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Details for Benchmark: LW1070

N 41° 55.100 W 071° 54.750 (NAD 83)

Altitude: 273.57

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

Location:
In WINDHAM county, CT View Original Datasheet
Designation:
274
Marker Type:
survey disk
Setting:
massive structures with deep foundations
Stability:
Most reliable and expected to hold position/elevation well.

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Recovered in good condition, as described.

[Photos:]
photoDisk and horseshoe, Putnam CT

Documented History (by the NGS)

Unknown by USGS (MONUMENTED)
01/01/1935 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1935 IN PUTNAM. AT PUTNAM, WINDHAM COUNTY, AT THE MUNICIPAL BUILDING, IN THE FOUNDATION OF A WATER TABLE, 5 FEET NORTHEAST OF THE SOUTH CORNER, 50 FEET WEST OF THE CENTERLINE OF CHURCH STREET, AND ABOUT 6 INCHES ABOVE THE LAWN.
01/01/1936 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1936 RECOVERED IN GOOD CONDITION.
01/01/1984 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1984 RECOVERED IN GOOD CONDITION.
01/01/1986 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1986 RECOVERED IN GOOD CONDITION.
01/01/1988 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1988 (RMS) RECOVERED IN GOOD CONDITION.
05/03/1990 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1990 (RMS) 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. WARNING-Repeat measurements at this control monument indicate possible vertical movement.
  • 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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