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Bench Mark Sheet for 8535375, Townsend Inlet 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8535375                         PUBLICATION DATE:  07/31/2014
Name:       TOWNSEND INLET                                    
            NJ
NOAA Chart: 12316                           Latitude:   39°  7.3' N (  39.12170)
USGS Quad:  SEA ISLE CITY                   Longitude:  74° 43.0' W ( -74.71670)


To reach the tidal bench marks from the intersection of U.S. Highway 9 and Sea
Isle Boulevard in Ocean View, proceed SE on Sea Isle Boulevard for 4.5 km (2.8
mi) to the intersection with Landis Avenue, turn right and proceed SW on Landis
Avenue for 3.8 km (2.3 mi) to the intersection with 86th Street, turn right and
then head NW on 86th Street for 170 m (557 ft) to its termination at Sunset Pier
Restaurant and Marina. The bench marks are located along Landis Avenue from the
United States Coast Guard Station to the Townsends Inlet Toll Bridge. The tide
gauges and staff are located on the western side of Sunset Pier Restaurant and
Marina property at the NW end of the pier.


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


                 PRIMARY BENCH MARK STAMPING:  5375 E 1977
                         DESIGNATION:          853 5375 E

MONUMENTATION:           Tidal Station disk                    VM#:        20839
AGENCY:                  National Ocean Service                IDB PID#:        
SETTING CLASSIFICATION:  Concrete Bridge Support Footing       OPUS PID:        
LATITUDE:   39°  7.2' N (  39.11994)          LONGITUDE:  74° 42.9' W ( -74.71544)


The primary bench mark is a disk set in top of a 8-foot diameter concrete
footing supporting the east of two bridge columns third from the water line, on
the northern side of Townsends Inlet and under the bridge, 11.23 m (36.8 ft) SSE
of the SW corner of the west concrete piling in the southernmost set of three
columns supporting a cap beam, 9.47 m (31.1 ft) SSW of the SE corner of the east
concrete piling in the southernmost set three columns supporting a cap beam,
6.09 m (20.0 ft) ESE of the NW corner of the west column of the third bridge
support from water, 0.26 m (0.9 ft) north of the north face of the east concrete
column third from the water line.

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

                                                                                
Station ID: 8535375                         PUBLICATION DATE:  07/31/2014
Name:       TOWNSEND INLET                                    
            NJ
NOAA Chart: 12316                           Latitude:   39°  7.3' N (  39.12170)
USGS Quad:  SEA ISLE CITY                   Longitude:  74° 43.0' W ( -74.71670)


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


                         BENCH MARK STAMPING:  TOWNSEND 1932
                         DESIGNATION:          TOWNSEND

MONUMENTATION:           Triangulation Station disk            VM#:        20840
AGENCY:                  US Coast & Geodetic Survey            IDB PID#:  JU2926
SETTING CLASSIFICATION:  Concrete Post                         OPUS PID#: JU2926
LATITUDE:   39°  7.7' N (  39.12819)          LONGITUDE:  74° 42.6' W ( -74.70928)


The bench mark is a disk set in top of a 12-inch concrete monument in the lawn
of the United States Coast Guard (USCG) recreation facility at 8101 Landis
Avenue, 28.11 m (92.2 ft) west of the centerline of Pleasure Avenue, 27.06 m
(88.8 ft) ESE of the NE corner of a brick USCG outbuilding, 27.00 m (88.5 ft)
SSE of the USCG flag pole, 23.72 m (77.8 ft) SSW of the SE corner of the main
structure on the USCG property, 16.23 m (53.2 ft) ESE of reference mark TOWNSEND
5, and 1.42 m (4.6 ft) WNW of the edge of the parking lot pavement.



                         BENCH MARK STAMPING:  5375 B 1977
                         DESIGNATION:          853 5375 B

MONUMENTATION:           Tidal Station disk                    VM#:        20841
AGENCY:                  National Ocean Service                IDB PID#:        
SETTING CLASSIFICATION:  5/8-inch Galvanized Steel Rod         OPUS PID:        
LATITUDE:   39°  7.3' N (  39.12217)          LONGITUDE:  74° 42.9' W ( -74.71472)


The bench mark is a disk located in the SW corner of the gravel yard of 9205
Landis Avenue, 11.10 m (36.4 ft) ESE of the centerline of Landis Avenue, 10.55 m
(34.6 ft) NNE of the centerline of 93rd Street, 8.95 m (29.4 ft) west of the SW
corner of 9205 Landis Avenue, and 4.16 m (13.6 ft) east of a utility pole
numbered 557 at the corner of 93rd Street and Landis Avenue. The bench mark is
crimped to a galvanized steel drive rod driven 15.2 m (50 ft), and encased in a
4-inch PVC pipe.

