Bench Mark Sheet for 8659182, Oak Island, Atlantic Ocean 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  6

                                                                                
Station ID: 8659182                         PUBLICATION DATE:  03/04/2009
Name:       OAK ISLAND, ATLANTIC OCEAN                        
            NC
NOAA Chart: 11537                           Latitude:   33° 54.1' N (  33.90170)
USGS Quad:  SOUTHPORT                       Longitude:  78°  4.9' W ( -78.08170)


To reach the tidal bench marks from the intersection of State Highways 211 and
87 north of Southport, proceed NW on State Highway 211 for 2.7 km (1.7 mi) to
State Highway 133, then turn left and proceed south on State Highway 133 for 6.3
km (3.9 mi) to Live Oak Drive, then turn right and proceed west on Live Oak
Drive for 0.6 km (0.4 mi) to Womble Street, then turn left and proceed south on
Womble Street for 0.3 km (0.2 mi) to its end at the Yaupon Beach Fishing Pier. 
The bench marks are along State Highway 133 and Ocean Drive, which parallels the
shore.  The tide gage and staff were midway out on the Yaupon Beach Fishing
Pier.


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


                 PRIMARY BENCH MARK STAMPING:  9182 F 1977
                         DESIGNATION:          865 9182 F

MONUMENTATION:           Tidal Station disk                    VM#:         3644
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID#: BBCH34
LATITUDE:   33° 54.1' N (  33.90170)          LONGITUDE:  78°  4.9' W ( -78.08170)


The primary bench mark is a disk located in the center of the median of Barbee
Boulevard, 13 m (43 ft) north of the centerline of Ocean Drive, 10 m (32 ft)
east of the centerline of the southbound lane of Barbee Boulevard, 9 m (30 ft)
west of the centerline of the northbound lane of Barbee Boulevard, 1.04 m (3.4
ft) south of a witness post, and 0.98 m (3.2 ft) NE of power pole #TP-W267.  The
bench mark is 0.03 m (0.1 ft) below ground level, and crimped to the top of a
galvanized steel rod driven 13.4 m (44 ft) to substantial resistance.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  6

                                                                                
Station ID: 8659182                         PUBLICATION DATE:  03/04/2009
Name:       OAK ISLAND, ATLANTIC OCEAN                        
            NC
NOAA Chart: 11537                           Latitude:   33° 54.1' N (  33.90170)
USGS Quad:  SOUTHPORT                       Longitude:  78°  4.9' W ( -78.08170)


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


                         BENCH MARK STAMPING:  NO 1 1973
                         DESIGNATION:          865 9182 TIDAL 1

MONUMENTATION:           Tidal Station disk                    VM#:         3639
AGENCY:                  US Coast & Geodetic Survey
                         (USC&GS)                                 IDB PID#:        
SETTING CLASSIFICATION:  Concrete slab                         OPUS PID:        
LATITUDE:   33° 54.1' N (  33.90170)          LONGITUDE:  78°  4.9' W ( -78.08170)


The bench mark is a disk set in a concrete slab directly under the Yaupon Beach
Fishing Pier, on the seaward side of the pier, 15.70 m (51.5 ft) ESE of the SE
corner of the Playland Arcade building, and 9 m (31 ft) south of the SW corner
of the baithouse.  NOTE: The bench mark has been covered with a large amount of
concrete; 5/6/1991.



                         BENCH MARK STAMPING:  NO 2 1973
                         DESIGNATION:          865 9182 TIDAL 2

MONUMENTATION:           Tidal Station disk                    VM#:         3640
AGENCY:                  US Coast & Geodetic Survey
                         (USC&GS)                                 IDB PID#:        
SETTING CLASSIFICATION:  Concrete slab                         OPUS PID:        
LATITUDE:   33° 54.1' N (  33.90170)          LONGITUDE:  78°  4.9' W ( -78.08170)


The bench mark is a disk set in the SW corner of the concrete slab surrounding
the Oak Island Inn swimming pool, near the corner of Womble Street and Ocean
Drive, 14.51 m (47.6 ft) north of the center of Route 133.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  6

                                                                                
Station ID: 8659182                         PUBLICATION DATE:  03/04/2009
Name:       OAK ISLAND, ATLANTIC OCEAN                        
            NC
NOAA Chart: 11537                           Latitude:   33° 54.1' N (  33.90170)
USGS Quad:  SOUTHPORT                       Longitude:  78°  4.9' W ( -78.08170)


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


                         BENCH MARK STAMPING:  NO 3 1973
                         DESIGNATION:          865 9182 TIDAL 3

MONUMENTATION:           Tidal Station disk                    VM#:         3641
AGENCY:                  US Coast & Geodetic Survey
                         (USC&GS)                                 IDB PID#:        
SETTING CLASSIFICATION:  Concrete porch                        OPUS PID:        
LATITUDE:   33° 54.1' N (  33.90170)          LONGITUDE:  78°  4.9' W ( -78.08170)


The bench mark is a disk set in the west concrete porch of the Driftwood Motel,
between Kezian and Trott Streets, 42 m (138 ft) north of Ocean Drive, and 13.41
m (44.0 ft) from the NW corner of the porch.



