Bench Mark Sheet for 8656539, LENOXVILLE POINT, NORTH RIVER CHANNEL 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8656539                         PUBLICATION DATE:  04/21/2003
Name:       LENOXVILLE POINT, NORTH RIVER CHANNEL             
            NC
NOAA Chart: 11545                           Latitude:   34° 42.5' N (  34.70830)
USGS Quad:  HARKERS ISLAND                  Longitude:  76° 37.2' W ( -76.62000)


To reach the tidal bench marks from the intersection of US Highway 70 and
Lenoxville Road in Beaufort, proceed east on Lenoxville Road for 3.2 km (2.0
miles) to an unmarked dirt gravel road on the right, at No. 2650 Lenoxville
Road.  The bench marks are located along Lenoxville Road and the tide gage was
located on the pier behind a pink house.


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


                 PRIMARY BENCH MARK STAMPING:  6539 B 1996
                         DESIGNATION:          865 6539 B

MONUMENTATION:           Bench Mark disk                       VM#:        13407
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   34° 42.5' N (  34.70830)          LONGITUDE:  76° 37.2' W ( -76.62000)


The primary bench mark is a disk set near the end of Lenoxville Road, 6.79 m
(22.3 ft) south of the centerline of Lenoxville Road, 5.61 m (18.4 ft) SW of a
gravel drive, and 0.82 m (2.7 ft) north of power pole No. NJS60 with
transformer.  The bench mark is 6 cm (0.2 ft) below ground level, crimped to a
stainless steel rod driven 7.3 m (24 ft) to refusal, and encased in a 5-inch PVC
pipe and concrete kickblock.

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

                                                                                
Station ID: 8656539                         PUBLICATION DATE:  04/21/2003
Name:       LENOXVILLE POINT, NORTH RIVER CHANNEL             
            NC
NOAA Chart: 11545                           Latitude:   34° 42.5' N (  34.70830)
USGS Quad:  HARKERS ISLAND                  Longitude:  76° 37.2' W ( -76.62000)


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


                         BENCH MARK STAMPING:  CAR 52 1982
                         DESIGNATION:          CAR 52 NCGS

MONUMENTATION:           Bench Mark disk                       VM#:        13405
AGENCY:                  North Carolina Geodetic Survey (NCGS) IDB PID#:  EA1510
SETTING CLASSIFICATION:  Gas pump base                         OPUS PID:        
LATITUDE:   34° 42.6' N (  34.71000)          LONGITUDE:  76° 37.3' W ( -76.62170)


The bench mark is a disk set in an abandoned gas pump base in the NW quadrant of
the intersection of Lenoxville Road and Lewistown Road, 17.37 m (57.0 ft) west
of the centerline of Lewistown Road, 14.39 m (47.0 ft) north of the centerline
of Lenoxville Road, 9.91 m (32.5 ft) NW of a power pole, 7.77 m (25.1 ft) SW of
the SE corner of an abandoned store building, 7.65 m (25.1 ft) SE of the SW
corner of the building, and 0.30 m (1.0 ft) above the road.



                         BENCH MARK STAMPING:  6539 C 1996
                         DESIGNATION:          865 6539 C

MONUMENTATION:           Bench Mark disk                       VM#:        13408
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Footing for septic tank system        OPUS PID#: DJ9291
LATITUDE:   34° 42.5' N (  34.70876)          LONGITUDE:  76° 37.2' W ( -76.62054)


The bench mark is a disk set flush in the SE corner of a concrete access cover
of a septic tank system, near the entrance to Taylor Creek Subdivision, 51.82 m
(170.0 ft) south of the centerline of Lenoxville Road, 15.48 m (50.8 ft) SE of
the entrance road to the subdivision, and 0.15 m (0.5 ft) NE of the south side
of the concrete pad.

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

                                                                                
Station ID: 8656539                         PUBLICATION DATE:  04/21/2003
Name:       LENOXVILLE POINT, NORTH RIVER CHANNEL             
            NC
NOAA Chart: 11545                           Latitude:   34° 42.5' N (  34.70830)
USGS Quad:  HARKERS ISLAND                  Longitude:  76° 37.2' W ( -76.62000)


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


                         BENCH MARK STAMPING:  6539 D 1996
                         DESIGNATION:          865 6539 D

MONUMENTATION:           Bench Mark disk                       VM#:        13409
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  DJ9288
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   34° 42.6' N (  34.71000)          LONGITUDE:  76° 37.3' W ( -76.62170)


The bench mark is a disk set 45.60 m (149.6 ft) west of the entrance road to
Taylor Creek Subdivision, 29.60 m (97.1 ft) east of power pole No. NJS49 with
transformer, 9.45 m (31.0 ft) south of the centerline of Lenoxville Road, and
1.19 m (3.9 ft) south of power pole No. NJG76 with witness sign.  The bench mark
is 12 cm (0.4 ft) below ground level, crimped to a stainless steel rod driven
8.5 m (28 ft) to refusal, and encased in a 5-inch PVC pipe and concrete
kickblock.

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

                                                                                
Station ID: 8656539                         PUBLICATION DATE:  04/21/2003
Name:       LENOXVILLE POINT, NORTH RIVER CHANNEL             
            NC
NOAA Chart: 11545                           Latitude:   34° 42.5' N (  34.70830)
USGS Quad:  HARKERS ISLAND                  Longitude:  76° 37.2' W ( -76.62000)


                            T I D A L   D A T U M S 


Tidal datums at LENOXVILLE POINT, NORTH RIVER CHANNEL based on:

     LENGTH OF SERIES:      2 Months
     TIME PERIOD:           July 1996 - August 1996
     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   =  0.830
     MEAN HIGH WATER                            MHW    =  0.758
     MEAN SEA LEVEL                             MSL    =  0.402
     MEAN TIDE LEVEL                            MTL    =  0.398
     MEAN LOW WATER                             MLW    =  0.037
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     6539 B 1996                                 2.624    1.866
     CAR 52 1982                                 1.798    1.040
     6539 C 1996                                 3.122    2.364
     6539 D 1996                                 2.050    1.292


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

                                                                                
Station ID: 8656539                         PUBLICATION DATE:  04/21/2003
Name:       LENOXVILLE POINT, NORTH RIVER CHANNEL             
            NC
NOAA Chart: 11545                           Latitude:   34° 42.5' N (  34.70830)
USGS Quad:  HARKERS ISLAND                  Longitude:  76° 37.2' W ( -76.62000)


                             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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