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Details for Benchmark: LX3275

N 41° 38.317 W 072° 27.667 (NAD 83)

Altitude: 481.08

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

Location:
In HARTFORD county, CT View Original Datasheet
Designation:
Q 86
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Documented History (by the NGS)

01/01/1986 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1986 0.5 KM (0.3 MI) NW FROM MARLBOROUGH. 0.5 KM (0.3 MI) NORTHWEST ALONG THE ON RAMP TO STATE HIGHWAY 2 FROM THE JUNCTION OF STATE HIGHWAY 66 TO THE MARK ON THE RIGHT, 19.11 METERS (62.7 FT) EAST OF THE CENTERLINE OF THE NORTHBOUND LANES OF THE HIGHWAY, 23.16 METERS (76.0 FT) NORTH OF THE MOST WESTERLY PIER OF A SET OF THREE ON THE EAST SIDE OF THE HIGHWAY, 5.05 METERS (16.6 FT) SOUTH OF THE NORTH END OF THE EAST ABUTMENT OF A BRIDGE OVER THE HIGHWAY. THE MARK IS ABOVE LEVEL WITH HIGHWAY.

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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