U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8663781 PUBLICATION DATE: 03/09/2004 Name: FRENCH QUARTER CREEK SC NOAA Chart: 11527 Latitude: 33° 3.3' N ( 33.05500) USGS Quad: KITTREDGE Longitude: 79° 52.8' W ( -79.88000) To reach the tidal bench marks from the intersection of State Highway 41 and County Road S-8-98 (Cainhoy Road) in Huger, proceed SW on County Road S-8-98 for 7.4 km (4.6 mi) to the entrance gates of Blessing Plantation, then turn right and proceed west on the dirt entrance road (Blessing Lane) for 2.6 km (1.6 mi), crossing two wooden plank bridges to an abandoned loading dock at the end of the road. The bench marks are located along the entrance road and at the two bridges. The tide gage and staff were located at the offshore end of the loading dock. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 3781 A 1976 DESIGNATION: 866 3781 A TIDAL MONUMENTATION: Tidal Station disk VM#: 4022 AGENCY: National Ocean Survey (NOS) IDB PID#: DD1196 SETTING CLASSIFICATION: Copper clad steel rod OPUS PID: LATITUDE: 33° 3.3' N ( 33.05500) LONGITUDE: 79° 52.7' W ( -79.87830) The primary bench mark is a disk located near the second bridge leading to the creek, 16.76 m (55.0 ft) SSW of the SW corner of the bridge, 11.49 m (37.7 ft) SE of a lone 1 m (4 ft) diameter pine tree, and 4 m (13 ft) WNW of the approximate centerline of the road leading to the creek. The bench mark is set level with the road, crimped to the top of a copper-clad steel rod driven 7.6 m (25 ft) 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: 8663781 PUBLICATION DATE: 03/09/2004 Name: FRENCH QUARTER CREEK SC NOAA Chart: 11527 Latitude: 33° 3.3' N ( 33.05500) USGS Quad: KITTREDGE Longitude: 79° 52.8' W ( -79.88000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 3781 C 1976 DESIGNATION: 866 3781 C TIDAL MONUMENTATION: Tidal Station disk VM#: 4023 AGENCY: National Ocean Survey (NOS) IDB PID#: DD1195 SETTING CLASSIFICATION: Copper clad steel rod OPUS PID: LATITUDE: 33° 3.3' N ( 33.05500) LONGITUDE: 79° 52.7' W ( -79.87830) The bench mark is a disk located near the first bridge leading to the creek, 15.15 m (49.7 ft) NE of the NE corner of the bridge, 4 m (13 ft) NNW of the approximate centerline of the road leading to the creek, 1.95 m (6.4 ft) SW of a 1 m (4 ft) diameter pine tree (last tree on right before bridge), and 0.79 m (2.6 ft) SSE of a witness post. The bench mark is set level with the ground, crimped to the top of a copper-clad steel rod driven 7.9 m (26 ft) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: 3781 D 1976 DESIGNATION: 866 3781 D TIDAL MONUMENTATION: Tidal Station disk VM#: 4024 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper pipe surrounded by concrete OPUS PID: LATITUDE: 33° 3.3' N ( 33.05500) LONGITUDE: 79° 52.8' W ( -79.88000) The bench mark is a disk located on the south side of the road between the manor house and the first wooden bridge, 101 m (330 ft) NE of bench mark 3781 C 1976, 6.64 m (21.8 ft) SE of the entrance road, 3.90 m (12.8 ft) SSE of a 0.46 m (1.5 ft) diameter pine tree, and 3.20 m (10.5 ft) NNE of a 1 m (2 ft) diameter pine tree. The bench mark is brazed to the top of a 1.2 m (4 ft) long copper pipe surrounded by concrete.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8663781 PUBLICATION DATE: 03/09/2004 Name: FRENCH QUARTER CREEK SC NOAA Chart: 11527 Latitude: 33° 3.3' N ( 33.05500) USGS Quad: KITTREDGE Longitude: 79° 52.8' W ( -79.88000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 3781 E 1976 DESIGNATION: 866 3781 E TIDAL MONUMENTATION: Tidal Station disk VM#: 4025 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper clad steel rod OPUS PID: LATITUDE: 33° 3.3' N ( 33.05500) LONGITUDE: 79° 52.8' W ( -79.88000) The bench mark is a disk located on the north side of the entrance road, just past the manor house, 94 m (309 ft) NNE of bench mark 3781 D 1976, 20 m (67 ft) SSE of the tree line, 7.62 m (25.0 ft) SW of a 0.46 m (1.5 ft) diameter pine tree, and 4.39 m (14.4 ft) NNW of the centerline of the road. The bench mark is set level with the ground, crimped to the top of a copper-clad steel rod driven 8.8 m (29 ft) 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 4 of 5 Station ID: 8663781 PUBLICATION DATE: 03/09/2004 Name: FRENCH QUARTER CREEK SC NOAA Chart: 11527 Latitude: 33° 3.3' N ( 33.05500) USGS Quad: KITTREDGE Longitude: 79° 52.8' W ( -79.88000) T I D A L D A T U M S Tidal datums at FRENCH QUARTER CREEK based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: August 1976 - October 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 = 0.987 MEAN HIGH WATER MHW = 0.924 MEAN SEA LEVEL MSL = 0.544 MEAN TIDE LEVEL MTL = 0.499 North American Vertical Datum NAVD88 = 0.209 MEAN LOW WATER MLW = 0.075 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 3781 A 1976 1.355 0.431 3781 C 1976 2.001 1.077 3781 D 1976 2.955 2.031 3781 E 1976 4.358 3.434
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8663781 PUBLICATION DATE: 03/09/2004 Name: FRENCH QUARTER CREEK SC NOAA Chart: 11527 Latitude: 33° 3.3' N ( 33.05500) USGS Quad: KITTREDGE Longitude: 79° 52.8' W ( -79.88000) 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.