Bench Mark Sheet for 8538875, POMPESTON CREEK, DELAWARE RIVER 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  6

                                                                                
Station ID: 8538875                         PUBLICATION DATE:  05/12/2004
Name:       POMPESTON CREEK, DELAWARE RIVER                   
            NJ
NOAA Chart: 12314                           Latitude:   40°  0.8' N (  40.01330)
USGS Quad:  FRANK FORD                      Longitude:  75°  0.5' W ( -75.00830)


To reach the tidal bench marks from the intersection of North Broad Street and
Public Road in Palmyra, proceed 2.6 km (1.6 mi) NE along North Broad Street
(which becomes River Road) to Canal Avenue, then turn left and proceed NW on
Canal Avenue for 0.2 km (0.1 mi) to Lippincott Boat Works.  The bench marks are
located along Canal Avenue and North Broad Street.  The tide gage and staff were
located behind the boat works building on two boat hoist ramps.


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


                 PRIMARY BENCH MARK STAMPING:  8875 A 1977
                         DESIGNATION:          853 8875 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         2870
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID:        
LATITUDE:   40°  0.8' N (  40.01330)          LONGITUDE:  75°  0.5' W ( -75.00830)


The primary bench mark is a disk located 23.87 m (78.3 ft) NW of the NW corner
of the 2-story concrete block Arthur Jervis Tool Company building, 23.74 m (77.9
ft) south of the SE corner of the office building, 23.20 m (76.1 ft) north of
the SW corner of the same building, and 18.75 m (61.5 ft) SW of wood utility
pole #60750CN.  The bench mark is set below ground level, crimped to the top of
a galvanized steel rod driven 15.2 m (50 ft) to refusal, and encased in a PVC
pipe and concrete kickblock.  NOTE: 4/1989 NJGS: Not found due to fiberglass
mold on top of this location.

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

                                                                                
Station ID: 8538875                         PUBLICATION DATE:  05/12/2004
Name:       POMPESTON CREEK, DELAWARE RIVER                   
            NJ
NOAA Chart: 12314                           Latitude:   40°  0.8' N (  40.01330)
USGS Quad:  FRANK FORD                      Longitude:  75°  0.5' W ( -75.00830)


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


                         BENCH MARK STAMPING:  8875 B 1977
                         DESIGNATION:          853 8875 B TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         2871
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AB6684
SETTING CLASSIFICATION:  Bridge sidewalk                       OPUS PID#: AB6684
LATITUDE:   40°  0.7' N (  40.01170)          LONGITUDE:  75°  0.5' W ( -75.00830)


The bench mark is a disk set in the top of the sidewalk at the NW corner of the
bridge over the Pompeston Creek, 113 m (370 ft) SE of bench mark 8875 A 1977,
9.94 m (32.6 ft) SW of utility pole #E63348CN, 1.58 m (5.2 ft) NW of the NW curb
of North Broad Street,  0.12 m (0.4 ft) SE of the NW concrete bridge railing,
and level with the ground.



                         BENCH MARK STAMPING:  8875 C 1977
                         DESIGNATION:          853 8875 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         2872
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AB6685
SETTING CLASSIFICATION:  Bridge sidewalk                       OPUS PID#: AB6685
LATITUDE:   40°  0.7' N (  40.01170)          LONGITUDE:  75°  0.5' W ( -75.00830)


The bench mark is a disk set in top of the sidewalk at the SE corner of the
bridge, 7.41 m (24.3 ft) NW of the NW rail of the nearby railroad tracks, 3.41 m
(11.2 ft) NE of the south end of a concrete bridge railing, and 0.30 m (1.0 ft)
SE of the SE curb of North Broad Street.

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

                                                                                
Station ID: 8538875                         PUBLICATION DATE:  05/12/2004
Name:       POMPESTON CREEK, DELAWARE RIVER                   
            NJ
NOAA Chart: 12314                           Latitude:   40°  0.8' N (  40.01330)
USGS Quad:  FRANK FORD                      Longitude:  75°  0.5' W ( -75.00830)


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


                         BENCH MARK STAMPING:  8875 D 1977
                         DESIGNATION:          853 8875 D TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         2873
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AB6683
SETTING CLASSIFICATION:  Manhole chamber                       OPUS PID:        
LATITUDE:   40°  0.7' N (  40.01170)          LONGITUDE:  75°  0.5' W ( -75.00830)


The bench mark is a disk set in top of a concrete manhole base, 113.02 m (370.8
ft) SW of bench mark 8875 C 1977, 21.88 m (71.8 ft) NE of wood utility pole
#60320T, 6.89 m (22.6 ft) NE of a fire hydrant, 4.33 m (14.2 ft) NW of the west
curb of North Broad Street, and 0.70 m (2.3 ft) SE of a water valve.

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

                                                                                
Station ID: 8538875                         PUBLICATION DATE:  05/12/2004
Name:       POMPESTON CREEK, DELAWARE RIVER                   
            NJ
NOAA Chart: 12314                           Latitude:   40°  0.8' N (  40.01330)
USGS Quad:  FRANK FORD                      Longitude:  75°  0.5' W ( -75.00830)


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


                         BENCH MARK STAMPING:  V 75 1974
                         DESIGNATION:          V 75

MONUMENTATION:           Vertical Control disk                 VM#:         2874
AGENCY:                  US Coast & Geodetic Survey
                         (USC&GS)                                 IDB PID#:  KV1863
SETTING CLASSIFICATION:  Bridge abutment                       OPUS PID:        
LATITUDE:   40°  0.7' N (  40.01170)          LONGITUDE:  75°  0.4' W ( -75.00670)


The bench mark is a disk set in the top of the south end of the NE abutment of
the railroad bridge over Pompeston Creek, 14.72 m (48.3 ft) south of the NE
corner of North Broad Street bridge over the creek, and 4.82 m (15.8 ft) SE of
the SE rail.

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

                                                                                
Station ID: 8538875                         PUBLICATION DATE:  05/12/2004
Name:       POMPESTON CREEK, DELAWARE RIVER                   
            NJ
NOAA Chart: 12314                           Latitude:   40°  0.8' N (  40.01330)
USGS Quad:  FRANK FORD                      Longitude:  75°  0.5' W ( -75.00830)


                            T I D A L   D A T U M S 


Tidal datums at POMPESTON CREEK, DELAWARE RIVER based on:

     LENGTH OF SERIES:      2 MONTHS
     TIME PERIOD:           October 1977 - November 1977
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8545530 PHILADELPHIA (PIER 11 NORTH), DEL. RIVER


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

     MEAN HIGHER HIGH WATER                     MHHW   =  2.085
     MEAN HIGH WATER                            MHW    =  1.979
     MEAN SEA LEVEL                             MSL    =  1.020
     MEAN TIDE LEVEL                            MTL    =  1.006
     North American Vertical Datum              NAVD88 =  0.888
     MEAN LOW WATER                             MLW    =  0.032
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     8875 A 1977                                 2.199    0.220
     8875 B 1977                                 4.260    2.281
     8875 C 1977                                 4.448    2.469
     8875 D 1977                                 4.805    2.826
     V 75 1974                                   2.907    0.928


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

                                                                                
Station ID: 8538875                         PUBLICATION DATE:  05/12/2004
Name:       POMPESTON CREEK, DELAWARE RIVER                   
            NJ
NOAA Chart: 12314                           Latitude:   40°  0.8' N (  40.01330)
USGS Quad:  FRANK FORD                      Longitude:  75°  0.5' W ( -75.00830)


                             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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