Bench Mark Sheet for 8656467, Spooners Creek 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8656467                         PUBLICATION DATE:  12/20/2012
Name:       SPOONERS CREEK                                    
            NC
NOAA Chart: 11541                           Latitude:   34° 43.5' N (  34.72500)
USGS Quad:  MANSFIELD                       Longitude:  76° 48.2' W ( -76.80330)


To reach the tidal bench marks from Beaufort-Morehead City airport in Morehead
City North Carolina, proceed SE on Airport Rd for 0.3 km (0.2 mi) to the
intersection with Highway 101, turn right and proceed SSE for 1.0 km (0.6 mi) to
the intersection of Highway 101 and Highway 70, keep right and merge onto
Highway 70 (Live Oak Street) proceeding SW for 1.1 km (0.7 mi) to the
intersection with Cedar Street, turn right and proceed westerly on Highway 70
(Cedar Street) for 13.0 km (8.1 mi) to the intersection of Highway 70 and
Highway 24, turn left and proceed west on Highway 24 for 1.3 km (0.8 mi) to
Harbor Drive, turn left and proceed south on Harbor Drive 0.8 km (0.5 mi) to its
termination at Lands End Road, turn left and proceed east along Lands End Road
for 0.2 km (0.1 mi) to the cul-de-sac and gated entrance to the Marina.  The
bench marks are located along Lands End Road and the waterfront area.  The tide
gauge is located at the end of the cul-de-sac of Lands End Road.


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


                 PRIMARY BENCH MARK STAMPING:  6467 A 2012
                         DESIGNATION:          865 6467 A

MONUMENTATION:           Survey disk                           VM#:        20405
AGENCY:                  NOS                                   IDB PID#:        
SETTING CLASSIFICATION:  Concrete seawall                      OPUS PID:        
LATITUDE:   34° 43.5' N (  34.72583)          LONGITUDE:  76° 48.2' W ( -76.80381)


The primary bench mark is a disk set in the top of a concrete seawall, 56.65 m
(185.9 ft) west-northwest of the eastern end of the seawall, 28.4 m (93.2 ft)
east-northeast of the east side of a stairway, 10.18 m (33.4 ft) east-southeast
of the northeast corner of a wooden utility shed, 1.62 m (5.3 ft)
north-northeast of the brick retaining wall, 1.25 m (4.1 ft) west-northwest of a
metal dock cleat and 0.33 m (1.1 ft) south-southwest of the fifth wooden piling
from the channel.

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

                                                                                
Station ID: 8656467                         PUBLICATION DATE:  12/20/2012
Name:       SPOONERS CREEK                                    
            NC
NOAA Chart: 11541                           Latitude:   34° 43.5' N (  34.72500)
USGS Quad:  MANSFIELD                       Longitude:  76° 48.2' W ( -76.80330)


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


                         BENCH MARK STAMPING:  6467 B 2012
                         DESIGNATION:          865 6467 B

MONUMENTATION:           Survey disk                           VM#:        20406
AGENCY:                  NOS                                   IDB PID#:        
SETTING CLASSIFICATION:  Concrete seawall                      OPUS PID#: BBCS30
LATITUDE:   34° 43.5' N (  34.72561)          LONGITUDE:  76° 48.2' W ( -76.80322)


The bench mark is a disk set in the top of a concrete seawall on the westside of
the entrance to Spooner's Creek Marina, 50.85 m (166.8 ft) east-southeast of the
top back curb on the east side of the cul-de-sac, 35.40 m (116.1 ft) southeast
of the eastern most wood piling, 31.52 m (103.4 ft) north of the southern corner
of the seawall, 12.88 m (42.3 ft) southeast of the eastern end of the brick
retaining wall and 5.74 m (18.8 ft) south of the northern corner of the seawall.




