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Bench Mark Sheet for 8652247, Manns Harbor 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8652247                         PUBLICATION DATE:  02/26/2004
Name:       MANNS HARBOR, CROATAN SOUND                       
            NC
NOAA Chart: 12205                           Latitude:   35° 54.2' N (  35.90330)
USGS Quad:  MANNS HARBOR                    Longitude:  75° 46.2' W ( -75.77000)


To reach the tidal bench marks from the west end of the William B. Umstead
bridge (US Highway 64-264), proceed south on US 64-264 for 0.9 km (0.5 mi) to
Old Ferry Dock Road (SR 1111), bear left onto Old Ferry Dock Road and continue
0.5 km (0.3 mi) to street address 5678 Old Ferry Dock Road on the east side of
the road.  The bench marks are located on this property and along the road.  The
tide gauge was located on the end of the T-dock that protrudes into Croatan
Sound from the shore at the above address.


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


                 PRIMARY BENCH MARK STAMPING:  2247 A 2002
                         DESIGNATION:          865 2247 A

MONUMENTATION:           Flange-encased Rod                    VM#:        16744
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod in sleeve         OPUS PID:        
LATITUDE:   35° 54.2' N (  35.90330)          LONGITUDE:  75° 46.2' W ( -75.77000)


The primary bench mark is a flange-encased rod set on the NE corner of the
property of 5678 Old Ferry Dock Road, 14.78 m (48.5 ft) east of the SE corner of
a blue garage, 12.95 m (42.5 ft) north of the NW corner of a dock walkway where
the walkway meets the grass, and 4.87 m (16.0 ft) west of the west edge of a
concrete rip-rap wall on the water's edge.  The datum point is set 6 cm (0.2 ft)
below grade, being the top of a stainless steel rod driven 43.5 m (143 ft) to
substantial resistance and encased in a 5-inch NOS logo cap.

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

                                                                                
Station ID: 8652247                         PUBLICATION DATE:  02/26/2004
Name:       MANNS HARBOR, CROATAN SOUND                       
            NC
NOAA Chart: 12205                           Latitude:   35° 54.2' N (  35.90330)
USGS Quad:  MANNS HARBOR                    Longitude:  75° 46.2' W ( -75.77000)


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


                         BENCH MARK STAMPING:  2247 B 2002
                         DESIGNATION:          865 2247 B

MONUMENTATION:           Flange-encased Rod                    VM#:        16745
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod in sleeve         OPUS PID:        
LATITUDE:   35° 54.2' N (  35.90330)          LONGITUDE:  75° 46.3' W ( -75.77170)


The bench mark is a flange-encased rod set on the NW corner of the property at
5678 Old Ferry Dock Road, 23.83 m (78.2 ft) WNW of the NW corner of the house at
5678 Old Ferry Dock Road, 18.10 m (59.4 ft) east of the centerline of Old Ferry
Dock Road, and 11.18 m (36.7 ft) NNW of a utility pole set in the front yard of
5678 Old Ferry Dock Road.  The datum point is set 9 cm (0.3 ft) below grade,
being the top of a stainless steel rod driven 28.6 m (94 ft) to substantial
resistance and encased in a 5-inch NOS logo cap.    



                         BENCH MARK STAMPING:  2247 C 2002
                         DESIGNATION:          865 2247 C

MONUMENTATION:           Flange-encased Rod                    VM#:        16746
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod in sleeve         OPUS PID:        
LATITUDE:   35° 54.2' N (  35.90330)          LONGITUDE:  75° 46.3' W ( -75.77170)


The bench mark is a flange-encased rod set on the north side of the property at
5689 Old Ferry Dock Road, 49.01 m (160.8 ft) west of the centerline of Old Ferry
Dock Road, 22.61 m (74.2 ft) NNW of a 0.3 m (1 ft) square (wood) driveway lamp
post, and 1.95 m (6.4 ft) NE of a 5 m by 6 m (18 ft by 20 ft) (metal) garden
shed.  The datum point is set 6 cm (0.2 ft) below grade, being the top of a
stainless steel rod driven 24.9 m (82 ft) to substantial resistance and encased
in a 5-inch NOS logo cap.    

