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Bench Mark Sheet for 8536581, BIDWELL CREEK ENTRANCE, DELAWARE BAY NJ

Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8536581                         PUBLICATION DATE:  07/02/2003
Name:       BIDWELL CREEK ENTRANCE, DELAWARE BAY              
            NJ
NOAA Chart: 12304                           Latitude:   39°  7.7' N (  39.12830)
USGS Quad:  HEISLERVILLE                    Longitude:  74° 53.5' W ( -74.89170)


To reach the tidal bench marks from the intersection of State Highway 47 and
Reeds Beach Road in Reeds Beach, proceed NW on Reeds Beach Road for 1.6 km (1
mi) to Beach Avenue, then turn right and proceed north on Beach Avenue for 1.1
km (0.7 mi) to the entrance driveway to Captain Walts Marina.  The bench marks
are along Beach Avenue and along the entrance driveway to the marina.  The tide
gage and staff were on the marina pier.


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


                 PRIMARY BENCH MARK STAMPING:  6581 C 1977
                         DESIGNATION:          853 6581 C

MONUMENTATION:           Tidal Station disk                    VM#:         2780
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID:        
LATITUDE:   39°  7.7' N (  39.12830)          LONGITUDE:  74° 53.5' W ( -74.89170)


The primary bench mark is a disk located along Beach Avenue 1.0 km (0.6 mi)
north of the intersection with Reeds Beach Road, 133 m (436 ft) south of bench
mark 6581 B 1977, 17.59 m (57.7 ft) NE of a utility pole with electric meter
attached, 5.33 m (17.5 ft) east of the centerline of Beach Avenue, 3 m (10 ft)
west of a steel guy wire post, and 1.43 m (4.7 ft) SE of utility pole #W25294. 
The bench mark is set 6 cm (0.2 ft) below ground level, crimped to the top of a
galvanized steel rod driven 15.2 m (50 ft) to substantial resistance.

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

                                                                                
Station ID: 8536581                         PUBLICATION DATE:  07/02/2003
Name:       BIDWELL CREEK ENTRANCE, DELAWARE BAY              
            NJ
NOAA Chart: 12304                           Latitude:   39°  7.7' N (  39.12830)
USGS Quad:  HEISLERVILLE                    Longitude:  74° 53.5' W ( -74.89170)


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


                         BENCH MARK STAMPING:  6581 B 1977
                         DESIGNATION:          853 6581 B

MONUMENTATION:           Tidal Station disk                    VM#:         2779
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID:        
LATITUDE:   39°  7.7' N (  39.12830)          LONGITUDE:  74° 53.5' W ( -74.89170)


The bench mark is a disk located along Beach Avenue at the entrance driveway to
Captain Walts Marina, 33.07 m (108.5 ft) west of utility pole #W29628, 19.11 m
(62.7 ft) south of a "No Trespassing" sign on the north side of the entrance
driveway, 10.36 m (34.0 ft) east of the centerline of Beach Avenue, 9.81 m (32.2
ft) north of utility pole #W29627, 8.32 m (27.3 ft) SE of the south gate post of
the marina entrance, and 3.32 m (10.9 ft) east of a steel cable fence.  The
bench mark is set 6 cm (0.2 ft) below ground level, crimped to the top of a
galvanized steel rod driven 15.2 m (50 ft) to substantial resistance.



                         BENCH MARK STAMPING:  6581 D 1977
                         DESIGNATION:          853 6581 D

MONUMENTATION:           Tidal Station disk                    VM#:         2781
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID:        
LATITUDE:   39°  7.7' N (  39.12830)          LONGITUDE:  74° 53.5' W ( -74.89170)


The bench mark is a disk located along Beach Avenue, 0.89 km (0.55 mi) north of
the intersection of Beach Avenue with Reeds Beach Road, 93.73 m (307.5 ft) south
of bench mark 6581 C 1977, 26.91 m (88.3 ft) south of utility pole #W25293, 5 m
(16 ft) east of the centerline of Beach Avenue, and 1.43 m (4.7 ft) SW of a
cedar tree.  The bench mark is set 6 cm (0.2 ft) below ground level, crimped to
the top of a galvanized steel rod driven 15.2 m (50 ft) to substantial
resistance.

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

                                                                                
Station ID: 8536581                         PUBLICATION DATE:  07/02/2003
Name:       BIDWELL CREEK ENTRANCE, DELAWARE BAY              
            NJ
NOAA Chart: 12304                           Latitude:   39°  7.7' N (  39.12830)
USGS Quad:  HEISLERVILLE                    Longitude:  74° 53.5' W ( -74.89170)


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


                         BENCH MARK STAMPING:  6581 E 1977
                         DESIGNATION:          853 6581 E

MONUMENTATION:           Tidal Station disk                    VM#:         2782
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID:        
LATITUDE:   39°  7.7' N (  39.12830)          LONGITUDE:  74° 53.5' W ( -74.89170)


The bench mark is a disk located along Beach Avenue 0.8 km (0.5 mi) north of the
intersection with Reeds Beach Road, 95 m (312 ft) south of bench mark 6581 D
1977, 5 m (16 ft) east of the centerline of Beach Avenue, 4.45 m (14.6 ft) SW of
a utility pole with electric meter attached, and 1.71 m (5.6 ft) north of
utility pole #W16173.  The bench mark is set 6 cm (0.2 ft) below ground level,
crimped to the top of a galvanized steel rod driven 15.2 m (50 ft) to
substantial resistance.

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

                                                                                
Station ID: 8536581                         PUBLICATION DATE:  07/02/2003
Name:       BIDWELL CREEK ENTRANCE, DELAWARE BAY              
            NJ
NOAA Chart: 12304                           Latitude:   39°  7.7' N (  39.12830)
USGS Quad:  HEISLERVILLE                    Longitude:  74° 53.5' W ( -74.89170)


                            T I D A L   D A T U M S 


Tidal datums at BIDWELL CREEK ENTRANCE, DELAWARE BAY based on:

     LENGTH OF SERIES:      7 MONTHS
     TIME PERIOD:           April 1978 - October 1978
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8557380 LEWES, FT. MILES


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

     MEAN HIGHER HIGH WATER                     MHHW   =  1.918
     MEAN HIGH WATER                            MHW    =  1.787
     MEAN SEA LEVEL                             MSL    =  0.962
     MEAN TIDE LEVEL                            MTL    =  0.923
     MEAN LOW WATER                             MLW    =  0.058
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     6581 C 1977                                 2.326    0.539
     6581 B 1977                                 2.785    0.998
     6581 D 1977                                 2.378    0.591
     6581 E 1977                                 2.698    0.911


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

                                                                                
Station ID: 8536581                         PUBLICATION DATE:  07/02/2003
Name:       BIDWELL CREEK ENTRANCE, DELAWARE BAY              
            NJ
NOAA Chart: 12304                           Latitude:   39°  7.7' N (  39.12830)
USGS Quad:  HEISLERVILLE                    Longitude:  74° 53.5' W ( -74.89170)


                             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 8536581 BIDWELL CREEK ENTRANCE, DELAWARE BAY, NJ

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