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Bench Mark Sheet for 8511629, Sag Harbor 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  6

                                                                                
Station ID: 8511629                         PUBLICATION DATE:  11/06/2014
Name:       SAG HARBOR, SHELTER IS. SOUND                     
            NY
NOAA Chart: 12358                           Latitude:   41°  0.2' N (  41.00330)
USGS Quad:  GREENPORT                       Longitude:  72° 17.8' W ( -72.29670)


To reach the bench marks from the sag harbor post office on long island avenue,
proceed east 0.1 km (0.05 mi) on long island avenue to main street, turn left
and proceed north 0.02 km (0.01 mi) on main street to the intersection with bay
street, turn right and proceed se 0.1 km (0.07 mi) on bay street to the
intersection with marine park drive, turn left and proceed north 0.05 km (0.03
mi) on marine park drive to the bulkhead.  The bench marks are along the
waterfront, main street and hampton street.  The tide gauge is located at the nw
corner of the bulkhead in marine park.


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


                 PRIMARY BENCH MARK STAMPING:  1629 A 2014
                         DESIGNATION:          851 1629 A

MONUMENTATION:           Flange-encased Rod                    VM#:        21016
AGENCY:                  National Ocean Service                IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod in sleeve         OPUS PID:        
LATITUDE:   41°  0.2' N (  41.00256)          LONGITUDE:  72° 17.7' W ( -72.29439)


The primary bench mark is a flange encased rod set in the grass strip along the
waterfront, 20.88 m (68.5 ft) ESE  of the E wall of the waterfront marina
building, 15.13 m (49.6 ft) NNE  of an unnumbered power pole with a no parking
sign, 8.70 m (28.5 ft) S of a tree growing out of a stone seawall, 3.82 m (12.5
ft) SSW  of the wood railing along the wood boardwalk on top of the bulkhead,
and 2.16 m (7.1 ft) SW of the W most decorative light pole. The bench mark is
set 7 cm (3 in) below grade being the top of a stainless steel rod driven 28.0 m
(92.0 ft) to substantial resistance and enchased in a 5-inch pvc pipe with
concrete kickblock and NOS logo cap.

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

                                                                                
Station ID: 8511629                         PUBLICATION DATE:  11/06/2014
Name:       SAG HARBOR, SHELTER IS. SOUND                     
            NY
NOAA Chart: 12358                           Latitude:   41°  0.2' N (  41.00330)
USGS Quad:  GREENPORT                       Longitude:  72° 17.8' W ( -72.29670)


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


                         BENCH MARK STAMPING:  1629 B 2014
                         DESIGNATION:          851 1629 B

MONUMENTATION:           Flange-encased Rod                    VM#:        21017
AGENCY:                  National Ocean Service                IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod in sleeve         OPUS PID#: BBDL98
LATITUDE:   41°  0.1' N (  41.00200)          LONGITUDE:  72° 17.5' W ( -72.29239)


The bench mark is a flange encased rod set in the grass strip along the
waterfront, 6.24 m (20.5 ft) S of an electric pedestal for boat shore power on
the N side of the bulkhead, 5.08 m (16.7 ft) SSW of the NE side of the bulkhead,
3.97 m (13.0 ft) NE of the SW side of the bulkhead, 3.07 m (10.1 ft) SE of the E
most decorative light post and 2.40 m (7.9 ft) WNW of the E end of the bulkhead
and the entrance to the harbor. The bench mark is set 8 cm (3 in) below grade
being the top of a stainless steel rod driven 28.0 m (92.0 ft) to substantial
resistance and encased in a 5-inch pvc pipe with concrete kickblock and NOS logo
cap.



                         BENCH MARK STAMPING:  1629 C 2014
                         DESIGNATION:          851 1629 C

MONUMENTATION:           Bench Mark disk                       VM#:        21018
AGENCY:                  National Ocean Service                IDB PID#:        
SETTING CLASSIFICATION:  Concrete tank wall                    OPUS PID:        
LATITUDE:   41°  0.1' N (  41.00194)          LONGITUDE:  72° 17.5' W ( -72.29136)


The bench mark is a disk set in the UV treatment concrete tank wall, 6.92 m
(22.7 ft) ESE  of the NE corner of the brick building, 6.37 m (20.9 ft) S of the
fence along water on the N side of the property, 4.56 m (15.0 ft) W of the N
corner on the E side of the tank, 1.30 m (4.3 ft) S of the NW corner of the
tank, 0.25 m (0.8 ft) N of the metal railing on top of the tank and 0.61 m (2.0
ft) above grade.