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

                                                                                
Station ID: 8535375                         PUBLICATION DATE:  07/31/2014
Name:       TOWNSEND INLET                                    
            NJ
NOAA Chart: 12316                           Latitude:   39°  7.3' N (  39.12170)
USGS Quad:  SEA ISLE CITY                   Longitude:  74° 43.0' W ( -74.71670)


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


                         BENCH MARK STAMPING:  5375 C 1977
                         DESIGNATION:          853 5375 C

MONUMENTATION:           Tidal Station disk                    VM#:        20842
AGENCY:                  National Ocean Service                IDB PID#:        
SETTING CLASSIFICATION:  Concrete Bridge Abutment              OPUS PID:        
LATITUDE:   39°  7.3' N (  39.12125)          LONGITUDE:  74° 42.9' W ( -74.71528)


The bench mark is a disk set in top of a concrete bridge abutment just north of
an expansion joint on the west side of the northern end of the bridge over
Townsends Inlet, 15.56 m (51.0 ft) SW of the concrete post at the end of the
railing on the east side of bridge, 14.66 m (48.1 ft) SSW of a metal  Bridge Has
Steel Grid Deck  sign, 3.44 m (11.2 ft) WNW of the centerline of Ocean Drive,
1.27 m (4.2 ft) south of a utility pole numbered BT31S1, 0.35 m (1.1 ft) WNW of
the curb edge of Ocean Drive, and 0.25 m (0.8 ft) above road level.



                         BENCH MARK STAMPING:  5375 D 1977
                         DESIGNATION:          853 5375 D

MONUMENTATION:           Tidal Station disk                    VM#:        20843
AGENCY:                  National Ocean Service                IDB PID#:        
SETTING CLASSIFICATION:  5/8-inch Galvanized Steel Rod         OPUS PID:        
LATITUDE:   39°  7.2' N (  39.12069)          LONGITUDE:  74° 42.9' W ( -74.71528)


The bench mark is a disk located in the sand on the east side of the northern
end of the bridge over Townsends Inlet, 82.50 m (270.7 ft) NNE of bench mark 853
5375 E, 15.20 m (49.9 ft) south of a utility pole numbered W32729, 6.11 m (20.0
ft) NE of the NE corner of fifth concrete cap beam south of the northern bridge
abutment, 3.91 m (12.8 ft) SE of the SE corner of fourth concrete cap beam south
from the northern bridge abutment. The bench mark is set 0.69 m (2.3 ft) below
grade and 3.46 m (11.4 ft) below the level of the bridge, crimped to a 5/8-inch
galvanized steel drive rod driven 15.2 m (50 ft).

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

                                                                                
Station ID: 8535375                         PUBLICATION DATE:  07/31/2014
Name:       TOWNSEND INLET                                    
            NJ
NOAA Chart: 12316                           Latitude:   39°  7.3' N (  39.12170)
USGS Quad:  SEA ISLE CITY                   Longitude:  74° 43.0' W ( -74.71670)


                            T I D A L   D A T U M S 


Tidal datums at TOWNSEND INLET based on:

     LENGTH OF SERIES:      9 MONTHS
     TIME PERIOD:           August 2013 - April 2014
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8534720 ATLANTIC CITY, ATLANTIC OCEAN


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

     MEAN HIGHER HIGH WATER                     MHHW   =  1.380
     MEAN HIGH WATER                            MHW    =  1.261
     MEAN SEA LEVEL                             MSL    =  0.671
     MEAN TIDE LEVEL                            MTL    =  0.658
     MEAN LOW WATER                             MLW    =  0.055
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     5375 E 1977                                 1.632    0.371
     TOWNSEND 1932                               3.017    1.756
     5375 B 1977                                 2.821    1.560
     5375 C 1977                                 4.042    2.781
     5375 D 1977                                 2.354    1.093


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

                                                                                
Station ID: 8535375                         PUBLICATION DATE:  07/31/2014
Name:       TOWNSEND INLET                                    
            NJ
NOAA Chart: 12316                           Latitude:   39°  7.3' N (  39.12170)
USGS Quad:  SEA ISLE CITY                   Longitude:  74° 43.0' W ( -74.71670)


                             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 8535375 Townsend Inlet, NJ

Revised: 08/08/2018
NOAA / National Ocean Service
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