Superseded Bench Mark Sheet for 8658622, REAVES POINT, MOTSU CENTER NC

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  4

                                                   PUBLICATION DATE:  08/31/1988
Station ID: 8658622                                SUPERCEDED DATE:   04/21/2003
Name:       CENTER WHARF, MILITARY OCEAN TERMINAL, SUNNY POINT
            NORTH CAROLINA
NOAA Chart: 11537                                  Latitude:         34°  0.2' N
USGS Quad:  CAROLINA BEACH                         Longitude:        77° 57.3' W


To reach the tidal bench marks from the post office in Southport, proceed west
one block, turn right and north onto Howe Street for 1.5 miles (2.4 km) right
and north onto State Road 87 for 3.1 miles (5.0 km), right onto Brunswick Road
to the entrance of Military Ocean Terminal, Sunny Point, proceed 3.3 miles (5.3
km) past the main gate, right onto Sunny Point Road for 0.5 mile (0.8 km) left
at 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

MONUMENTATION:           Survey Disk                               VM#:     3602
AGENCY:                                                            PID#:  EA1273
SETTING CLASSIFICATION:  Concrete Wharf


The bench mark is set flush in a concrete wharf north of the south end of Wharf
No. 2, 24 feet (7 m) north of the centerline of the railroad tracks, and 16.8
feet (5.1 m) south of the cinder block fire house.



                         BENCH MARK STAMPING:  NO 2 1974

MONUMENTATION:           Survey Disk                               VM#:     3603
AGENCY:                                                            PID#:  EA1272
SETTING CLASSIFICATION:  Concrete Wharf


The bench mark is set flush in concrete at the south end of the west side of
Wharf No. 2, and 22.8 feet (6.9 m) north of the centerline of the railroad
tracks.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  4

                                                   PUBLICATION DATE:  08/31/1988
Station ID: 8658622                                SUPERCEDED DATE:   04/21/2003
Name:       CENTER WHARF, MILITARY OCEAN TERMINAL, SUNNY POINT
            NORTH CAROLINA
NOAA Chart: 11537                                  Latitude:         34°  0.2' N
USGS Quad:  CAROLINA BEACH                         Longitude:        77° 57.3' W


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  NO 3 1974

MONUMENTATION:           Survey Disk                               VM#:     3604
AGENCY:                                                            PID#:  EA1271
SETTING CLASSIFICATION:  Concrete Abutment


The bench mark is set flush in a concrete abutment at the south end of Wharf No.
2.



                         BENCH MARK STAMPING:  NO 4 1974

MONUMENTATION:           Survey Disk                               VM#:     3605
AGENCY:                                                            PID#:  EA1270
SETTING CLASSIFICATION:  Concrete Foundation


The bench mark is set flush in a concrete foundation at the SW corner of a tin
building, 86.5 feet (26.4 m) east of the third power pole on Center Wharf Road,
and 30.2 feet (9.2 m) north of the centerline of Center Wharf Road.



                         BENCH MARK STAMPING:  NO 5 1974

MONUMENTATION:           Survey Disk                               VM#:     3606
AGENCY:                                                            PID#:  EA1269
SETTING CLASSIFICATION:  Concrete Foundation


The bench mark is set flush in a concrete foundation at the SW corner of a green
block building, 75 feet (23 m) north of the centerline of Center Wharf Road, and
58 feet (18 m) east of a second pole on Center Wharf Road.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  4

                                                   PUBLICATION DATE:  08/31/1988
Station ID: 8658622                                SUPERCEDED DATE:   04/21/2003
Name:       CENTER WHARF, MILITARY OCEAN TERMINAL, SUNNY POINT
            NORTH CAROLINA
NOAA Chart: 11537                                  Latitude:         34°  0.2' N
USGS Quad:  CAROLINA BEACH                         Longitude:        77° 57.3' W


                            T I D A L   D A T U M S 


Tidal datums at CENTER WHARF, MILITARY OCEAN TERMINAL, SUNNY POINT based on:

     LENGTH OF SERIES:      3 MONTHS
     TIME PERIOD:           APRIL - JUNE 1976
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8658120 WILMINGTON


Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:

     HIGHEST OBSERVED WATER LEVEL (11/12/1974)         =   6.64
     MEAN HIGHER HIGH WATER                     MHHW   =   4.41
     MEAN HIGH WATER                            MHW    =   4.11
     MEAN TIDE LEVEL                            MTL    =   2.14
     MEAN LOW WATER                             MLW    =   0.17
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (04/16/1976)         =  -1.20

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     NO 1 1974                                  13.25      9.14
     NO 2 1974                                  14.22     10.11
     NO 3 1974                                  13.40      9.29
     NO 4 1974                                  15.97     11.86
     NO 5 1974                                  18.09     13.98


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  4

                                                   PUBLICATION DATE:  08/31/1988
Station ID: 8658622                                SUPERCEDED DATE:   04/21/2003
Name:       CENTER WHARF, MILITARY OCEAN TERMINAL, SUNNY POINT
            NORTH CAROLINA
NOAA Chart: 11537                                  Latitude:         34°  0.2' N
USGS Quad:  CAROLINA BEACH                         Longitude:        77° 57.3' 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.

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