U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8656590 PUBLICATION DATE: 08/03/2004 Name: ATLANTIC BEACH TRIPLE S PIER NC NOAA Chart: 11547 Latitude: 34° 41.6' N ( 34.69330) USGS Quad: BEAUFORT Longitude: 76° 42.7' W ( -76.71170) To reach the tidal bench marks from the Atlantic Beach Post Office, proceed south on Morehead Avenue for 0.5 km (0.3 mi) to Fort Macon Boulevard, then turn left and proceed east on Fort Macon Boulevard for 2.6 km (1.6 mi) to Henderson Boulevard, then turn right and proceed south on Henderson Boulevard for 0.3 km (0.2 mi) to Triple S Fishing Pier. The bench marks are near the pier and along Henderson Boulevard. The tide gage was located near the outer end of the pier. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 6590 B 1976 DESIGNATION: 865 6590 TIDAL B MONUMENTATION: Tidal Station disk VM#: 3564 AGENCY: National Ocean Survey (NOS) IDB PID#: AC7539 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 34° 41.8' N ( 34.69670) LONGITUDE: 76° 42.7' W ( -76.71170) The primary bench mark is a disk located at the SW corner of Henderson Boulevard and Cooper Avenue, 10.36 m (34.0 ft) west of the centerline of Henderson Boulevard, 8 m (26 ft) south of the centerline of Cooper Avenue, 3.77 m (12.4 ft) east of the NE corner of the Sand and Sea Motel, and 0.43 m (1.4 ft) north of a wooden street marker. The bench mark is crimped to the top of a copper-clad steel rod driven an unspecified depth, and surrounded by 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: 8656590 PUBLICATION DATE: 08/03/2004 Name: ATLANTIC BEACH TRIPLE S PIER NC NOAA Chart: 11547 Latitude: 34° 41.6' N ( 34.69330) USGS Quad: BEAUFORT Longitude: 76° 42.7' W ( -76.71170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 4 1960 DESIGNATION: 865 6590 TIDAL 4 MONUMENTATION: Bench Mark disk VM#: 3561 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: EA0180 SETTING CLASSIFICATION: Concrete apron OPUS PID: LATITUDE: 34° 41.7' N ( 34.69500) LONGITUDE: 76° 42.7' W ( -76.71170) The bench mark is a disk set in the concrete apron surrounding the Triple S Pier snack bar building, 10.21 m (33.5 ft) west of the extended centerline of Henderson Boulevard, 9.45 m (31.0 ft) east of the NW corner of the attached garage, and 0.12 m (0.4 ft) north of the building. BENCH MARK STAMPING: NO 6 1960 DESIGNATION: 865 6590 TIDAL 6 MONUMENTATION: Bench Mark disk VM#: 3563 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: EA0177 SETTING CLASSIFICATION: Apartment building OPUS PID: LATITUDE: 34° 41.9' N ( 34.69830) LONGITUDE: 76° 42.7' W ( -76.71170) The bench mark is a disk set in a concrete slab beneath the Old Salt II Motel, a second story overhang on the east side of Henderson Boulevard, 0.24 km (0.15 mi) north of Triple S Pier, 34 m (113 ft) south of the centerline of Winston Avenue, and 14 m (46 ft) east of the centerline of Henderson Boulevard.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8656590 PUBLICATION DATE: 08/03/2004 Name: ATLANTIC BEACH TRIPLE S PIER NC NOAA Chart: 11547 Latitude: 34° 41.6' N ( 34.69330) USGS Quad: BEAUFORT Longitude: 76° 42.7' W ( -76.71170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6590 C 1976 DESIGNATION: 865 6590 TIDAL C MONUMENTATION: Tidal Station disk VM#: 3565 AGENCY: National Ocean Survey (NOS) IDB PID#: AC7488 SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID#: AC7488 LATITUDE: 34° 41.9' N ( 34.69830) LONGITUDE: 76° 42.7' W ( -76.71170) The bench mark is a disk located on the west side of Henderson Boulevard at the corner of Barefoot Lane, 9.91 m (32.5 ft) west of the centerline of Henderson Boulevard, 7.44 m (24.4 ft) south of Barefoot Lane, 1.15 m (3.8 ft) NNE of a fire hydrant, and 1.3 feet (0.4 m) east of a wooden street marker. The bench mark is crimped to a copper-clad steel rod driven 13.7 m (45 ft), and surrounded by a 4-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: NO 8 1972 DESIGNATION: 865 6590 NO 8 MONUMENTATION: Tidal Station disk VM#: 14002 AGENCY: National Ocean Service (NOS) IDB PID#: AC7541 SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 34° 41.9' N ( 34.69830) LONGITUDE: 76° 42.7' W ( -76.71170) The bench mark is a disk set flush in the SE corner of the concrete foundation of the concrete block bathhouse of the Triple S Marina camp ground, 37.77 m (123.9 ft) north of the centerline of Fort Macon Boulevard, 9.46 m (31.0 ft) east of the SW corner of the bathhouse, and 0.62 m (2.0 ft) SE of the SE corner of the building.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8656590 PUBLICATION DATE: 08/03/2004 Name: ATLANTIC BEACH TRIPLE S PIER NC NOAA Chart: 11547 Latitude: 34° 41.6' N ( 34.69330) USGS Quad: BEAUFORT Longitude: 76° 42.7' W ( -76.71170) T I D A L D A T U M S Tidal datums at ATLANTIC BEACH TRIPLE S PIER based on: LENGTH OF SERIES: 1 YEAR TIME PERIOD: June 1999 - May 2000 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8656483 BEAUFORT, DUKE MARINE LAB Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (11/13/1981) = 1.982 MEAN HIGHER HIGH WATER MHHW = 1.264 MEAN HIGH WATER MHW = 1.160 North American Vertical Datum NAVD88 = 0.757 MEAN SEA LEVEL MSL = 0.610 MEAN TIDE LEVEL MTL = 0.604 MEAN LOW WATER MLW = 0.047 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (01/14/1982) = -0.746 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 6590 B 1976 3.573 2.413 NO 4 1960 4.057 2.897 NO 6 1960 4.686 3.526 6590 C 1976 4.008 2.848 NO 8 1972 2.137 0.977
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8656590 PUBLICATION DATE: 08/03/2004 Name: ATLANTIC BEACH TRIPLE S PIER NC NOAA Chart: 11547 Latitude: 34° 41.6' N ( 34.69330) USGS Quad: BEAUFORT Longitude: 76° 42.7' W ( -76.71170) 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.