Bench Mark Sheet for 8512451, PONQUOGUE POINT 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  7

                                                                                
Station ID: 8512451                         PUBLICATION DATE:  09/27/2017
Name:       PONQUOGUE POINT, SHINNECOCK BAY                   
            NY
NOAA Chart: 12353                           Latitude:   40° 51.0' N (  40.85000)
USGS Quad:  QUOGUE                          Longitude:  72° 30.2' W ( -72.50330)


To reach the tidal bench marks by car from the intersection of Montauk Highway
and Ponquogue Avenue in Hampton Bays, proceed south on Ponquogue Avenue 2.4 km
(1.5 mi) to the  T  intersection with Shinnecock Road, turn left onto Shinnecock
Road and proceed east 0.8 km (0.5 mi) to the intersection with Foster Avenue,
turn right onto Foster Avenue and proceed south 0.6 km (0.4 mi) to the entrance
gate on the left for the United States Coast Guard Station Shinnecock.  The tide
gauge is located on the north side of the USCG boat basin and the bench marks
are on the USCG grounds and south along the old Ponquogue Bridge alignment.


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


                 PRIMARY BENCH MARK STAMPING:  2451 A 1989
                         DESIGNATION:          851 2451 A

MONUMENTATION:           Bench Mark disk                       VM#:         7439
AGENCY:                  National Ocean Survey/Service (NOS)   IDB PID#:        
SETTING CLASSIFICATION:  Concrete base                         OPUS PID:        
LATITUDE:   40° 51.0' N (  40.84958)          LONGITUDE:  72° 30.2' W ( -72.50356)


The primary bench mark is a disk set in concrete pad of the United States Coast
Guard Shinnecock Station flagpole, 37.83 m (124.1 ft) N of the NW corner of main
USCG building, 37.15 m (121.9 ft) W of the boat basin bulkhead, 9.02 m (29.6 ft)
S of the mounted bell embossed  Gregory Cannon Street New York 1890. , and 7.70
m (25.3 ft) E of the E edge of pavement of the entrance road leading to the main
USCG building.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  7

                                                                                
Station ID: 8512451                         PUBLICATION DATE:  09/27/2017
Name:       PONQUOGUE POINT, SHINNECOCK BAY                   
            NY
NOAA Chart: 12353                           Latitude:   40° 51.0' N (  40.85000)
USGS Quad:  QUOGUE                          Longitude:  72° 30.2' W ( -72.50330)


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


                         BENCH MARK STAMPING:  NO 3 1933 RESET 1943
                         DESIGNATION:          TIDAL 3 STA II 55 RESET

MONUMENTATION:           Bench Mark disk                       VM#:         7436
AGENCY:                  United States Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  KU0419
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   40° 50.8' N (  40.84725)          LONGITUDE:  72° 30.1' W ( -72.50231)


The bench mark is a disk set in a concrete monument S of the United States Coast
Guard Shinnecock station and along the W side of the road to the old Ponquogoe
Bridge alignment, 64.85 m (212.8 ft) SSW of the SW corner of the USCG chain link
fence where it turns E towards the water, 24.65 m (80.9 ft) NE of power pole
#26, 9.01 m (29.6 ft) SSW of a hinged gate post blocking vehicle access, 3.11 m
(10.2 ft) SSE of power pole #27, and 6 cm (0.2 ft) below the pavement.



                         BENCH MARK STAMPING:  W 320 1943
                         DESIGNATION:          851 2451 W 320 1943

MONUMENTATION:           Survey disk                           VM#:         7437
AGENCY:                  National Ocean Survey/Service (NOS)   IDB PID#:  KU0415
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   40° 51.0' N (  40.85000)          LONGITUDE:  72° 30.2' W ( -72.50331)


The bench mark is a disk set in a concrete monument in the NE quarter of the
intersection of Ponquogue and Bay Avenues, 2.3 km (1.4 mi) SE along Ponquogue
Avenue from the Post Office at Hampton Bays, 18 m (58 ft) north of the
centerline of Bay Avenue, 10 m (33 ft) east of the centerline of Ponquogue
Avenue, 3 m (11 ft) SE of NYT power pole #16 S, and 0.1 m (0.3 ft).

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  7

                                                                                
Station ID: 8512451                         PUBLICATION DATE:  09/27/2017
Name:       PONQUOGUE POINT, SHINNECOCK BAY                   
            NY
NOAA Chart: 12353                           Latitude:   40° 51.0' N (  40.85000)
USGS Quad:  QUOGUE                          Longitude:  72° 30.2' W ( -72.50330)


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


                         BENCH MARK STAMPING:  PONQ NO 1 1965
                         DESIGNATION:          851 2451 PONQ NO 1 1965

MONUMENTATION:           Reference Mark disk                   VM#:         7438
AGENCY:                  United States Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AE4707
SETTING CLASSIFICATION:  Concrete pad                          OPUS PID:        
LATITUDE:   40° 50.9' N (  40.84892)          LONGITUDE:  72° 30.2' W ( -72.50297)


The bench mark is a disk set in the concrete pad near the SW corner of the boat
basin at the US Coast Guard Shinnecock station, 34.79 m (114.1 ft) SE of the SE
corner of the one story addition on the S side of the USCG main building, 3.67 m
(12.0 ft) N of the S edge of the concrete pad, and 0.56 m (1.8 ft) E of the W
edge of the concrete pad.



