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Bench Mark Sheet for 8651817, Edenhouse Point 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  7

                                                                                
Station ID: 8651817                         PUBLICATION DATE:  12/04/2012
Name:       EDENHOUSE POINT                                   
            NC
NOAA Chart: 12205                           Latitude:   36°  3.3' N (  36.05503)
USGS Quad:  EDENOUSE                        Longitude:  76° 41.1' W ( -76.68425)


To reach the tidal bench marks from the north end of the US Highway 17 bridge
crossing the Chowan River, proceed NE on Highway 17 for 1.0 km (0.6 mi) to exit
224, exit right and proceed east 0.6 km (0.4 mi) to an intersection with Queen
Street, turn left and proceed NW on Queen Street for 0.5 km (0.3 mi) to Wildlife
Access Road, turn left and proceed SW on Wildlife Access Road for 0.6 km (1.0
mi) to its termination and a parking lot for a public boat launch.  The bench
marks are in the vicinity of the parking lot and along Wildlife Access Road. 
The tide gauge is located on the dock at the public boat launch at the NW corner
of the parking lot.


                         T I D A L   B E N C H   M A R K S
                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  7

                                                                                
Station ID: 8651817                         PUBLICATION DATE:  12/04/2012
Name:       EDENHOUSE POINT                                   
            NC
NOAA Chart: 12205                           Latitude:   36°  3.3' N (  36.05503)
USGS Quad:  EDENOUSE                        Longitude:  76° 41.1' W ( -76.68425)


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


                 PRIMARY BENCH MARK STAMPING:  P 211 1979
                         DESIGNATION:          P 211

MONUMENTATION:           Flange-encased Rod                    VM#:        20456
AGENCY:                  NGS                                   IDB PID#:  FX2425
SETTING CLASSIFICATION:                                        OPUS PID:        
LATITUDE:   36°  3.3' N (  36.05431)          LONGITUDE:  76° 41.0' W ( -76.68281)


The primary bench mark is a flange-encased rod set 4-inches below a standard
National Geodetic Survey logo access cover, 21.7 m (71.3 ft) east of centerline
of drive to boating access area, 13 m (42.9 ft) southwest of a power pole with
reference tag, 12.6 m (41.4 ft) north of centerline of highway and .45 m (1.5
ft) north of the  North Post For Wildlife  sign. The datum point is a steel knob
on top of a rod flange.



                         BENCH MARK STAMPING:  1817 A 2012
                         DESIGNATION:          865 1817 A

MONUMENTATION:           Survey disk                           VM#:        20453
AGENCY:                  NOS                                   IDB PID#:        
SETTING CLASSIFICATION:  Concrete walk                         OPUS PID:        
LATITUDE:   36°  3.3' N (  36.05494)          LONGITUDE:  76° 41.0' W ( -76.68411)


The bench mark is set in a concrete walk in the center of the boat ramp, 12.38 m
(40.6 ft) north-northwest of a light post, 8.65 m (28.4 ft) west-northwest of
the east end of the concrete walkway and the edge of the asphalt parking lot,
8.45 m (27.7 ft) south of the eastern end of the sheet piling along the north
edge of the boat ramp, 1.63 m (5.3 ft) west-northwest of southern metal post on
the concrete walkway and 0.40 m (1.3 ft) east-southeast of the west end of the
concrete walk and the beginning of the floating dock.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  7

                                                                                
Station ID: 8651817                         PUBLICATION DATE:  12/04/2012
Name:       EDENHOUSE POINT                                   
            NC
NOAA Chart: 12205                           Latitude:   36°  3.3' N (  36.05503)
USGS Quad:  EDENOUSE                        Longitude:  76° 41.1' W ( -76.68425)


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


                         BENCH MARK STAMPING:  1817 B 2012
                         DESIGNATION:          865 1817 B

MONUMENTATION:           Survey disk                           VM#:        20454
AGENCY:                  NOS                                   IDB PID#:        
SETTING CLASSIFICATION:  Road embankment                       OPUS PID:        
LATITUDE:   36°  3.2' N (  36.05386)          LONGITUDE:  76° 41.0' W ( -76.68258)


