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Details for Benchmark: LX2831

N 41° 23.050 W 072° 38.583 (NAD 83)

Altitude: 380.52

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

Location:
In NEW HAVEN county, CT View Original Datasheet
Designation:
43 T OF MADISON
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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Recovered in OK condition - it's pretty scuffed and hard to read.

[Photos:]
photoThe benchmark
Hard to read...
photoThe marker
I guess this is from the last time they (whoever they are) checked on the marker.

Documented History (by the NGS)

Unknown by CT0360 (MONUMENTED)
01/01/1985 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1985 2.8 KM (1.75 MI) NORTH FROM NORTH MADISON. 2.8 KM (1.75 MI) NORTH ALONG STATE HIGHWAY 79 FROM THE JUNCTION OF STATE HIGHWAY 80 IN NORTH MADISON TO THE MARK ON THE RIGHT, IT IS A TOWN OF MADISON MARK, 6.10 METERS (20.0 FT) NORTHEAST OF THE CENTERLINE OF THE HIGHWAY, 31.70 METERS (104.0 FT) NORTH AND ACROSS THE HIGHWAY FROM UTILITY POLE 929. THE MARK IS 0.3 M ABOVE HIGHWAY.

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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