTATION: Tidal Station disk VM#: 3915 AGENCY: National Ocean Survey (NOS) IDB PID#: DD1422 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID#: DD1422 LATITUDE: 33° 24.7' N ( 33.41170) LONGITUDE: 79° 8.0' W ( -79.13330) The primary bench mark is a disk located on the SW side of State Road 265, south of the junction of State Roads 481 and 265, 19.29 m (63.3 ft) SSE of the SE pylon of a two-story frame house (Dudley residence), 12.59 m (41.3 ft) SW of the west corner of a cinder block support of a frame house (Ward residence), 8.26 m (27.1 ft) SSW of utility pole #ABB30/28272, 7.44 m (24.4 ft) ESE of the extended centerline of State Road 481, 4.02 m (13.2 ft) SSW of the centerline of State Road 265, and 1.25 m (4.1 ft) east of power line stub pole #28273. The bench mark is set flush with the ground, crimped to the top of a copper-clad steel rod driven an unspeci- fied depth to refusal, and encased in an ABS pipe with concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 4 Station ID: 8662071 PUBLICATION DATE: 06/28/2004 Name: PAWLEYS INLET, WARDS DOCK SC NOAA Chart: 11534 Latitude: 33° 24.7' N ( 33.41170) USGS Quad: WAVERLY MILLS Longitude: 79° 8.1' W ( -79.13500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: WD NO 3 1975 DESIGNATION: 866 2071 TIDAL WD 3 MONUMENTATION: Tidal Station disk VM#: 3917 AGENCY: National Ocean Survey (NOS) IDB PID#: DD1420 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 33° 24.7' N ( 33.41170) LONGITUDE: 79° 8.0' W ( -79.13330) The bench mark is a disk set in the "V" west of the junction of State Roads 10 and 481, 22 m (72 ft) north of the north corner of a ship-shaped house on cinder block stilts, 15 m (49 ft) NNE of utility pole #28243 with transformer, 5.91 m (19.4 ft) NW of the centerline of State Road 481, and 5.00 m (16.4 ft) SSE of the centerline of State Road 10. The bench mark is set flush with the ground, crimped to the top of a copper-clad steel rod driven an unspecified depth to refusal, and encased in an ABS pipe with concrete kickblock. BENCH MARK STAMPING: WD NO 4 1975 DESIGNATION: 866 2071 TIDAL WD 4 MONUMENTATION: Tidal Station disk VM#: 3918 AGENCY: National Ocean Survey (NOS) IDB PID#: DD1419 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID#: DD1419 LATITUDE: 33° 24.7' N ( 33.41170) LONGITUDE: 79° 7.9' W ( -79.13170) The bench mark is a disk set in the "V" west of the junction of State Roads 10 and 481, 25.79 m (84.6 ft) NNW of the west pylon of a house with tile siding (rental #85), 6.95 m (22.8 ft) SE of the centerline of State Road 10, 6.46 m (21.2 ft) WNW of the centerline of State Road 481, and 5.49 m (18.0 ft) SW of utility pole #28203. The bench mark is set 6 cm (0.2 ft) above ground, crimped to the top of a copper-clad steel rod driven an unspecified depth to refusal, and encased in an ABS pipe with concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 4 Station ID: 8662071 PUBLICATION DATE: 06/28/2004 Name: PAWLEYS INLET, WARDS DOCK SC NOAA Chart: 11534 Latitude: 33° 24.7' N ( 33.41170) USGS Quad: WAVERLY MILLS Longitude: 79° 8.1' W ( -79.13500) T I D A L D A T U M S Tidal datums at PAWLEYS INLET, WARDS DOCK based on: LENGTH OF SERIES: 7 Months TIME PERIOD: December 1975 - November 1976 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: MEAN HIGHER HIGH WATER MHHW = 1.165 MEAN HIGH WATER MHW = 1.068 MEAN SEA LEVEL MSL = 0.586 MEAN TIDE LEVEL MTL = 0.561 North American Vertical Datum NAVD88 = 0.524 MEAN LOW WATER MLW = 0.055 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW WD NO 1 1975 1.839 0.771 WD NO 3 1975 2.253 1.185 WD NO 4 1975 2.803 1.735
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 4 Station ID: 8662071 PUBLICATION DATE: 06/28/2004 Name: PAWLEYS INLET, WARDS DOCK SC NOAA Chart: 11534 Latitude: 33° 24.7' N ( 33.41170) USGS Quad: WAVERLY MILLS Longitude: 79° 8.1' W ( -79.13500) 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.