Bench Mark Sheet for 8658622, REAVES POINT, MOTSU CENTER NC

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

                          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.

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