Bench Mark Sheet for 8655151, CEDAR ISLAND 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8655151                         PUBLICATION DATE:  01/21/2005
Name:       CEDAR ISLAND                                      
            NC
NOAA Chart: 11550                           Latitude:   35°  1.2' N (  35.02000)
USGS Quad:  NORTH BAY                       Longitude:  76° 18.6' W ( -76.31000)


To reach the tidal bench marks from Beaufort, proceed NE on U.S. Highway 70 and
then State Road 12 for 60 km (37 mi) to the end of the road at Cedar Island
Ferry Terminal.  The bench marks are on the ferry campground and to the SW.  The
tide gage and staff were located on the ferry slip.


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


                 PRIMARY BENCH MARK STAMPING:  5151 A 1977
                         DESIGNATION:          865 5151 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         3553
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete footing                      OPUS PID#: DM4006
LATITUDE:   35°  1.2' N (  35.02000)          LONGITUDE:  76° 18.6' W ( -76.31000)


The primary bench mark is a disk set flush in a concrete footing for an antenna,
40 m (132 ft) north of the ferry operations building.



                         BENCH MARK STAMPING:  5151 B 1977
                         DESIGNATION:          865 5151 B TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         3554
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AC7508
SETTING CLASSIFICATION:  Concrete slab                         OPUS PID:        
LATITUDE:   35°  1.0' N (  35.01670)          LONGITUDE:  76° 15.9' W ( -76.26500)


The bench mark is a disk set flush in a concrete slab in front of the ferry
operations building, 17.37 m (57.0 ft) NW of the SE corner of the ferry ticket
operations building, 1.52 m (5.0 ft) SW of the SW corner of the operations
building, 2.59 m (8.5 ft) NE of the SW corner of the sidewalk, and 0.15 m (0.5
ft) from the mens rest room partition corner.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                                                
Station ID: 8655151                         PUBLICATION DATE:  01/21/2005
Name:       CEDAR ISLAND                                      
            NC
NOAA Chart: 11550                           Latitude:   35°  1.2' N (  35.02000)
USGS Quad:  NORTH BAY                       Longitude:  76° 18.6' W ( -76.31000)


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


                         BENCH MARK STAMPING:  5151 C 1977
                         DESIGNATION:          865 5151 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         3555
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete slab                         OPUS PID:        
LATITUDE:   35°  1.2' N (  35.02000)          LONGITUDE:  76° 18.6' W ( -76.31000)


The bench mark is a disk set flush in a concrete slab at the NE corner of the
westerly motel building, and 0.24 m (0.8 ft) from the corner.



                         BENCH MARK STAMPING:  5151 D 1977
                         DESIGNATION:          865 5151 D TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         3556
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete slab                         OPUS PID:        
LATITUDE:   35°  1.2' N (  35.02000)          LONGITUDE:  76° 18.6' W ( -76.31000)


The bench mark is a disk set flush in the north end of a concrete porch slab
located on the west side of the main motel building, and 0.09 m (1.0 ft) from
the block wall.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  5

                                                                                
Station ID: 8655151                         PUBLICATION DATE:  01/21/2005
Name:       CEDAR ISLAND                                      
            NC
NOAA Chart: 11550                           Latitude:   35°  1.2' N (  35.02000)
USGS Quad:  NORTH BAY                       Longitude:  76° 18.6' W ( -76.31000)


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


                         BENCH MARK STAMPING:  5151 E 1977
                         DESIGNATION:          865 5151 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         3557
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AE5342
SETTING CLASSIFICATION:  Concrete porch                        OPUS PID:        
LATITUDE:   35°  1.0' N (  35.01670)          LONGITUDE:  76° 19.0' W ( -76.31670)


The bench mark is a disk set flush in a concrete porch at the NE corner of the
shopping complex building, 0.24 m (0.8 ft) from the NE corner of the building,
and 0.24 m (0.8 ft) SW of the edge of the porch.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  5

                                                                                
Station ID: 8655151                         PUBLICATION DATE:  01/21/2005
Name:       CEDAR ISLAND                                      
            NC
NOAA Chart: 11550                           Latitude:   35°  1.2' N (  35.02000)
USGS Quad:  NORTH BAY                       Longitude:  76° 18.6' W ( -76.31000)


                            T I D A L   D A T U M S 


Tidal datums at CEDAR ISLAND based on:

     LENGTH OF SERIES:      7 MONTHS
     TIME PERIOD:           November 1979 - May 1980
     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:

     MEAN HIGHER HIGH WATER                     MHHW   =  0.127
     MEAN HIGH WATER                            MHW    =  0.116
     MEAN TIDE LEVEL                            MTL    =  0.060
     MEAN SEA LEVEL                             MSL    =  0.036
     MEAN LOW WATER                             MLW    =  0.003
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     5151 A 1977                                 1.786    1.670
     5151 B 1977                                 1.688    1.572
     5151 C 1977                                 1.787    1.671
     5151 D 1977                                 1.774    1.658
     5151 E 1977                                 1.606    1.490


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  5

                                                                                
Station ID: 8655151                         PUBLICATION DATE:  01/21/2005
Name:       CEDAR ISLAND                                      
            NC
NOAA Chart: 11550                           Latitude:   35°  1.2' N (  35.02000)
USGS Quad:  NORTH BAY                       Longitude:  76° 18.6' W ( -76.31000)


                             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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