U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8668155 PUBLICATION DATE: 02/05/2004 Name: DISTANT ISLAND CREEK, UPPER END SC NOAA Chart: 11516 Latitude: 32° 24.1' N ( 32.40170) USGS Quad: BEAUFORT Longitude: 80° 39.2' W ( -80.65330) To reach the tidal bench marks from the intersection of U.S. Highway 21 and Bay Street in Beaufort, proceed south on U.S. Highway 21 for 1.4 km (0.9 mi) to Meridian Road (S-7-36), turn right on Meridian Road and go south for 1.21 km (0.75 mi) to Rue Dubois (a winding dirt road), turn left on Rue Dubois and go 0.89 km (0.55 mi) to another dirt road, turn right on the dirt road and go 0.40 km (0.25 mi) to a fork in the road, take the right fork for 0.40 km (0.25 mi) to its end. The bench marks are located along a narrow dirt road leading to a 23 m (75 ft) long pier on Distant Island Creek. The tide gage and staff were located at the end of the pier. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 8155 A 1979 DESIGNATION: 866 8155 A TIDAL MONUMENTATION: Tidal Station disk VM#: 4464 AGENCY: National Ocean Survey (NOS) IDB PID#: CK2281 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 32° 24.1' N ( 32.40170) LONGITUDE: 80° 39.2' W ( -80.65330) The primary bench mark is a disk located near the foot of the pier close to the high water line, 12.10 m (39.7 ft) NNE of the center of a boat landing, 10.70 m (35.1 ft) NNW of the foot of the pier, and 4.88 m (16.0 ft) SW of the marsh line. The bench mark is set at ground level, crimped to the top of a stainless steel rod driven 7.3 m (24 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: 8668155 PUBLICATION DATE: 02/05/2004 Name: DISTANT ISLAND CREEK, UPPER END SC NOAA Chart: 11516 Latitude: 32° 24.1' N ( 32.40170) USGS Quad: BEAUFORT Longitude: 80° 39.2' W ( -80.65330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8155 B 1979 DESIGNATION: 866 8155 B TIDAL MONUMENTATION: Tidal Station disk VM#: 4465 AGENCY: National Ocean Survey (NOS) IDB PID#: CK2282 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 32° 24.2' N ( 32.40330) LONGITUDE: 80° 39.3' W ( -80.65500) The bench mark is a disk located near the edge of the swamp at the end of the road where the power lines cross, 58.22 m (191.0 ft) SE of bench mark 8155 F 1981, 20.09 m (65.9 ft) south of the pine tree line, 14.33 m (47.0 ft) east of the center- line of the road leading to the pier, 12.71 m (41.7 ft) north of utility pole #155796 (north face of pole), and 0.67 m (2.2 ft) ESE of a steel witness post. The bench mark is set at ground level, crimped to the top of a stainless steel rod driven 8.2 m (27 ft) to refusal, and encased in a PVC pipe and concrete kickblock. BENCH MARK STAMPING: 8155 D 1979 DESIGNATION: 866 8155 D TIDAL MONUMENTATION: Tidal Station disk VM#: 4466 AGENCY: National Ocean Survey (NOS) IDB PID#: CK2280 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 32° 24.2' N ( 32.40330) LONGITUDE: 80° 39.3' W ( -80.65500) The bench mark is a disk located on the south side of the dirt road near a 0.18 m (0.6 ft) blazed pine tree, 78 m (256 ft) SSW of bench mark 8155 G 1981, 3.84 m (12.6 ft) WSW of the centerline of the dirt road leading to the pier, 2.74 m (9.0 ft) NNW of a 0.18 m (0.6 ft) diameter pine tree, and 0.55 m (1.8 ft) SW of a steel witness post. The bench mark is set 9 cm (0.3 ft) above ground level, crimped to the top of a stainless steel rod driven 7.3 m (24 ft) to refusal, and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8668155 PUBLICATION DATE: 02/05/2004 Name: DISTANT ISLAND CREEK, UPPER END SC NOAA Chart: 11516 Latitude: 32° 24.1' N ( 32.40170) USGS Quad: BEAUFORT Longitude: 80° 39.2' W ( -80.65330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8155 F 1981 DESIGNATION: 866 8155 F TIDAL MONUMENTATION: Tidal Station disk VM#: 4467 AGENCY: National Ocean Survey (NOS) IDB PID#: CK2283 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 32° 24.2' N ( 32.40330) LONGITUDE: 80° 39.3' W ( -80.65500) The bench mark is a disk set in a concrete monument located on the south side of the road near a 0.61 m (2 ft) diameter oak tree, 68.73 m (225.5 ft) south of bench mark 8155 D 1979, 5.91 m (19.4 ft) SW of the centerline of the dirt road leading to the pier, 4.42 m (14.5 ft) south a 0.61 m (2.0 ft) diameter oak tree, 1.16 m (3.8 ft) ENE of a witness post with sign, 1.07 m (3.5 ft) SSE of a 0.18 m (0.6 ft) diameter pine tree. BENCH MARK STAMPING: 8155 G 1981 DESIGNATION: 866 8155 G TIDAL MONUMENTATION: Tidal Station disk VM#: 4468 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 32° 24.1' N ( 32.40170) LONGITUDE: 80° 39.2' W ( -80.65330) The bench mark is a disk set in concrete located on the east side of the dirt road, 8.08 m (26.5 ft) NE of the centerline of the road leading to the pier, 6.68 m (21.9 ft) WSW of the center of a triple trunk oak tree, 1.71 m (5.6 ft) NE of a witness post with sign, and 1.58 m (5.2 ft)) east of a 0.3 m (1 ft) diameter pine tree.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8668155 PUBLICATION DATE: 02/05/2004 Name: DISTANT ISLAND CREEK, UPPER END SC NOAA Chart: 11516 Latitude: 32° 24.1' N ( 32.40170) USGS Quad: BEAUFORT Longitude: 80° 39.2' W ( -80.65330) T I D A L D A T U M S Tidal datums at DISTANT ISLAND CREEK, UPPER END based on: LENGTH OF SERIES: 1 YEAR TIME PERIOD: March 1980 - February 1981 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 (05/16/1980) = 2.812 MEAN HIGHER HIGH WATER MHHW = 2.249 MEAN HIGH WATER MHW = 2.133 North American Vertical Datum NAVD88 = 1.132 MEAN SEA LEVEL MSL = 1.127 MEAN TIDE LEVEL MTL = 1.079 MEAN LOW WATER MLW = 0.025 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (03/21/1980) = -0.257 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 8155 A 1979 2.648 0.515 8155 B 1979 2.529 0.396 8155 D 1979 3.197 1.064 8155 F 1981 2.888 0.755 8155 G 1981 2.866 0.733
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8668155 PUBLICATION DATE: 02/05/2004 Name: DISTANT ISLAND CREEK, UPPER END SC NOAA Chart: 11516 Latitude: 32° 24.1' N ( 32.40170) USGS Quad: BEAUFORT Longitude: 80° 39.2' W ( -80.65330) 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.