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Bench Mark Sheet for 8444525, Nut Island MA

Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8444525                         PUBLICATION DATE:  04/21/2003
Name:       NUT ISLAND, QUINCY BAY                            
            MA
NOAA Chart: 13270                           Latitude:   42° 16.8' N (  42.28000)
USGS Quad:  HULL                            Longitude:  70° 57.2' W ( -70.95330)


To reach the tidal bench marks from I-93 South in Boston, take Exit 12 to Route
3A South and bear left to the Squantum/Wollaston Beach exit and Sea Street, then
go 5.0 km (3.1 mi) to the entrance of the Nut Island Headworks facility. The
bench marks are on the property of the headworks facility. The tide gage was
located on the inshore end of the concrete pier.


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


                 PRIMARY BENCH MARK STAMPING:  NI 8
                         DESIGNATION:          844 4525 NI 8

MONUMENTATION:           Survey disk                           VM#:        16249
AGENCY:                  Massachusetts Geodetic Survey (MGS)   IDB PID#:        
SETTING CLASSIFICATION:  Concrete pier                         OPUS PID:        
LATITUDE:   42° 16.9' N (  42.28170)          LONGITUDE:  70° 57.2' W ( -70.95330)


The primary bench mark is a disk set flush in the concrete cap on the east side
of the Nut Island headworks pier, 25.02 m (82.1 ft) south of the north end of
the pier, 6.49 m (21.3 ft) north of the center of a bollard, 3.41 m (11.2 ft)
east of the center of the pier, and 1.07 m (3.5 ft) west of the east edge.

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

                                                                                
Station ID: 8444525                         PUBLICATION DATE:  04/21/2003
Name:       NUT ISLAND, QUINCY BAY                            
            MA
NOAA Chart: 13270                           Latitude:   42° 16.8' N (  42.28000)
USGS Quad:  HULL                            Longitude:  70° 57.2' W ( -70.95330)


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


                         BENCH MARK STAMPING:  4525 A 2000
                         DESIGNATION:          844 4525 A

MONUMENTATION:           Tidal Station disk                    VM#:        16250
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete pier                         OPUS PID:        
LATITUDE:   42° 16.9' N (  42.28170)          LONGITUDE:  70° 57.2' W ( -70.95330)


The bench mark is a disk set flush in the concrete cap on the east side of the
Nut Island headworks pier, 24.81 m (81.4 ft) NW of the second light pole on the
east side of the pier, 9.63 m (31.6 ft) NE of the first light pole on the pier,
4.11 m (13.5 ft) south of the center of the pier, and 0.46 m (1.5 ft) west of
the east edge of the pier.



                         BENCH MARK STAMPING:  4525 B 2000
                         DESIGNATION:          844 4525 B

MONUMENTATION:           Tidal Station disk                    VM#:        16251
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete well cap                     OPUS PID:        
LATITUDE:   42° 16.8' N (  42.28000)          LONGITUDE:  70° 57.2' W ( -70.95330)


The bench mark is a disk set in a concrete well cap with four goose necked vent
pipes on the NE side of the facility building, 25.79 m (84.6 ft) NNE of the SE
corner of a chainlink fence around a parking lot, 25.51 m (83.7 ft) SSE of the
centerline of the road leading to the pier, 11.80 m (38.7 ft) SE of the NE
corner of the fence, 8.41 m (27.6 ft) east of the side of the fence, and 0.40 m
(1.3 ft) above the ground.

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

                                                                                
Station ID: 8444525                         PUBLICATION DATE:  04/21/2003
Name:       NUT ISLAND, QUINCY BAY                            
            MA
NOAA Chart: 13270                           Latitude:   42° 16.8' N (  42.28000)
USGS Quad:  HULL                            Longitude:  70° 57.2' W ( -70.95330)


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


                         BENCH MARK STAMPING:  4525 C 2000
                         DESIGNATION:          844 4525 C

MONUMENTATION:           Tidal Station disk                    VM#:        16252
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete pad                          OPUS PID:        
LATITUDE:   42° 16.7' N (  42.27830)          LONGITUDE:  70° 57.3' W ( -70.95500)


The bench mark is a disk set in the NW corner of a 3.00 m (9.8 ft) x 4.30 m
(14.1 ft) concrete pad with steel doors and a 0.95 m (3.1 ft) x 0.95 m (3.1 ft)
stainless vent, on the NW side of the facility building and near the bike path,
44.50 m (146.0 ft) NE of a stainless vent, 20.20 m (66.3 ft) NNW of the westerly
of two flagpoles in front of the building, 3.60 m (11.8 ft) ESE of a asphalt
bike path, and at ground level.



                         BENCH MARK STAMPING:  4525 D 2000
                         DESIGNATION:          844 4525 D

MONUMENTATION:           Tidal Station disk                    VM#:        16253
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete pad                          OPUS PID:        
LATITUDE:   42° 16.8' N (  42.28000)          LONGITUDE:  70° 57.2' W ( -70.95330)


The bench mark is a disk set flush in a concrete pad for a 4 ft (1 m) square
stainless steel vent, on the north side of the property on a small hill, 137 m
(450 ft) NWof the facility building, 36.55 m (119.9 ft) NNW of an asphalt
jogging trail, 20.00 m (65.6 ft) east of a jogging trail, and 4.60 m (15.1 ft)
west of a concrete and steel vent.

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

                                                                                
Station ID: 8444525                         PUBLICATION DATE:  04/21/2003
Name:       NUT ISLAND, QUINCY BAY                            
            MA
NOAA Chart: 13270                           Latitude:   42° 16.8' N (  42.28000)
USGS Quad:  HULL                            Longitude:  70° 57.2' W ( -70.95330)


                            T I D A L   D A T U M S 


Tidal datums at NUT ISLAND, QUINCY BAY based on:

     LENGTH OF SERIES:      14 Months
     TIME PERIOD:           September 2000 - October 2001
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8443970 BOSTON, BOSTON HARBOR


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

     HIGHEST OBSERVED WATER LEVEL (03/06/2001)         =  3.973
     MEAN HIGHER HIGH WATER                     MHHW   =  3.113
     MEAN HIGH WATER                            MHW    =  2.976
     MEAN SEA LEVEL                             MSL    =  1.574
     MEAN TIDE LEVEL                            MTL    =  1.540
     MEAN LOW WATER                             MLW    =  0.104
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (02/11/2001)         = -0.954

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     NI 8                                        5.448    2.472
     4525 A 2000                                 5.450    2.474
     4525 B 2000                                10.843    7.867
     4525 C 2000                                 9.122    6.146
     4525 D 2000                                10.408    7.432


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

                                                                                
Station ID: 8444525                         PUBLICATION DATE:  04/21/2003
Name:       NUT ISLAND, QUINCY BAY                            
            MA
NOAA Chart: 13270                           Latitude:   42° 16.8' N (  42.28000)
USGS Quad:  HULL                            Longitude:  70° 57.2' W ( -70.95330)


                             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 8444525 Nut Island, MA

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