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Details for Benchmark: MZ0121

N 42° 07.800 W 072° 44.717 (NAD 83)

Altitude: 155.05

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

Location:
In HAMPDEN county, MA View Original Datasheet
Designation:
F 6
Marker Type:
bench mark disk
Setting:
setting not listed - see description
Stability:
Mark of questionable or unknown stability.

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Coords are way off on this one, I was concerned it didn't make it through the new bridge construction, but after reading the description, we made our way over to the old station. I had these coords: N 42° 07.804 W 072° 44.742.

[Photos:]
photoIMG_20151227_121705639

In good shape on the rear of the building.

Documented History (by the NGS)

01/01/1933 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1933 AT WESTFIELD. ON B AND A RR. AT WESTFIELD B AND A RR STATION. ON SOUTH FACE OF RR STATION. 13 FT. WEST OF SOUTH EAST CORNER OF STATION. 21 FT. NORTH OF CENTER LINE OF WEST BOUND TRACK. 5 FT. ABOVE TOP OF RAIL. NOTE--MARK IS 22 FEET NORTH OF THE CENTER LINE OF WESTBOUND TRACK.
01/01/1934 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1934 RECOVERED IN GOOD CONDITION.
01/01/1980 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1980 RECOVERED IN GOOD CONDITION.

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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