U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 PUBLICATION DATE: 11/09/1987 Station ID: 8651370 SUPERCEDED DATE: 04/21/2003 Name: DUCK, CORPS OF ENGINEERS FIELD RESEARCH FACILITY ( NORTH CAROLINA NOAA Chart: 12204 Latitude: 36° 11.0' N USGS Quad: KITTY HAWK Longitude: 75° 44.8' W To reach the tidal bench marks from the Methodist Church in Duck, proceed north on State Road 1152 for 1.0 mile (1.6 km) to the U.S. Corps of Engineers Research Facility. The bench marks are located on the pier, in the parking lot, and along the pier access road. The tide gage and electric tape gage are located on the offshore end of the pier. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 865 1370 B 1977 MONUMENTATION: Survey Disk VM#: 522 AGENCY: PID#: FW0688 SETTING CLASSIFICATION: Galvanized Steel Rod The bench mark is 222.0 feet (67.7 m) west of the NW inshore piling of the FRF pier, 200 feet (61 m) west of the centerline of the shore end of the pier, 100 feet (30 m) north of the centerline of the pier access road, and 2 feet (1 m) south of a 4x4-inch witness post. The bench mark is at ground level, crimped to a galvanized steel rod driven 24 feet (7 m) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: 865 1370 A 1977 MONUMENTATION: Survey Disk VM#: 523 AGENCY: PID#: FW0691 SETTING CLASSIFICATION: Concrete Abutment The bench mark is set vertically on the south side of the first concrete abutment of the FRF pier, 0.9 foot (0.3 m) east of the east edge of the concrete platform of the pier, 4.4 feet (1.3 m) below the edge of the platform, and 3 feet (1 m) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 PUBLICATION DATE: 11/09/1987 Station ID: 8651370 SUPERCEDED DATE: 04/21/2003 Name: DUCK, CORPS OF ENGINEERS FIELD RESEARCH FACILITY ( NORTH CAROLINA NOAA Chart: 12204 Latitude: 36° 11.0' N USGS Quad: KITTY HAWK Longitude: 75° 44.8' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 865 1370 C 1977 MONUMENTATION: Survey Disk VM#: 524 AGENCY: PID#: FW0686 SETTING CLASSIFICATION: Galvanized Steel Rod The bench mark is 600 feet (183 m) east of the centerline of State Road 1152, 100 feet (30 m) north of the centerline of the pier access road, and 2 feet (1 m) south of a 4x4-inch witness post. The bench mark is at ground level, crimped to a galvanized steel rod driven 32 feet (10 m) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: 865 1370 D 1977 MONUMENTATION: Survey Disk VM#: 525 AGENCY: PID#: FW0685 SETTING CLASSIFICATION: Galvanized Steel Rod The bench mark is 100 feet (30 m) east of the centerline of State Road 1152, 100 feet (30 m) north of the centerline of the pier access road, and 2 feet (1 m) south of a 4x4-inch witness post. The bench mark is at ground level, crimped to a galvanized steel rod driven 24 feet (7 m) 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 7 PUBLICATION DATE: 11/09/1987 Station ID: 8651370 SUPERCEDED DATE: 04/21/2003 Name: DUCK, CORPS OF ENGINEERS FIELD RESEARCH FACILITY ( NORTH CAROLINA NOAA Chart: 12204 Latitude: 36° 11.0' N USGS Quad: KITTY HAWK Longitude: 75° 44.8' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 1370 E 1979 MONUMENTATION: Survey Disk VM#: 526 AGENCY: PID#: FW0683 SETTING CLASSIFICATION: Copper-clad Steel Rod The bench mark is 72.7 feet (22.2 m) east of the centerline of State Road 1152, 66.2 feet (20.2 m) south of the centerline of the pier access road, and 46.8 feet (14.3 m) ESE of a fire hydrant at the junction of State Road 1152 and the access road. The bench mark is 0.1 foot (0.03 m) above ground level, crimped to a copper-clad steel rod driven 24 feet (7 m) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: 1370 F 1979 MONUMENTATION: Survey Disk VM#: 527 AGENCY: PID#: FW0684 SETTING CLASSIFICATION: Copper-clad Steel Rod The bench mark is located 175.0 feet (53.3 m) west of the centerline of State Road 1152, 52 feet (16 m) east of Currituck Sound shoreline, 9.8 feet (3.0 m) NW of utility pole #440, 3.2 feet (1.0 m) SW of a guy wire anchor for utility pole #440, and 1.2 feet (0.4 m) south of a 4x4-inch witness post. The bench mark is 0.4 foot (0.1 m) above ground level, crimped to a copper-clad steel rod driven 23 feet (7 m) 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 7 PUBLICATION DATE: 11/09/1987 Station ID: 8651370 SUPERCEDED DATE: 04/21/2003 Name: DUCK, CORPS OF ENGINEERS FIELD RESEARCH FACILITY ( NORTH CAROLINA NOAA Chart: 12204 Latitude: 36° 11.0' N USGS Quad: KITTY HAWK Longitude: 75° 