Superseded Bench Mark Sheet for 8658741, ZEKES ISLAND, CAPE FEAR RIVER NC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Station ID: 8658741                                SUPERCEDED DATE:   04/21/2003
Name:       ZEKES ISLAND, CAPE FEAR RIVER                     
            NORTH CAROLINA
NOAA Chart: 11537                                  Latitude:         33° 57.0' N
USGS Quad:  KURE BEACH                             Longitude:        77° 57.1' W


To reach the tidal bench marks from Federal Point ferry landing, proceed by boat
east for 0.6 statute mile (1.0 km) and then SSE for 0.9 statute mile (1.4 km) to
the break water, known as The Rocks, at the NW end of Zekes Island.  The bench
marks are located along and on the east side of the breakwater.  The tide gage
and staff were located on a range marker about 700 feet (213 m) west of the
breakwater.  To reach the tidal bench marks by foot proceed from the end of U.S.
Highway 421 at Federal Point and walk along The Rocks (breakwater) for about
0.95 mile (1.53 km) to the NW end of Zekes Island.


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


                 PRIMARY BENCH MARK STAMPING:  8741 A 1976

MONUMENTATION:           Survey Disk                               VM#:     3619
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Unspecified Steel Rod


The bench mark is located along the breakwater known as The Rocks about 0.95
mile (1.53 km) SW of Federal Point, 223 feet (68 m) south of Bench Mark THE
ROCKS 1976, and 7.5 feet (2.3 m) east of the eastern edge of the breakwater. 
The bench mark is crimped to an unspecified steel rod driven to a depth of 24
feet (7 m).



                         BENCH MARK STAMPING:  ZEKE 1932

MONUMENTATION:           Survey Disk                               VM#:     3617
AGENCY:                                                            PID#:  DD0007
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is set in the top of a concrete monument along the break water
known as The Rocks about 0.96 mile (1.54 km) SW of Federal Point, 12 feet (4 m)
east of the eastern edge of the break water, and 1 foot (0.3 m) above the
ground.

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

                                                   PUBLICATION DATE:  08/31/1988
Station ID: 8658741                                SUPERCEDED DATE:   04/21/2003
Name:       ZEKES ISLAND, CAPE FEAR RIVER                     
            NORTH CAROLINA
NOAA Chart: 11537                                  Latitude:         33° 57.0' N
USGS Quad:  KURE BEACH                             Longitude:        77° 57.1' W


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


                         BENCH MARK STAMPING:  THE ROCKS 1976

MONUMENTATION:           Survey Disk                               VM#:     3618
AGENCY:                                                            PID#:  DD1012
SETTING CLASSIFICATION:  Unspecified


The bench mark is located along the breakwater known as The Rocks about 0.95
mile (1.53 km) SW of Federal Point, at the NW point of Zekes Island.



                         BENCH MARK STAMPING:  8741 B 1976

MONUMENTATION:           Survey Disk                               VM#:     3620
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Unspecified Steel Rod


The bench mark is located along the breakwater known as The Rocks about 0.97
mile (1.56 km) SW of Federal Point, 286 feet (87 m) south of Bench Mark ZEKE
1932, and approximately 27.5 feet (8.4 m) east of the breakwater.  The bench
mark is crimped to an unspecified steel rod driven to an depth of 23 feet (7 m).



                         BENCH MARK STAMPING:  8741 C 1976

MONUMENTATION:           Survey Disk                               VM#:     3621
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Unspecified Steel Rod


The bench mark is located along the breakwater known as The Rocks about 0.98
mile (1.58 km) SW of Federal Point, 207 feet (63 m) south of Bench Mark 8741 B
1976, and 20 feet (6 m) east of the eastern edge of the breakwater.  The bench
mark is crimped to an unspecified steel rod driven to a depth of 40 feet (12 m).

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

                                                   PUBLICATION DATE:  08/31/1988
Station ID: 8658741                                SUPERCEDED DATE:   04/21/2003
Name:       ZEKES ISLAND, CAPE FEAR RIVER                     
            NORTH CAROLINA
NOAA Chart: 11537                                  Latitude:         33° 57.0' N
USGS Quad:  KURE BEACH                             Longitude:        77° 57.1' W


                            T I D A L   D A T U M S 


Tidal datums at ZEKES ISLAND, CAPE FEAR RIVER 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 (06/12/1976)         =   5.54
     MEAN HIGHER HIGH WATER                     MHHW   =   4.41
     MEAN HIGH WATER                            MHW    =   4.10
     MEAN TIDE LEVEL                            MTL    =   2.13
     MEAN LOW WATER                             MLW    =   0.17
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (03/17/1976)         =  -1.30

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     8741 A 1976                                 6.17      2.07
     ZEKE 1932                                   6.38      2.28
     THE ROCKS 1976                              5.71      1.61
     8741 B 1976                                 6.56      2.46
     8741 C 1976                                 5.93      1.83


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

                                                   PUBLICATION DATE:  08/31/1988
Station ID: 8658741                                SUPERCEDED DATE:   04/21/2003
Name:       ZEKES ISLAND, CAPE FEAR RIVER                     
            NORTH CAROLINA
NOAA Chart: 11537                                  Latitude:         33° 57.0' N
USGS Quad:  KURE BEACH                             Longitude:        77° 57.1' 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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