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Details for Benchmark: AA7161

N 42° 14.330 W 070° 47.345 (NAD 83)

Altitude: 9

Coordinates may not be exact. Altitude is VERTCON and location is ADJUSTED. (more info)

Location:
In PLYMOUTH county, MA View Original Datasheet
Designation:
GOVT
Marker Type:
survey disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

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A small circle of grass around the benchmark is cleared out, so it's easy to see if you walk from the plaque towards the water. Also, there are lovely views of the harbor! :)

[Photos:]
photoClose view
photoBenchmark with background objects

The grass is crowding in but the center is still visible.
edexter

[Photos:]
photoMark in setting next to GPSr
photoGOVT 1994
photoMark and GPSr: cords match well
photoCoin with the mark and GPSr

Easily found in the lawn at Minot's Ledge Lighthouse park.

[Photos:]
photoView from the benchmark disc
It was a little too dark to get a good picture of the disc. But, here is what it looks like from the area at dusk.

RECOVERED IN GOOD CONDITION.

[Photos:]
photoPhoto

Recovered in good condition, as described.

[Photos:]
photoDisk and Benchmark Buddha, Cohasset MA
N 42° 14.332 W 070° 47.346

And to think I grew up running around that exact location. As everyday at our harbor, the weather was gorgeous. Now I have just another summer day memory at my favorite place in the world! der & kelly

[Photos:]
photoPicture of AA7161 Benchmark!
Here's a picture of the benchmark located at Government's Island in Cohasset Harbor!
photoGood Job Daisy!
Brought along my trusty dog to help take the picture. Aww..she found it! Nice work Daisy-doo!

Documented History (by the NGS)

01/01/1994 by NOS (MONUMENTED)
DESCRIBED BY NATIONAL OCEAN SERVICE 1994 (RPB) THE STATION IS LOCATED .8 MI (1.3 KM) EAST FROM DOWNTOWN COHASSET, MA IN A SMALL PARK ON GOVERMENT ISLAND. TO REACH THE STATION FROM STATE HIGHWAY 3 AND STATE ROAD 228 HEAD NORTH ON STATE ROAD 228 FOR 6.0 MI (9.7 KM) TO WHERE IT MEETS STATE ROAD 3A, TURN RIGHT ON STATE ROAD 3A AND HEAD EAST FOR 3.0 MI (4.8 KM) TO POND STREET, TURN LEFT ON POND STREET AND HEAD NORTH FOR 0.7 MI (1.1 KM) TO STOP SIGN AT CUSHING STREET, TURN RIGHT ON CUSHING STREET FOR 0.5 MI (0.8 KM) INTO COHASSET VILLAGE AND BEAR RIGHT FOR ANOTHER 0.4 MI (0.6 KM) OVER BRIDGE AND TAKE AN IMMEDIATE LEFT AND PROCEED STRAIGHT AHEAD TO A SMALL PARK. THE STATION IS 78.0 FT (23.8 M) NORTHWEST OF THE NORTHWEST CORNER OF THE SQUARE BASE OF A REPLICA OF THE MINOT''S LEDGE LIGHTHOUSE, 37.0 FT (11.3 M) NORTH OF A LARGE ROCK WITH PLAQUES COMMERATING THE MINOT''S LEDGE LIGHTHOUSE AND 25.0 FT (7.6 M) SOUTH OF A SEAWALL BORDERING COHASSET COVE.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in June 1998.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
  • The X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • The geoid height was determined by GEOID99.

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