                         BENCH MARK STAMPING:  NO 4 1973
                         DESIGNATION:          865 9182 TIDAL 4

MONUMENTATION:           Tidal Station disk                    VM#:         3642
AGENCY:                  US Coast & Geodetic Survey
                         (USC&GS)                                 IDB PID#:        
SETTING CLASSIFICATION:  Concrete walkway                      OPUS PID:        
LATITUDE:   33° 54.1' N (  33.90170)          LONGITUDE:  78°  4.9' W ( -78.08170)


The bench mark is a disk set in the NW corner of the concrete walkway
surrounding The Captain's Hut Restaurant, between Kezian and Trott Streets,
12.98 m (42.6 ft) south of the centerline of Ocean Drive.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  6

                                                                                
Station ID: 8659182                         PUBLICATION DATE:  03/04/2009
Name:       OAK ISLAND, ATLANTIC OCEAN                        
            NC
NOAA Chart: 11537                           Latitude:   33° 54.1' N (  33.90170)
USGS Quad:  SOUTHPORT                       Longitude:  78°  4.9' W ( -78.08170)


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


                         BENCH MARK STAMPING:  9182 G 1977
                         DESIGNATION:          865 9182 G

MONUMENTATION:           Tidal Station disk                    VM#:         3645
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID:        
LATITUDE:   33° 54.1' N (  33.90170)          LONGITUDE:  78°  4.9' W ( -78.08170)


The bench mark is a disk located 16 m (54 ft) NW of the center of the
intersection of Ocean Drive and Norton Street, 8.72 m (28.6 ft) SE of the SE
corner of Murphys Ocean Front Motel, and 1.19 m (3.9 ft) east of power pole
#TP-W66.  The bench mark is 0.30 m (1.0 ft) above ground level, and crimped to
the top of a galvanized steel rod driven 12.2 m (40 ft) to substantial
resistance.



                         BENCH MARK STAMPING:  9182 H 1977
                         DESIGNATION:          865 9182 H

MONUMENTATION:           Tidal Station disk                    VM#:         3646
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID:        
LATITUDE:   33° 54.1' N (  33.90170)          LONGITUDE:  78°  4.9' W ( -78.08170)


The bench mark is a disk located 15.70 m (51.5 ft) north of the center of the
intersection of State Highway 133 and Throckmorton Street, 11.28 m (37.0 ft) NE
of the centerline of Throckmorton Street, 10.52 m (34.5 ft) NW of the centerline
of State Highway 133, 1.37 m (4.5 ft) north of a power pole, and 1 m (3 ft)
south of a witness post.  The bench mark is 0.09 m (0.3 ft) below pavement
level, and crimped to the top of a galvanized steel rod driven 14.0 m (46 ft) to
substatial resistance.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  6

                                                                                
Station ID: 8659182                         PUBLICATION DATE:  03/04/2009
Name:       OAK ISLAND, ATLANTIC OCEAN                        
            NC
NOAA Chart: 11537                           Latitude:   33° 54.1' N (  33.90170)
USGS Quad:  SOUTHPORT                       Longitude:  78°  4.9' W ( -78.08170)


                            T I D A L   D A T U M S 


Tidal datums at OAK ISLAND, ATLANTIC OCEAN based on:

     LENGTH OF SERIES:      1 YEAR
     TIME PERIOD:           June 1996 - May 1997
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8661070 SPRINGMAID PIER, ATLANTIC OCEAN


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

     HIGHEST OBSERVED WATER LEVEL (10/08/1996)         =  2.508
     MEAN HIGHER HIGH WATER                     MHHW   =  1.605
     MEAN HIGH WATER                            MHW    =  1.491
     North American Vertical Datum              NAVD88 =  0.946
     MEAN SEA LEVEL                             MSL    =  0.776
     MEAN TIDE LEVEL                            MTL    =  0.771
     MEAN LOW WATER                             MLW    =  0.050
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (12/05/1978)         = -0.832

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     9182 F 1977                                 3.411    1.920
     NO 1 1973                                   3.557    2.066
     NO 2 1973                                   4.855    3.364
     NO 3 1973                                   5.372    3.881
     NO 4 1973                                   3.905    2.414
     9182 G 1977                                 4.385    2.894
     9182 H 1977                                 5.285    3.794


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

                                                                                
Station ID: 8659182                         PUBLICATION DATE:  03/04/2009
Name:       OAK ISLAND, ATLANTIC OCEAN                        
            NC
NOAA Chart: 11537                           Latitude:   33° 54.1' N (  33.90170)
USGS Quad:  SOUTHPORT                       Longitude:  78°  4.9' W ( -78.08170)


                             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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