44.8' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 1370 G 1980 MONUMENTATION: Survey Disk VM#: 528 AGENCY: PID#: FW0692 SETTING CLASSIFICATION: Concrete Deck The bench mark is set flush in the SE corner of the concrete platform leading to the FRF pier, 78.4 feet (23.9 m) east of the west face of the platform, 56.4 feet (17.2 m) south of the centerline of the platform, 25.9 feet (7.9 m) SE of the SE corner of the office building on the platform, and 1.5 feet (0.5 m) north of the south face of the platform. BENCH MARK STAMPING: 1370 H 1980 MONUMENTATION: Survey Disk VM#: 529 AGENCY: PID#: FW0689 SETTING CLASSIFICATION: Concrete Foundation The bench mark is set flush in the concrete platform leading to the FRF pier, 72.6 feet (22.1 m) north of the centerline of the platform, 35.5 feet (10.8 m) NE of the NE corner of the office building on the platform, 1.6 feet (0.5 m) west of the east face of the platform, and 1.6 feet (0.5 m) south of the north face of the platform. BENCH MARK STAMPING: 1370 J 1980 MONUMENTATION: Survey Disk VM#: 530 AGENCY: PID#: FW0687 SETTING CLASSIFICATION: Concrete Ramp The bench mark is set flush in the SE corner of a footing on the south side of an asphalt ramp leading to a platform on the north side of the FRF pier, 58.5 feet (17.8 m) north of the centerline of the pier access road, 9.0 feet (2.7 m) east of the west end of the footing, 8.7 feet (2.7 m) south of the centerline of the asphalt ramp, and 3.8 feet (1.2 m) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 PUBLICATION DATE: 11/09/1987 Station ID: 8651370 SUPERCEDED DATE: 04/21/2003 Name: DUCK, CORPS OF ENGINEERS FIELD RESEARCH FACILITY ( NORTH CAROLINA NOAA Chart: 12204 Latitude: 36° 11.0' N USGS Quad: KITTY HAWK Longitude: 75° 44.8' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 1370 K 1980 MONUMENTATION: Survey Disk VM#: 531 AGENCY: PID#: FW0690 SETTING CLASSIFICATION: Concrete Pier Decking The bench mark is set flush in the concrete decking on the south side of the FRF pier at the wind tower, 1278 feet (390 m) ESE of the inshore end of the pier, 562 feet (171 m) west of the offshore end of the pier, 16.2 feet (4.9 m) south of the north face of the pier, 2.7 feet (0.8 m) north of the south face of the pier, and 1 foot (0.3 m) north of the northernmost leg of the tower. BENCH MARK STAMPING: # 64 MONUMENTATION: Survey Disk VM#: 532 AGENCY: PID: SETTING CLASSIFICATION: Concrete Monument The bench mark is set in the top of a concrete monument west of State Road 1152 and the pier access road, south of a sand trail, 140 feet (43 m) south of a VEPCO utility pole on the south side of the sand trail, 124 feet (38 m) east of a VEPCO utility pole in Currituck Sound, and 30 feet (9 m) east of a VEPCO utility pole.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 PUBLICATION DATE: 11/09/1987 Station ID: 8651370 SUPERCEDED DATE: 04/21/2003 Name: DUCK, CORPS OF ENGINEERS FIELD RESEARCH FACILITY ( NORTH CAROLINA NOAA Chart: 12204 Latitude: 36° 11.0' N USGS Quad: KITTY HAWK Longitude: 75° 44.8' W T I D A L D A T U M S Tidal datums at DUCK, CORPS OF ENGINEERS FIELD RESEARCH FACILITY ( based on: LENGTH OF SERIES: 8 YEARS TIME PERIOD: 1979-1986 TIDAL EPOCH: 1960-1978 CONTROL TIDE STATION: 8638610 HAMPTON ROADS, VA Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET: HIGHEST OBSERVED WATER LEVEL (11/13/1981) = 6.50 MEAN HIGHER HIGH WATER MHHW = 3.75 MEAN HIGH WATER MHW = 3.43 MEAN TIDE LEVEL MTL = 1.79 * NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 1.60 MEAN LOW WATER MLW = 0.15 MEAN LOWER LOW WATER MLLW = 0.00 LOWEST OBSERVED WATER LEVEL (03/16/1980) = -2.29 * NGVD reference based on elevations published in Quad 360753, 1982, and NOS leveling of 1986. North American Vertical Datum (NAVD88) Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW 865 1370 B 1977 14.80 11.37 865 1370 A 1977 22.45 19.02 865 1370 C 1977 21.03 17.60 865 1370 D 1977 10.00 6.57 1370 E 1979 7.53 4.10 1370 F 1979 7.50 4.07 1370 G 1980 26.80 23.37 1370 H 1980 26.75 23.32 1370 J 1980 19.73 16.30 1370 K 1980 27.02 23.59 # 64 5.84 2.41
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 PUBLICATION DATE: 11/09/1987 Station ID: 8651370 SUPERCEDED DATE: 04/21/2003 Name: DUCK, CORPS OF ENGINEERS FIELD RESEARCH FACILITY ( NORTH CAROLINA NOAA Chart: 12204 Latitude: 36° 11.0' N USGS Quad: KITTY HAWK Longitude: 75° 44.8' W 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 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.