U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8668092 PUBLICATION DATE: 02/05/2004 Name: BATTERY CREEK SC NOAA Chart: 11516 Latitude: 32° 24.8' N ( 32.41330) USGS Quad: BEAUFORT Longitude: 80° 42.0' W ( -80.70000) To reach the tidal bench marks from the intersection of U.S. Highway 21 and State Highway 281 in Beaufort, proceed south on State Highway 281 for 2.9 km (1.8 mi) to County Road S-7-159, then west on County Road S-7-159 for 0.72 km (0.45 mi) to a sand drive, then west on the sand drive for 0.8 km (0.5 mi) to a large, brick, L-shaped house. The bench marks are along the drive leading to the house and dock. The tide gage and staff were located on the dock NE of the house. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 8092 A 1978 DESIGNATION: 866 8092 A TIDAL MONUMENTATION: Tidal Station disk VM#: 4451 AGENCY: National Ocean Survey (NOS) IDB PID#: CK2228 SETTING CLASSIFICATION: Galvanized steel rod OPUS PID: LATITUDE: 32° 24.8' N ( 32.41330) LONGITUDE: 80° 42.0' W ( -80.70000) The primary bench mark is a disk located on the north side of the trail that leads to the dock, 14.63 m (48.0 ft) NW of a 0.21 m (0.7 ft) diameter twin oak tree, 11.19 m (36.7 ft) WSW of a lone 0.3 m (1 ft) diameter palmetto tree, 5.18 m (17.0 ft) ESE of the dock, and 1.83 m (6.0 ft) NE of the centerline of the trail leading to the dock. The bench mark is set at ground level, crimped to the top of a galvanized steel rod driven 11.6 m (38 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: 8668092 PUBLICATION DATE: 02/05/2004 Name: BATTERY CREEK SC NOAA Chart: 11516 Latitude: 32° 24.8' N ( 32.41330) USGS Quad: BEAUFORT Longitude: 80° 42.0' W ( -80.70000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8092 B 1978 DESIGNATION: 866 8092 B TIDAL MONUMENTATION: Tidal Station disk VM#: 4452 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 32° 24.8' N ( 32.41330) LONGITUDE: 80° 42.0' W ( -80.70000) The bench mark is a disk set in a concrete monument located on the dirt path leading from the main house to the private dock, 29.26 m (96.0 ft) SW of bench mark 8092 A 1978, 14 m (46 ft) SSW of a 0.21 m (0.7 ft) diameter twin oak tree, 5.18 m (17.0 ft) SE of a 0.46 m (1.5 ft) diameter live oak tree, 1.83 m (6.0 ft) west of the centerline of the dirt path leading to the dock, and at ground level. BENCH MARK STAMPING: 8092 C 1978 DESIGNATION: 866 8092 C TIDAL MONUMENTATION: Tidal Station disk VM#: 4453 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Galvanized steel rod OPUS PID: LATITUDE: 32° 24.8' N ( 32.41330) LONGITUDE: 80° 42.0' W ( -80.70000) The bench mark is a disk located on the path leading from the main house to the dock, 39.32 m (129.0 ft) SE of bench mark 8092 B 1978, 4.39 m (14.4 ft) north of a 0.21 m (0.7 ft) diameter oak tree, 3.23 m (10.6 ft) ENE of the centerline of the dirt path leading to the dock, and 1.83 m (6.0 ft) SSW of a 0.15 m (0.5 ft) diameter pine tree. The bench mark is set 9 cm (0.3 ft) above ground level, crimped to the top of a galvanized steel rod driven 11.6 m (38 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 3 of 5 Station ID: 8668092 PUBLICATION DATE: 02/05/2004 Name: BATTERY CREEK SC NOAA Chart: 11516 Latitude: 32° 24.8' N ( 32.41330) USGS Quad: BEAUFORT Longitude: 80° 42.0' W ( -80.70000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8092 D 1978 DESIGNATION: 866 8092 D TIDAL MONUMENTATION: Tidal Station disk VM#: 4454 AGENCY: National Ocean Survey (NOS) IDB PID#: CK2227 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 32° 24.8' N ( 32.41330) LONGITUDE: 80° 42.0' W ( -80.70000) The bench mark is a disk set in a concrete monument located on the right side of the drive in the front of the house near a clump of cedar trees, 36.24 m (118.9 ft) NE of the corner of the house, 20.42 m (67.0 ft) NNW of a 0.61 m (2.0 ft) diameter pine tree with a yard light, and 18.47 m (60.6 ft) NNE of the NE brick pillar at the north edge of the parking area. BENCH MARK STAMPING: 8092 E 1978 DESIGNATION: 866 8092 E TIDAL MONUMENTATION: Tidal Station disk VM#: 4455 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Galvanized steel rod OPUS PID: LATITUDE: 32° 24.8' N ( 32.41330) LONGITUDE: 80° 42.0' W ( -80.70000) The bench mark is a disk located near the main house and a small duck pond, 88.39 m (290.0 ft) NE of bench mark 8092 D 1978, 29.57 m (97.0 ft) SW of the edge of the duck pond, 9.75 m (32.0 ft) west of the centerline of the drive, 9.57 m (31.4 ft) SE of a 0.61 m (2.0 ft) diameter triple oak tree, and 2.13 m (7.0 ft) NE of the edge of the woods. The bench mark is set at ground level, crimped to the top of a galvanized steel rod driven 11.6 m (38 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: 8668092 PUBLICATION DATE: 02/05/2004 Name: BATTERY CREEK SC NOAA Chart: 11516 Latitude: 32° 24.8' N ( 32.41330) USGS Quad: BEAUFORT Longitude: 80° 42.0' W ( -80.70000) T I D A L D A T U M S Tidal datums at BATTERY CREEK based on: LENGTH OF SERIES: 1 YEAR TIME PERIOD: March 1978 - February 1979 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8667999 BEAUFORT Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (06/12/1979) = 3.015 MEAN HIGHER HIGH WATER MHHW = 2.511 MEAN HIGH WATER MHW = 2.390 North American Vertical Datum NAVD88 = 1.361 MEAN SEA LEVEL MSL = 1.330 MEAN TIDE LEVEL MTL = 1.226 MEAN LOW WATER MLW = 0.061 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (03/10/1978) = -0.575 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 8092 A 1978 3.847 1.457 8092 B 1978 3.163 0.773 8092 C 1978 4.835 2.445 8092 D 1978 6.090 3.700 8092 E 1978 5.287 2.897
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8668092 PUBLICATION DATE: 02/05/2004 Name: BATTERY CREEK SC NOAA Chart: 11516 Latitude: 32° 24.8' N ( 32.41330) USGS Quad: BEAUFORT Longitude: 80° 42.0' W ( -80.70000) 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.