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Details for Benchmark: LX3442

N 41° 20.350 W 072° 18.483 (NAD 83)

Altitude: 33.65

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

Location:
In NEW LONDON county, CT View Original Datasheet
Designation:
OLD LYME 10
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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Found it by witness post while in the area.

Found it.®

Found by description. Witness post still in place. Handheld GPS coordinates N 41 20.371 W 72 18.502.

[Photos:]
photoLX3442 Old Lyme New London CT Close Up
A different sort of benchmark disk.
photoLX3442 Old Lyme New London Ct View Southeast

Documented History (by the NGS)

01/01/1938 by LOCENG (MONUMENTED)
01/01/1986 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1986 2.4 KM (1.5 MI) EAST FROM OLD LYME. 2.4 KM (1.5 MI) EAST ALONG U.S. HIGHWAY FROM THE JUNCTION OF INTERSTATE 95 IN OLD LYME TO THE MARK OF THE RIGHT, IT IS 8.1 METERS (26.9 FT) SOUTHEAST OF THE CENTERLINE OF U.S. HIGHWAY 1 AND 0.82 METER (2.7 FT) NORTH OF A 12-INCH MAPLE TREE. THE MARK IS 0.27 METERS S FROM A WITNESS POST THE MARK IS 0.48 M BELOW U.S. HIGHWAY 1.
01/01/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (RMS) RECOVERED IN GOOD CONDITION.
12/06/1990 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.
  • 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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