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Details for Benchmark: LX0481

N 41° 30.217 W 072° 33.217 (NAD 83)

Altitude: 15.02

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

Location:
In MIDDLESEX county, CT View Original Datasheet
Designation:
TIDAL 5 STA 12
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Found this while DNFing a cache.

great view, and cool bridge

This Benchmark was in good shape. Be careful...

Found while seeking the adjacent cache.

Found it.

Found in good shape.

I found this in April when I placed a cache stage within feet of this mark. I write this in July, having finally figured out how to search and identify my first benchmark find. Cool!

Found in good condition.

[Photos:]
photobenchmark LX0481
photobenchmark LX0481 close
photobenchmark LX0481 by the CT river
photobenchmark LX0481 by the CT river too

Documented History (by the NGS)

01/01/1917 by CGS (MONUMENTED)
01/01/1935 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1935 AT HIGGANUM. AT HIGGANUM, MIDDLESEX COUNTY, 0.2 MILE NORTH OF THE NEW YORK, NEW HAVEN AND HARTFORD RAILROAD STATION, AT BRIDGE 21.49, IN THE TOP OF THE EAST SIDE OF THE NORTH BRIDGE SEAT, 9 FEET EAST OF THE CENTERLINE OF THE TRACK, AND ABOUT 3 1/2 FEET LOWER THAN THE TRACK.
01/01/1951 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1951 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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