U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8663535 PUBLICATION DATE: 03/09/2004 Name: QUINBY BRIDGE, QUINBY CREEK SC NOAA Chart: Latitude: 33° 5.7' N ( 33.09500) USGS Quad: HUGER Longitude: 79° 48.5' W ( -79.80830) To reach the tidal bench marks from the intersection of State Highway 41 and County Road S-8-98 (Cainhoy Road) in Huger, proceed 0.2 km (0.1 mi) SW on County Road S-8-98 to the bridge over Quinby Creek. The tidal bench marks are on the bridge and along County Road S-8-98 north of the bridge. The tide gage and staff were on the east side of the bridge. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 866 C 3535 1976 DESIGNATION: 866 3535 C TIDAL MONUMENTATION: Tidal Station disk VM#: 3989 AGENCY: National Ocean Survey (NOS) IDB PID#: DD1205 SETTING CLASSIFICATION: Copper clad steel rod OPUS PID: LATITUDE: 33° 5.7' N ( 33.09500) LONGITUDE: 79° 48.5' W ( -79.80830) The primary bench mark is a disk located near an historical marker at the east end of a boat ramp parking area at the Quinby Creek bridge, 59.04 m (193.7 ft) ENE of the NE corner of the bridge, 8.66 m (28.4 ft) SSE of a 1 m (3 ft) diameter twin trunk oak tree, 8.35 m (27.4 ft) NNW of the centerline of County Road S-8-98, 1.46 m (4.8 ft) SW of an historical marker, and 0.88 m (2.9 ft) NNE of a metal witness post. The bench mark is set 3 cm (1 ft) below road level, crimped to the top of a copper-clad steel rod driven 7.0 m (23 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 2 of 5 Station ID: 8663535 PUBLICATION DATE: 03/09/2004 Name: QUINBY BRIDGE, QUINBY CREEK SC NOAA Chart: Latitude: 33° 5.7' N ( 33.09500) USGS Quad: HUGER Longitude: 79° 48.5' W ( -79.80830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 3535 A 1976 DESIGNATION: 866 3535 A TIDAL MONUMENTATION: Tidal Station disk VM#: 3987 AGENCY: National Ocean Survey (NOS) IDB PID#: DD1203 SETTING CLASSIFICATION: Bridge abutment OPUS PID: LATITUDE: 33° 5.7' N ( 33.09500) LONGITUDE: 79° 48.5' W ( -79.80830) The bench mark is a disk set in the south concrete abutment of the Quinby Creek bridge, 7.68 m (25.2 ft) ENE of the SW corner of the abutment across the road, 3.81 m (12.5 ft) ESE of the centerline of County Road S-8-98, 1.68 m (5.5 ft) NNE of the SE corner of the bridge, and 0.3 m (1 ft) above road level. BENCH MARK STAMPING: 3535 B 1976 DESIGNATION: 866 3535 B TIDAL MONUMENTATION: Tidal Station disk VM#: 3988 AGENCY: National Ocean Survey (NOS) IDB PID#: DD1204 SETTING CLASSIFICATION: Bridge abutment OPUS PID: LATITUDE: 33° 5.7' N ( 33.09500) LONGITUDE: 79° 48.5' W ( -79.80830) The bench mark is a disk set in the north concrete abutment of the Quinby Creek bridge, 28.32 m (92.9 ft) NNW of bench mark 3535 A 1976, 7.62 m (25.0 ft) WSW of the abutment across the road, 3.81 m (12.5 ft) west of the centerline of County Road S-8-98, 1.28 m (4.2 ft) SW of the NW bridge abutment, and 0.3 m (1 ft) above road level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8663535 PUBLICATION DATE: 03/09/2004 Name: QUINBY BRIDGE, QUINBY CREEK SC NOAA Chart: Latitude: 33° 5.7' N ( 33.09500) USGS Quad: HUGER Longitude: 79° 48.5' W ( -79.80830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 3535 F 1982 DESIGNATION: 866 3535 F TIDAL MONUMENTATION: Tidal Station disk VM#: 3991 AGENCY: National Ocean Survey (NOS) IDB PID#: DD1206 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 33° 5.7' N ( 33.09500) LONGITUDE: 79° 48.3' W ( -79.80500) The bench mark is a disk located in the SW corner of the intersection of State Highway 41 and County Road S-8-98, 29.32 m (96.2 ft) NNE of bench mark VERT 8 092 1984, 20.42 m (67.0 ft) SSE of the centerline of County Road S-8-98, 15.91 m (52.2 ft) west of the centerline of State Highway 41, 10.88 m (35.7 ft) ESE of the NE corner of a 1 m (4 ft) square concrete storm drain, and 2.44 m (8.0 ft) NNW of a 1 m (3 ft) diameter pine tree. The bench mark is set 3 cm (1 ft) below road level, crimped to the top of a stainless steel rod driven 8.2 m (27 ft) to refusal, and encased in a 5-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: VERT 8 092 1984 DESIGNATION: 8 092 MONUMENTATION: Bench Mark disk VM#: 3992 AGENCY: South Carolina Geodetic Society (SCGS) IDB PID#: DD1207 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 33° 5.7' N ( 33.09500) LONGITUDE: 79° 48.3' W ( -79.80500) The bench mark is a disk set in a concrete monument near a power pole in the SW corner of the intersection of State Highway 41 and County Road S-8-98, 48.34 m (158.6 ft) SSW of the centerline of County Road S-8-98, 20.18 m (66.2 ft) WNW of the centerline of State Highway 41, 7.53 m (24.7 ft) SSW of a blazed 0.61 m (2.0 ft) diameter pine tree, 1.92 m (6.3 ft) NNE of the power pole, 0.49 m (1.6 ft) ESE of a witness post, and 0.61 m (2.0 ft) below highway level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8663535 PUBLICATION DATE: 03/09/2004 Name: QUINBY BRIDGE, QUINBY CREEK SC NOAA Chart: Latitude: 33° 5.7' N ( 33.09500) USGS Quad: HUGER Longitude: 79° 48.5' W ( -79.80830) T I D A L D A T U M S Tidal datums at QUINBY BRIDGE, QUINBY CREEK based on: LENGTH OF SERIES: 4 MONTHS TIME PERIOD: September 1976 - December 1976 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8663665 RICHMOND PLANTATION, E. BR. COOPER RIVER Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.981 MEAN HIGH WATER MHW = 0.921 MEAN SEA LEVEL MSL = 0.562 MEAN TIDE LEVEL MTL = 0.502 North American Vertical Datum NAVD88 = 0.182 MEAN LOW WATER MLW = 0.082 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 866 C 3535 1976 1.689 0.768 3535 A 1976 2.245 1.324 3535 B 1976 2.246 1.325 3535 F 1982 6.521 5.600 VERT 8 092 1984 6.457 5.536
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8663535 PUBLICATION DATE: 03/09/2004 Name: QUINBY BRIDGE, QUINBY CREEK SC NOAA Chart: Latitude: 33° 5.7' N ( 33.09500) USGS Quad: HUGER Longitude: 79° 48.5' W ( -79.80830) 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.