Superseded Bench Mark Sheet for 8531545, KEYPORT, RARITAN BAY NJ

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  5

                                                   PUBLICATION DATE:  07/22/1985
Station ID: 8531545                                SUPERCEDED DATE:   04/21/2003
Name:       KEYPORT, RARITAN BAY                              
            NEW JERSEY
NOAA Chart: 12327                                  Latitude:         40° 26.4' N
USGS Quad:  KEYPORT                                Longitude:        74° 11.9' W


To reach the tidal bench marks from State Highway 36 in the town of Keyport,
proceed north on Atlantic Street to First Street in the vicinity of Keyport
Yacht Club on the corner of First Street and Atlantic Street.  The tide gage and
staff were on the NE corner of the yacht club pier.  The bench marks are in the
vicinity of the yacht club, and at Chingarora Creek.


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


                 PRIMARY BENCH MARK STAMPING:  1545 A 1975

MONUMENTATION:           Survey Disk                               VM#:     2545
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Copper-clad Steel Rod


The bench mark is on the Keyport Yacht Club property, 67.4 feet (20.5 m) south
of the timber bulkhead along the bay, 20.1 feet (6.1 m) NE of SE corner of the
club's brick building, 13.2 feet (4.0 m) SE of the NE corner of the same
building, and 6.2 feet (1.9 m) SW of the NW corner of a concrete platform.  The
bench mark is 0.2 foot (0.1 m) below the ground, crimped to a copper-clad steel
rod driven 50 feet (15 m).



                         BENCH MARK STAMPING:  1545 B 1975

MONUMENTATION:           Survey Disk                               VM#:     2546
AGENCY:                                                            PID#:  AI8467
SETTING CLASSIFICATION:  Copper-clad Steel Rod


The bench mark is in a small park at the north end of Myrtle Avenue, 38.3 feet
(11.7 m) south of wood utility pole # JC 479 KPT, 12.4 feet (3.8 m) south of a
flagpole, 9.2 feet (2.8 m) south of the NW corner of a marble war moument, and
3.0 feet (0.9 m) east of the edge of a concrete curbing surrounding the
flagpole.  The bench mark is 0.2 foot (0.1 m) below the ground, crimped to a
copper-clad steel rod driven 42 feet (13 m) to refusal.

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

                                                   PUBLICATION DATE:  07/22/1985
Station ID: 8531545                                SUPERCEDED DATE:   04/21/2003
Name:       KEYPORT, RARITAN BAY                              
            NEW JERSEY
NOAA Chart: 12327                                  Latitude:         40° 26.4' N
USGS Quad:  KEYPORT                                Longitude:        74° 11.9' W


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


                         BENCH MARK STAMPING:  1545 C 1975

MONUMENTATION:           Survey Disk                               VM#:     2547
AGENCY:                                                            PID#:  AI8468
SETTING CLASSIFICATION:  Copper-clad Steel Rod


The bench mark is near the bridge over Chingarora Creek, 46.6 feet (14.2 m) SW
of the centerline of Walnut Street, 30.9 feet (9.4 m) NW of the centerline of
First Street, 28.2 feet (8.6 m) SW of a hydrant, 25.5 feet (7.8 m) NE of the SE
corner of the one-story brick building of Bridgeview Apartments, and 18.6 feet
(5.7 m) SE of a sewer manhole on the same property.  The bench mark is 0.2 foot
(0.1 m) below the ground, crimped to a copper-clad steel rod driven 40 feet (12
m) to refusal.



                         BENCH MARK STAMPING:  NO 2 1934

MONUMENTATION:           Survey Disk                               VM#:     2548
AGENCY:                                                            PID#:  KV0754
SETTING CLASSIFICATION:  Concrete Post


The bench mark is 0.1 mile (0.16 km) north along Myrtle Avenue from the
intersection of First Street and Myrtle Avenue, 42.0 feet (12.8 m) NE of a fire
hydrant, and 38.0 feet (11.6 m) ENE of power pole # 189 W.  The bench mark is
set in the top of a concrete post 0.1 foot (0.06 m) below the ground.



                         BENCH MARK STAMPING:  U 53 1961

MONUMENTATION:           Survey Disk                               VM#:     2549
AGENCY:                                                            PID#:  KV0756
SETTING CLASSIFICATION:  Retaining Wall


The bench mark is set in the west face of the SW corner of the Keyport Water
Works Pumping Station, 166 feet (51 m) WSW of Bench Mark NO 2 1934, 22 feet (7
m) north of the NE corner of a small brick building, and 4.5 feet (1.4 m) above
the ground.

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

                                                   PUBLICATION DATE:  07/22/1985
Station ID: 8531545                                SUPERCEDED DATE:   04/21/2003
Name:       KEYPORT, RARITAN BAY                              
            NEW JERSEY
NOAA Chart: 12327                                  Latitude:         40° 26.4' N
USGS Quad:  KEYPORT                                Longitude:        74° 11.9' W


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


                         BENCH MARK STAMPING:  P 36 1965

MONUMENTATION:           Survey Disk                               VM#:     2550
AGENCY:                                                            PID#:  KV0749
SETTING CLASSIFICATION:  Abutment of Bridge


The bench mark is set in top of the south end of the west abutment of a bridge
over Chingarora Creek, 49.5 feet (15.1 m) east of power pole # 100W, 15.4 feet
(4.7 m) south of the centerline of Stone Street, and 0.8 foot (0.2 m) west of
the east edge of the abutment.  (Note: use with caution).

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

                                                   PUBLICATION DATE:  07/22/1985
Station ID: 8531545                                SUPERCEDED DATE:   04/21/2003
Name:       KEYPORT, RARITAN BAY                              
            NEW JERSEY
NOAA Chart: 12327                                  Latitude:         40° 26.4' N
USGS Quad:  KEYPORT                                Longitude:        74° 11.9' W


                            T I D A L   D A T U M S 


Tidal datums at KEYPORT, RARITAN BAY based on:

     LENGTH OF SERIES:      9 MONTHS
     TIME PERIOD:           March - November 1976
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8531680 Sandy Hook


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

     HIGHEST OBSERVED WATER LEVEL (03/16/1976)         =   7.89
     MEAN HIGHER HIGH WATER                     MHHW   =   5.56
     MEAN HIGH WATER                            MHW    =   5.22
     MEAN TIDE LEVEL                            MTL    =   2.72
   * NATIONAL GEODETIC VERTICAL DATUM           NGVD29 =   1.99
     MEAN LOW WATER                             MLW    =   0.22
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (03/17/1976)         =  -3.24

   * NGVD reference based on adjustment of 1983 and NOS levels of 1976 - 1977. 
North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     1545 A 1975                                24.85      0.00
     1545 B 1975                                18.38      0.00
     1545 C 1975                                10.78      0.00
     NO 2 1934                                  20.41      0.00
     U 53 1961                                  20.52      0.00
     P 36 1965                                  12.34      0.00


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

                                                   PUBLICATION DATE:  07/22/1985
Station ID: 8531545                                SUPERCEDED DATE:   04/21/2003
Name:       KEYPORT, RARITAN BAY                              
            NEW JERSEY
NOAA Chart: 12327                                  Latitude:         40° 26.4' N
USGS Quad:  KEYPORT                                Longitude:        74° 11.9' W


                             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 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 8531545 KEYPORT, RARITAN BAY, NJ