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Details for Benchmark: MZ0044

N 42° 41.550 W 072° 02.933 (NAD 83)

Altitude: 1027.79

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

Location:
In WORCESTER county, MA View Original Datasheet
Designation:
W 7
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Recovered in good condition. Took me 2 tries. Coords are off a bit.
42*41.551N & 072*02.942W worked for me within a few feet.

I found this one it took me more time than i wanted.It took me about a 1/2 hour to find it over grown and junk from the old factory fire of 1978..

Recovered in good condition.

[Photos:]
photoMZ0044_W 7

This one took a little while to find. The factories listed are long since gone and the rail bed is very overgrown. In addition to the above description, there is a small brook that runs along side of the rail bed, the BM is about 4 yards west of the brook and about 5 feet higher than the existing railroad ties. Most of the rock ledge described is covered over with brush and moss so it doesnt really stand out. I looked for this one for about 20 minutes or so.

[Photos:]
photoDisk with GPS

Documented History (by the NGS)

01/01/1933 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1933 AT WINCHENDON. ABOUT 2,530 FEET NORTH ALONG THE BOSTON AND MAINE RAILROAD FROM THE STATION AT WINCHENDON, WORCESTER COUNTY, BETWEEN THE CONVERSE MASON FACTORY AND THE STANDARD OIL CO. PLANT, ABOUT 8 YARDS SOUTH OF THE CENTER LINE OF THE TRACK, 25 FEET NORTH OF THE NORTH FENCE OF THE STANDARD OIL CO., IN THE TOP OF A JAGGED ROCK LEDGE, AND 3 FEET HIGHER THAN THE RAIL. A STANDARD DISK, STAMPED W 7 1933.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • The geoid height was determined by GEOID99.
  • The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (g = 980.6199 gals.).
  • The modeled gravity was interpolated from observed gravity values.

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