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Details for Benchmark: LX0483

N 41° 30.017 W 072° 33.000 (NAD 83)

Altitude: 25.1

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

Location:
In MIDDLESEX county, CT View Original Datasheet
Designation:
K 16
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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The bridge is gone, but was able to find the disk.

[Photos:]
photobenchmark LX0483
photobenchmark LX0483 close

Documented History (by the NGS)

01/01/1935 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1935 AT HIGGANUM. AT HIGGANUM, MIDDLESEX COUNTY, 300 FEET SOUTH OF THE NEW YORK, NEW HAVEN AND HARTFORD RAILROAD STATION, 25 FEET NORTH OF OVERHEAD TIMBER BRIDGE 21.21, IN THE TOP OF A LEDGE, 7 FEET EAST OF THE CENTERLINE OF THE TRACK, AND ABOUT 2 FEET HIGHER THAN THE TRACK.
01/01/1952 by USGS (GOOD)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1952 RECOVERED IN GOOD CONDITION.
01/01/1972 by CTGS (GOOD)
RECOVERY NOTE BY CONNECTICUT GEODETIC SURVEY 1972 RECOVERED IN GOOD CONDITION.
03/09/1998 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1998 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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