                         BENCH MARK STAMPING:  6467 C 2012
                         DESIGNATION:          865 6467 C

MONUMENTATION:           Survey disk                           VM#:        20407
AGENCY:                  NOS                                   IDB PID#:        
SETTING CLASSIFICATION:  Concrete pad                          OPUS PID:        
LATITUDE:   34° 43.5' N (  34.72578)          LONGITUDE:  76° 48.4' W ( -76.80608)


The bench mark is a disk set in the southwest corner of the concrete pad for a
green utility box on the north side of Lands End road, 9.87 m (32.4 ft)
west-northwest of a light pole, 6.90 m (22.6 ft) southwest of an entrance to a
ground floor parking garage beneath a building, 6.68 m (21.9 ft) north of the
top back of curb of the road, 3.36 m (11.0 ft) west-northwest of the southwest
corner of a concrete pad for an air conditioning unit, 0.22 m (0.7 ft) southwest
of the southwest corner of the utility box and 0.16 m (0.5 ft) north-northeast
of the southwest corner of the concrete pad.  

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

                                                                                
Station ID: 8656467                         PUBLICATION DATE:  12/20/2012
Name:       SPOONERS CREEK                                    
            NC
NOAA Chart: 11541                           Latitude:   34° 43.5' N (  34.72500)
USGS Quad:  MANSFIELD                       Longitude:  76° 48.2' W ( -76.80330)


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


                         BENCH MARK STAMPING:  6467 D 2012
                         DESIGNATION:          865 6467 D

MONUMENTATION:           Survey disk                           VM#:        20408
AGENCY:                  NOS                                   IDB PID#:        
SETTING CLASSIFICATION:  Bridge abutment                       OPUS PID:        
LATITUDE:   34° 43.6' N (  34.72642)          LONGITUDE:  76° 48.4' W ( -76.80625)


The bench mark is a disk set in the west end of the southern bridge abutment
north of the Spooner's Creek Marina office and underneath a paver stone, 17.50 m
(57.4 ft) south-southeast of a manhole cover, 16.43 m (53.9 ft) east of the gate
to the swimming pool, 13.68 m (44.9 ft) west-southwest of the boardwalk on top
of the seawall, 10.80 m (35.4 ft) southeast of a light pole, 5.33 m (17.5 ft)
northeast of the northeast corner of the marina office building and 0.10 m (0.3
ft) below grade.  



                         BENCH MARK STAMPING:  6467 E 2012
                         DESIGNATION:          865 6467 E

MONUMENTATION:           Survey disk                           VM#:        20409
AGENCY:                  NOS                                   IDB PID#:        
SETTING CLASSIFICATION:  Concrete seawall                      OPUS PID:        
LATITUDE:   34° 43.6' N (  34.72667)          LONGITUDE:  76° 48.4' W ( -76.80692)


The bench mark is set in the top of a concrete seawall at the north end of
Spooner's Creek Marina, 22.4 m (73.5 ft) northeast of an old oak tree, 9.38 m
(30.8 ft) northwest of the northwest corner of the concrete pad for a green
utility box, 3.55 m (11.6 ft) east of the east end of a brick retaining wall,
2.96 m (9.7 ft) west-northwest of a corner in the seawall and 0.34 m (1.1 ft)
south of the north edge of the seawall.  

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

                                                                                
Station ID: 8656467                         PUBLICATION DATE:  12/20/2012
Name:       SPOONERS CREEK                                    
            NC
NOAA Chart: 11541                           Latitude:   34° 43.5' N (  34.72500)
USGS Quad:  MANSFIELD                       Longitude:  76° 48.2' W ( -76.80330)


                            T I D A L   D A T U M S 


Tidal datums at SPOONERS CREEK based on:

     LENGTH OF SERIES:      4 MONTHS
     TIME PERIOD:           April 2012 - July 2012
     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   =  0.596
     MEAN HIGH WATER                            MHW    =  0.534
     MEAN SEA LEVEL                             MSL    =  0.300
     MEAN TIDE LEVEL                            MTL    =  0.286
     MEAN LOW WATER                             MLW    =  0.038
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     6467 A 2012                                 2.838    2.304
     6467 B 2012                                 2.848    2.314
     6467 C 2012                                 4.092    3.558
     6467 D 2012                                 3.520    2.986
     6467 E 2012                                 3.420    2.886


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

                                                                                
Station ID: 8656467                         PUBLICATION DATE:  12/20/2012
Name:       SPOONERS CREEK                                    
            NC
NOAA Chart: 11541                           Latitude:   34° 43.5' N (  34.72500)
USGS Quad:  MANSFIELD                       Longitude:  76° 48.2' W ( -76.80330)


                             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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