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Bench Mark Sheet for 8512987, Northville NY

Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8512987                         PUBLICATION DATE:  02/05/2004
Name:       NORTHVILLE FUEL DOCK, LONG ISLAND                 
            NY
NOAA Chart: 12358                           Latitude:   40° 58.9' N (  40.98170)
USGS Quad:  RIVERHEAD                       Longitude:  72° 38.7' W ( -72.64500)


To reach the tidal bench marks from State Highway 25 in River-head, proceed east
on State Highway 25 for 2.6 km (1.6 mi) to a stoplight, turn left onto Route
105-N and go 2.6 km (1.6 mi) to Route 43-E, turn right onto Route 43-E and go
0.8 km (0.5 mi) to Sound Road, turn right onto Sound Road and go 0.2 km (0.1 mi)
to Pennys Road, turn left onto Pennys Road and follow the curvy road for 2.6 km
(1.6 mi) to Northville Industries Corporations Riverhead Terminal.  The bench
marks are along the beach on the north side of the property.  The tide gauge was
on the fuel loading pier on the north side of the property.


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


                 PRIMARY BENCH MARK STAMPING:  2987 A 1987
                         DESIGNATION:          851 2987 A

MONUMENTATION:           Tidal Station disk                    VM#:         7409
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete cell                         OPUS PID:        
LATITUDE:   40° 58.9' N (  40.98170)          LONGITUDE:  72° 38.7' W ( -72.64500)


The primary bench mark is a disk set flush on the first concrete cell from the
shore on the fuel loading pier, 4 m (13 ft) NW of the NW corner of a wood-framed
safety shack, 2.04 m (6.7 ft) south of the western bollard on the cell, and 0.46
m (1.5 ft) east of the west face of the cell.

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

                                                                                
Station ID: 8512987                         PUBLICATION DATE:  02/05/2004
Name:       NORTHVILLE FUEL DOCK, LONG ISLAND                 
            NY
NOAA Chart: 12358                           Latitude:   40° 58.9' N (  40.98170)
USGS Quad:  RIVERHEAD                       Longitude:  72° 38.7' W ( -72.64500)


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


                         BENCH MARK STAMPING:  2987 B 1987
                         DESIGNATION:          851 2987 B

MONUMENTATION:           Tidal Station disk                    VM#:         7410
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete pad                          OPUS PID#: BBDC16
LATITUDE:   40° 58.9' N (  40.98170)          LONGITUDE:  72° 38.7' W ( -72.64500)


The bench mark is a disk set flush in a concrete pad at the foot of the fuel
loading pier, 13.66 m (44.8 ft) south of the south end of the steel pier, 10 m
(33 ft) north of a wood retaining wall at the foot of a hill, 3.26 m (10.7 ft)
SW of the SW corner of a 3 m x 2 m (10 ft x 8 ft) concrete building at the base
of the pier, 0.52 m (1.7 ft) east of a 0.30 m (1.0 ft) diameter gas pipeline
running along the west side of the pier, and 0.76 m (2.5 ft) feet below road
level.



                         BENCH MARK STAMPING:  2987 F 1999
                         DESIGNATION:          851 2987 F

MONUMENTATION:           Tidal Station disk                    VM#:        15968
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Retaining wall                        OPUS PID:        
LATITUDE:   40° 58.9' N (  40.98170)          LONGITUDE:  72° 38.7' W ( -72.64500)


The bench mark is a disk set in the retaining wall of a pump station, 10.38 m
(34.1 ft) north of the south corner of the pipeline retaining wall pit, 6.50 m
(21.3 ft) south of the bulkhead, and 4.82 m (15.8 ft) west of the steps leading
over the pipeline.

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

                                                                                
Station ID: 8512987                         PUBLICATION DATE:  02/05/2004
Name:       NORTHVILLE FUEL DOCK, LONG ISLAND                 
            NY
NOAA Chart: 12358                           Latitude:   40° 58.9' N (  40.98170)
USGS Quad:  RIVERHEAD                       Longitude:  72° 38.7' W ( -72.64500)


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


                         BENCH MARK STAMPING:  2987 G 1999
                         DESIGNATION:          851 2987 G

MONUMENTATION:           Tidal Station disk                    VM#:        15969
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Retaining wall                        OPUS PID:        
LATITUDE:   40° 58.9' N (  40.98170)          LONGITUDE:  72° 38.7' W ( -72.64500)


The bench mark is a disk set in the concrete retaining wall of a pipeline
switching station, 15.02 m (49.3 ft) east of the west end of the retaining wall,
3.07 m (10.1 ft) north of the SW corner of the pipeline switching station
building, and 0.32 m (1.0 ft) west of the east face of the building.



                         BENCH MARK STAMPING:  2987 H 1999
                         DESIGNATION:          851 2987 H

MONUMENTATION:           Tidal Station disk                    VM#:        15970
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Retaining wall                        OPUS PID:        
LATITUDE:   40° 58.9' N (  40.98170)          LONGITUDE:  72° 38.7' W ( -72.64500)


The bench mark is a disk set in the concrete curb of the pipeline retaining bin,
26.30 m (86.3 ft) east of the most easterly steps leading over the pipeline,
10.16 m (33.3 ft) NNW of the NE corner of the pipeline pump house, and 7.52 m
(24.7 ft) SW of the NE corner of the bulkhead.

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

                                                                                
Station ID: 8512987                         PUBLICATION DATE:  02/05/2004
Name:       NORTHVILLE FUEL DOCK, LONG ISLAND                 
            NY
NOAA Chart: 12358                           Latitude:   40° 58.9' N (  40.98170)
USGS Quad:  RIVERHEAD                       Longitude:  72° 38.7' W ( -72.64500)


                            T I D A L   D A T U M S 


Tidal datums at NORTHVILLE FUEL DOCK, LONG ISLAND based on:

     LENGTH OF SERIES:      1 YEAR
     TIME PERIOD:           September 1999 - August 2000
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8467150 BRIDGEPORT, BRIDGEPORT HARBOR


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

     HIGHEST OBSERVED WATER LEVEL (10/22/1988)         =  2.650
     MEAN HIGHER HIGH WATER                     MHHW   =  1.792
     MEAN HIGH WATER                            MHW    =  1.698
     MEAN TIDE LEVEL                            MTL    =  0.882
     MEAN SEA LEVEL                             MSL    =  0.878
     MEAN LOW WATER                             MLW    =  0.066
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (02/09/1989)         = -0.642

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     2987 A 1987                                 4.201    2.503
     2987 B 1987                                 4.415    2.717
     2987 F 1999                                 6.422    4.724
     2987 G 1999                                 8.103    6.405
     2987 H 1999                                 6.227    4.529


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

                                                                                
Station ID: 8512987                         PUBLICATION DATE:  02/05/2004
Name:       NORTHVILLE FUEL DOCK, LONG ISLAND                 
            NY
NOAA Chart: 12358                           Latitude:   40° 58.9' N (  40.98170)
USGS Quad:  RIVERHEAD                       Longitude:  72° 38.7' W ( -72.64500)


                             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 8512987 Northville, NY

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