The bench mark is set in a concrete road embankment, 36.92 m (121.1 ft)
southeast of of the centerline of wildlife access road, 19.18 m (62.9 ft)
southeast of the north end of the concrete embankment, 16.20 m (53.1 ft)
southwest of the southeast most piling along the northeast side of the road
under the Highway 17 overpass, 7.30 m (24.0 ft) southwest of the centerline of
the road under the Highway 17 overpass and 1.93 m (6.3 ft) northwest of the
south end of the concrete embankment.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  7

                                                                                
Station ID: 8651817                         PUBLICATION DATE:  12/04/2012
Name:       EDENHOUSE POINT                                   
            NC
NOAA Chart: 12205                           Latitude:   36°  3.3' N (  36.05503)
USGS Quad:  EDENOUSE                        Longitude:  76° 41.1' W ( -76.68425)


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


                         BENCH MARK STAMPING:  TOUR 1980
                         DESIGNATION:          TOUR

MONUMENTATION:           Survey disk                           VM#:        20455
AGENCY:                  North Carolina Geodetic Survey        IDB PID#:  FX2907
SETTING CLASSIFICATION:                                        OPUS PID:        
LATITUDE:   36°  3.5' N (  36.05781)          LONGITUDE:  76° 40.5' W ( -76.67547)


The bench mark is a standard disk set in the top of a .25 m (10 inch) concrete
cylinder, which is .05 m (2 inches) below ground surface, 29.7 m (97.4 feet)
north-northeast of 15-inch pine all with reference tags, 10.2 m (33.5 ft)
north-northwest of the centerline of US 17, 5.9 m (19.5 ft) south-southwest of
fence post,and 4.7 m (15.4 ft) south-southeast of fence post and 4.6 m (15.1 ft)
west of sign post.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  7

                                                                                
Station ID: 8651817                         PUBLICATION DATE:  12/04/2012
Name:       EDENHOUSE POINT                                   
            NC
NOAA Chart: 12205                           Latitude:   36°  3.3' N (  36.05503)
USGS Quad:  EDENOUSE                        Longitude:  76° 41.1' W ( -76.68425)


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


                         BENCH MARK STAMPING:  CHO-1 1974
                         DESIGNATION:          CHO 1

MONUMENTATION:           Survey disk                           VM#:        20457
AGENCY:                  NGS                                   IDB PID#:  FX2044
SETTING CLASSIFICATION:  Concrete wheelguard                   OPUS PID:        
LATITUDE:   36°  3.2' N (  36.05372)          LONGITUDE:  76° 41.0' W ( -76.68358)


The bench mark is a disk set flush in drill hole, 4.3 m (14.1 ft) southeast of
the centerline of US 17 and .3 m (1.0 ft) west of end of wheel guard and .2 m
(0.7 ft) NNW of SE end of bridge guard rail. The mark is 1.0 ft above centerline
of highway.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  7

                                                                                
Station ID: 8651817                         PUBLICATION DATE:  12/04/2012
Name:       EDENHOUSE POINT                                   
            NC
NOAA Chart: 12205                           Latitude:   36°  3.3' N (  36.05503)
USGS Quad:  EDENOUSE                        Longitude:  76° 41.1' W ( -76.68425)


                            T I D A L   D A T U M S 


Tidal datums at EDENHOUSE POINT based on:

     LENGTH OF SERIES:      3 MONTHS
     TIME PERIOD:           May 2012 - July 2012
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8652587 OREGON INLET MARINA, PAMLICO SOUND


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.133
     MEAN HIGH WATER                            MHW    =  0.122
     North American Vertical Datum              NAVD88 =  0.113
     MEAN TIDE LEVEL                            MTL    =  0.072
     MEAN SEA LEVEL                             MSL    =  0.071
     MEAN LOW WATER                             MLW    =  0.021
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     P 211 1979                                  1.266    1.144
     1817 A 2012                                 1.112    0.990
     1817 B 2012                                 1.188    1.066
     TOUR 1980                                   1.379    1.257
     CHO-1 1974                                  3.338    3.216


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  7

                                                                                
Station ID: 8651817                         PUBLICATION DATE:  12/04/2012
Name:       EDENHOUSE POINT                                   
            NC
NOAA Chart: 12205                           Latitude:   36°  3.3' N (  36.05503)
USGS Quad:  EDENOUSE                        Longitude:  76° 41.1' W ( -76.68425)


                             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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Products available at 8651817 Edenhouse Point, NC

Revised: 08/08/2018
NOAA / National Ocean Service
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