                         BENCH MARK STAMPING:  2451 B 1989
                         DESIGNATION:          851 2451 B 1989

MONUMENTATION:           Survey disk                           VM#:         7440
AGENCY:                  National Ocean Survey/Service (NOS)   IDB PID#:        
SETTING CLASSIFICATION:  Concrete foundation                   OPUS PID:        
LATITUDE:   40° 51.0' N (  40.85000)          LONGITUDE:  72° 30.2' W ( -72.50331)


The bench mark is a disk set flush in the concrete foundation of the Coast Guard
boat house, 18.56 m (60.9 ft) SSW of the bulkhead, 5.73 m (18.8 ft) ESE of the
NW corner of the building, and 0.21 m (0.7 ft) ESE of the NW edge of the
westernmost garage-type door along the north side of the building.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  7

                                                                                
Station ID: 8512451                         PUBLICATION DATE:  09/27/2017
Name:       PONQUOGUE POINT, SHINNECOCK BAY                   
            NY
NOAA Chart: 12353                           Latitude:   40° 51.0' N (  40.85000)
USGS Quad:  QUOGUE                          Longitude:  72° 30.2' W ( -72.50330)


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


                         BENCH MARK STAMPING:  2451 C 1989
                         DESIGNATION:          851 2451 C

MONUMENTATION:           Bench Mark disk                       VM#:         7441
AGENCY:                  National Ocean Survey/Service (NOS)   IDB PID#:        
SETTING CLASSIFICATION:  Concrete footing                      OPUS PID#: BBDG82
LATITUDE:   40° 51.0' N (  40.85072)          LONGITUDE:  72° 30.3' W ( -72.50425)


The bench mark is a disk set in a 0.58 m (1.9 ft) by 0.61 m (2.0 ft) concrete
footing for an antenna tower that has been removed on the N side of the United
States Coast Guard Shinnecock Station grounds, 59.45 m (195.0 ft) NW of the NW
corner of the USCG boathouse, 37.02 m (121.5 ft) E of the W most power pole
inside the N fence of the USCG grounds, 19.23 m (63.1 ft) W of the SW corner of
a small brick building W of the basketball court and N of the softball field,
and 10.87 m (35.7 ft) WSW of the second power pole E along the N fence.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  7

                                                                                
Station ID: 8512451                         PUBLICATION DATE:  09/27/2017
Name:       PONQUOGUE POINT, SHINNECOCK BAY                   
            NY
NOAA Chart: 12353                           Latitude:   40° 51.0' N (  40.85000)
USGS Quad:  QUOGUE                          Longitude:  72° 30.2' W ( -72.50330)


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


                         BENCH MARK STAMPING:  USCG NY2 2013
                         DESIGNATION:          USCG NY2

MONUMENTATION:           Bench Mark disk                       VM#:        20912
AGENCY:                  USCG                                  IDB PID#:        
SETTING CLASSIFICATION:  Concrete pad                          OPUS PID:        
LATITUDE:   40° 51.0' N (  40.85047)          LONGITUDE:  72° 30.2' W ( -72.50342)


The bench mark is a disk set in a concrete pad on the N side of the United
States Coast Guard Shinnecock Station grounds, 25.70 m (84.3 ft) ENE of NW
corner of the USCG boathouse, 25.42 m (83.4 ft) SSE of the NW inside corner of
the boat basin bulkhead, 11.85 m (38.9 ft) N of the E side of the E most
overhead garage door on the N side of the USCG boathouse, 0.85 m (2.8 ft) N of
the S edge of the concrete pad, and 0.42 m (1.4 ft) W of the E edge of the
concrete pad.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  7

                                                                                
Station ID: 8512451                         PUBLICATION DATE:  09/27/2017
Name:       PONQUOGUE POINT, SHINNECOCK BAY                   
            NY
NOAA Chart: 12353                           Latitude:   40° 51.0' N (  40.85000)
USGS Quad:  QUOGUE                          Longitude:  72° 30.2' W ( -72.50330)


                            T I D A L   D A T U M S 


Tidal datums at PONQUOGUE POINT, SHINNECOCK BAY based on:

     LENGTH OF SERIES:      1 YEAR
     TIME PERIOD:           July 1989 - June 1990
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8510560 MONTAUK, FORT POND BAY


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

     HIGHEST OBSERVED WATER LEVEL (01/03/2014)         =  1.699
     MEAN HIGHER HIGH WATER                     MHHW   =  0.970
     MEAN HIGH WATER                            MHW    =  0.892
     North American Vertical Datum              NAVD88 =  0.554
     MEAN TIDE LEVEL                            MTL    =  0.465
     MEAN SEA LEVEL                             MSL    =  0.463
     MEAN LOW WATER                             MLW    =  0.039
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (11/12/1990)         = -0.530

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     2451 A 1989                                 2.917    2.025
     NO 3 1933 RESET 1943                        1.676    0.784
     W 320 1943                                  7.282    6.390
     PONQ NO 1 1965                              2.227    1.335
     2451 B 1989                                 2.494    1.601
     2451 C 1989                                 2.793    1.901
     USCG NY2 2013                               2.207    1.315


Foot Notes:

Bench mark W 320 1943 is based on one differential leveling connection and do
not meet the quality control standards of the NOS. Therefore, caution should be
used when deriving elevations for this mark.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  7

                                                                                
Station ID: 8512451                         PUBLICATION DATE:  09/27/2017
Name:       PONQUOGUE POINT, SHINNECOCK BAY                   
            NY
NOAA Chart: 12353                           Latitude:   40° 51.0' N (  40.85000)
USGS Quad:  QUOGUE                          Longitude:  72° 30.2' W ( -72.50330)


                             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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