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

                                                                                
Station ID: 8511629                         PUBLICATION DATE:  11/06/2014
Name:       SAG HARBOR, SHELTER IS. SOUND                     
            NY
NOAA Chart: 12358                           Latitude:   41°  0.2' N (  41.00330)
USGS Quad:  GREENPORT                       Longitude:  72° 17.8' W ( -72.29670)


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


                         BENCH MARK STAMPING:  TIDAL 1 RESET 1983
                         DESIGNATION:          851 1629 TIDAL 1 RESET

MONUMENTATION:           Bench Mark disk                       VM#:        21019
AGENCY:                  National Geodetic Survey              IDB PID#:  LX7648
SETTING CLASSIFICATION:  Concrete slab                         OPUS PID:        
LATITUDE:   41°  0.1' N (  41.00186)          LONGITUDE:  72° 17.7' W ( -72.29542)


The bench mark is a disk set in the concrete slab for the air conditioning unit,
22.53 m (73.9 ft) ESE of the SW corner of the provisions natural foods building,
14.52 m (47.6 ft) ENE of a power pole with metal tag 6s, 10.45 m (34.3 ft) S of
a storm drain manhole cover, 8.18 m (26.8 ft) WSW of the NE corner of the
building and 1.16 m (3.8 ft) N of the NW corner of the building.

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

                                                                                
Station ID: 8511629                         PUBLICATION DATE:  11/06/2014
Name:       SAG HARBOR, SHELTER IS. SOUND                     
            NY
NOAA Chart: 12358                           Latitude:   41°  0.2' N (  41.00330)
USGS Quad:  GREENPORT                       Longitude:  72° 17.8' W ( -72.29670)


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


                         BENCH MARK STAMPING:  U 335 1950
                         DESIGNATION:          U 335

MONUMENTATION:           Bench Mark disk                       VM#:        21020
AGENCY:                  US Coast and Geodetic Survey          IDB PID#:  KU0112
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   40° 59.7' N (  40.99500)          LONGITUDE:  72° 16.8' W ( -72.28072)


The bench mark is a disk set in a concrete monument slightly W of the NW corner
of the intersection, 13.97 m (45.8 ft) WNW of the Centerline of Hempstead
street, 9.36 m (30.7 ft) NNE of the Centerline of Hampton street, 5.55 m (18.2
ft) E of a power pole with metal Tag 30, 4.08 m (13.4 ft) NW of a fire hydrant
and 1.95 m (6.4 ft) E of a 0.45 m (1.5 ft) diameter tree.

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

                                                                                
Station ID: 8511629                         PUBLICATION DATE:  11/06/2014
Name:       SAG HARBOR, SHELTER IS. SOUND                     
            NY
NOAA Chart: 12358                           Latitude:   41°  0.2' N (  41.00330)
USGS Quad:  GREENPORT                       Longitude:  72° 17.8' W ( -72.29670)


                            T I D A L   D A T U M S 


Tidal datums at SAG HARBOR, SHELTER IS. SOUND based on:

     LENGTH OF SERIES:      3 MONTHS
     TIME PERIOD:           May 2014 - July 2014
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8461490 NEW LONDON, THAMES RIVER


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.872
     MEAN HIGH WATER                            MHW    =  0.785
     North American Vertical Datum              NAVD88 =  0.533
     MEAN SEA LEVEL                             MSL    =  0.435
     MEAN TIDE LEVEL                            MTL    =  0.418
     MEAN LOW WATER                             MLW    =  0.051
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     1629 A 2014                                 2.592    1.807
     1629 B 2014                                 1.890    1.105
     1629 C 2014                                 3.410    2.625
     TIDAL 1 RESET 1983                          3.893    3.108
     U 335 1950                                 16.532   15.747


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

                                                                                
Station ID: 8511629                         PUBLICATION DATE:  11/06/2014
Name:       SAG HARBOR, SHELTER IS. SOUND                     
            NY
NOAA Chart: 12358                           Latitude:   41°  0.2' N (  41.00330)
USGS Quad:  GREENPORT                       Longitude:  72° 17.8' W ( -72.29670)


                             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 8511629 Sag Harbor, NY

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