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Details for Benchmark: LX3073

N 41° 33.700 W 072° 33.783 (NAD 83)

Altitude: 170.51

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

Location:
In MIDDLESEX county, CT View Original Datasheet
Designation:
1771
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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A little scratched up but in otherwise good condition and easy to find by the witness post.

[Photos:]
photobenchmark LX3073 1771 by post
photobenchmark LX3073 witness post view
photobenchmark LX3073 1771
photobenchmark LX3073 mark & witness post

Documented History (by the NGS)

01/01/1938 by CTGS (MONUMENTED)
01/01/1986 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1986 0.6 KM (0.4 MI) WEST FROM COBALT. 0.6 KM (0.35 MI) WEST ALONG STATE HIGHWAY 66 FROM THE JUNCTION OF STATE HIGHWAY 151 IN COBALT TO THE MARK ON THE RIGHT AND ACROSS THE HIGHWAY FROM POWER POLE NO. 2106, 12.3 METERS (40.5 FT) NORTH OF THE CENTERLINE OF THE HIGHWAY, 3.2 METERS (10.5 FT) SOUTH OF A FENCELINE, 1.4 METERS (4.6 FT) EAST OF A 5-INCH OAK TREE. THE MARK IS 0.36 METERS W FROM A WITNESS POST THE MARK IS 4.5 M ABOVE HIGHWAY.
09/04/1997 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1997 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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