U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 8658622 PUBLICATION DATE: 06/16/2004 Name: REAVES POINT, MOTSU CENTER NC NOAA Chart: 11537 Latitude: 34° 0.2' N ( 34.00330) USGS Quad: CAROLINA BEACH Longitude: 77° 57.3' W ( -77.95500) To reach the tidal bench marks from the post office in Southport, proceed west one block, then turn right and proceed north on Howe Street for 2.4 km (1.5 mi), then turn right and proceed north on State Road 87 for 5.0 km (3.1 mi), then turn right onto Brunswick Road to the entrance of Military Ocean Terminal, Sunny Point and proceed 5.3 km (3.3 mi) past the main gate, then turn right onto Sunny Point Road and continue for 0.8 km (0.5 mi), then turn left on Center Wharf Road. The tide gage and staff were located on a dock south of Center Wharf (Wharf No. 2) and the railroad tracks. The bench marks are along the railroad tracks and Center Wharf Road. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 1 1974 DESIGNATION: 865 8622 TIDAL 1 MONUMENTATION: Tidal Station disk VM#: 3602 AGENCY: National Ocean Survey (NOS) IDB PID#: EA1273 SETTING CLASSIFICATION: Concrete sidewalk OPUS PID: LATITUDE: 34° 0.2' N ( 34.00330) LONGITUDE: 77° 57.3' W ( -77.95500) The primary bench mark is a disk set flush in the concrete sidewalk north of the south end of Wharf No. 2, 7 m (24 ft) north of the centerline of the railroad tracks, and 5.12 m (16.8 ft) south of the cinder block fire house.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 8658622 PUBLICATION DATE: 06/16/2004 Name: REAVES POINT, MOTSU CENTER NC NOAA Chart: 11537 Latitude: 34° 0.2' N ( 34.00330) USGS Quad: CAROLINA BEACH Longitude: 77° 57.3' W ( -77.95500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 2 1974 DESIGNATION: 865 8622 TIDAL 2 MONUMENTATION: Tidal Station disk VM#: 3603 AGENCY: National Ocean Survey (NOS) IDB PID#: EA1272 SETTING CLASSIFICATION: Concrete sidewalk OPUS PID#: EA1272 LATITUDE: 34° 0.2' N ( 34.00330) LONGITUDE: 77° 57.4' W ( -77.95670) The bench mark is a disk set flush in the concrete sidewalk at the south end of the west side of Wharf No. 2, 8.29 m (27.2 ft) ENE of guar house S-234, and 6.95 m (22.8 ft) north of the centerline of the railroad tracks. BENCH MARK STAMPING: NO 3 1974 DESIGNATION: 865 8622 TIDAL 3 MONUMENTATION: Tidal Station disk VM#: 3604 AGENCY: National Ocean Survey (NOS) IDB PID#: EA1271 SETTING CLASSIFICATION: Concrete abutment OPUS PID: LATITUDE: 34° 0.2' N ( 34.00330) LONGITUDE: 77° 57.4' W ( -77.95670) The bench mark is a disk set flush in a concrete abutment at the south end of Wharf No. 2, 14.14 m (46.4 ft) ESE of the SE corner of guard house S-234 and 2.13 m (7.0 ft) SE of the SE rail of the railroad.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 8658622 PUBLICATION DATE: 06/16/2004 Name: REAVES POINT, MOTSU CENTER NC NOAA Chart: 11537 Latitude: 34° 0.2' N ( 34.00330) USGS Quad: CAROLINA BEACH Longitude: 77° 57.3' W ( -77.95500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 4 1974 DESIGNATION: 865 8622 TIDAL 4 MONUMENTATION: Tidal Station disk VM#: 3605 AGENCY: National Ocean Survey (NOS) IDB PID#: EA1270 SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 34° 0.2' N ( 34.00330) LONGITUDE: 77° 57.5' W ( -77.95830) The bench mark is a disk set flush in a concrete foundation at the SW corner of a tin building, 26.37 m (86.5 ft) east of the third power pole on Center Wharf Road, and 9.20 m (30.2 ft) north of the centerline of Center Wharf Road, and 0.30 m (1.0 ft) south of the south edge of the building. BENCH MARK STAMPING: NO 5 1974 DESIGNATION: 865 8622 TIDAL 5 MONUMENTATION: Tidal Station disk VM#: 3606 AGENCY: National Ocean Survey (NOS) IDB PID#: EA1269 SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 34° 0.2' N ( 34.00330) LONGITUDE: 77° 57.5' W ( -77.95830) The bench mark is a disk set flush in a concrete foundation at the SW corner of a green block building, 23 m (75 ft) north of the centerline of Center Wharf Road, 18 m (58 ft) east of a second pole on Center Wharf Road and 0.30 m (1.0 ft) SSE of the SW corner of the building.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 8658622 PUBLICATION DATE: 06/16/2004 Name: REAVES POINT, MOTSU CENTER NC NOAA Chart: 11537 Latitude: 34° 0.2' N ( 34.00330) USGS Quad: CAROLINA BEACH Longitude: 77° 57.3' W ( -77.95500) T I D A L D A T U M S Tidal datums at REAVES POINT, MOTSU CENTER based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: April 1976 - June 1976 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8658120 WILMINGTON, CAPE FEAR RIVER Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.393 MEAN HIGH WATER MHW = 1.296 North American Vertical Datum NAVD88 = 0.960 MEAN SEA LEVEL MSL = 0.685 MEAN TIDE LEVEL MTL = 0.672 MEAN LOW WATER MLW = 0.048 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW NO 1 1974 4.014 2.718 NO 2 1974 4.311 3.015 NO 3 1974 4.059 2.763 NO 4 1974 4.844 3.548 NO 5 1974 5.488 4.192
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 8658622 PUBLICATION DATE: 06/16/2004 Name: REAVES POINT, MOTSU CENTER NC NOAA Chart: 11537 Latitude: 34° 0.2' N ( 34.00330) USGS Quad: CAROLINA BEACH Longitude: 77° 57.3' W ( -77.95500) 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.