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

                                                                                
Station ID: 8652247                         PUBLICATION DATE:  02/26/2004
Name:       MANNS HARBOR, CROATAN SOUND                       
            NC
NOAA Chart: 12205                           Latitude:   35° 54.2' N (  35.90330)
USGS Quad:  MANNS HARBOR                    Longitude:  75° 46.2' W ( -75.77000)


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


                         BENCH MARK STAMPING:  2247 D 2002
                         DESIGNATION:          865 2247 D

MONUMENTATION:           Flange-encased Rod                    VM#:        16747
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod in sleeve         OPUS PID:        
LATITUDE:   35° 54.2' N (  35.90330)          LONGITUDE:  75° 46.3' W ( -75.77170)


The bench mark is a flange-encased rod set in the NE corner of the property at
5659 Old Ferry Dock Road, 19.63 m (64.4 ft) NNE of the NE corner of a 0.6 m by
0.9 m (2 ft by 3 ft) well pump shed, 11.76 m (38.6 ft) west of the centerline of
Old Ferry Dock Road, and 8.53 m (28.0 ft) ESE of a utility pole set in the
property of 5689 Old Ferry Dock Road.  The datum point is set 9 cm (0.3 ft)
below grade, being the top of a stainless steel rod driven 28.4 m (93 ft) to
substantial resistance and encased in a 5-inch NOS logo cap.



                         BENCH MARK STAMPING:  2247 E 2002
                         DESIGNATION:          865 2247 E

MONUMENTATION:           Flange-encased Rod                    VM#:        16748
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod in sleeve         OPUS PID#: BBCL76
LATITUDE:   35° 54.2' N (  35.90330)          LONGITUDE:  75° 46.3' W ( -75.77170)


The bench mark is a flange-encased rod set in the SE corner of the building lot
immediately south of 5659 Old Ferry Dock Road, 24.38 m (80.0 ft) east of the NE
corner of a 3 m by 5 m (10 ft by 16 ft) (wood) garden shed, 12.37 m (40.6 ft)
west of the centerline of Old Ferry Dock Road, and 3.14 m (10.3 ft) WNW of a
1.5-inch steel pipe that protrudes 0.40 m (1.3 ft) above grade and marks the SE
property corner of the building lot.  The datum point is set 9 cm (0.3 ft) below
grade, being the top of a stainless steel rod driven 29.6 m (97 ft) to
substantial resistance and encased in a 5-inch NOS logo cap.      

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

                                                                                
Station ID: 8652247                         PUBLICATION DATE:  02/26/2004
Name:       MANNS HARBOR, CROATAN SOUND                       
            NC
NOAA Chart: 12205                           Latitude:   35° 54.2' N (  35.90330)
USGS Quad:  MANNS HARBOR                    Longitude:  75° 46.2' W ( -75.77000)


                            T I D A L   D A T U M S 


Tidal datums at MANNS HARBOR, CROATAN SOUND based on:

     LENGTH OF SERIES:      4 MONTHS
     TIME PERIOD:           June 2002 - September 2002
     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   =  0.124
     MEAN HIGH WATER                            MHW    =  0.116
     MEAN TIDE LEVEL                            MTL    =  0.069
     MEAN SEA LEVEL                             MSL    =  0.066
     MEAN LOW WATER                             MLW    =  0.022
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     2247 A 2002                                 0.953    0.837
     2247 B 2002                                 1.017    0.901
     2247 C 2002                                 0.819    0.703
     2247 D 2002                                 0.568    0.452
     2247 E 2002                                 0.652    0.536


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

                                                                                
Station ID: 8652247                         PUBLICATION DATE:  02/26/2004
Name:       MANNS HARBOR, CROATAN SOUND                       
            NC
NOAA Chart: 12205                           Latitude:   35° 54.2' N (  35.90330)
USGS Quad:  MANNS HARBOR                    Longitude:  75° 46.2' W ( -75.77000)


                             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 8652247 Manns Harbor, NC

Revised: 08/08/2018
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services