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Details for Benchmark: LX2830

N 41° 24.000 W 072° 39.183 (NAD 83)

Altitude: 295.19

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

Location:
In NEW HAVEN county, CT View Original Datasheet
Designation:
303
Marker Type:
survey disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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The benchmark is there. It is not in the large outcropping where the drillhole with orange triangle is located as noted by firefighter skippy, but it is in a very small rock north, (perhaps 30 feet?) of that location. It is worn, but still intact, barely above the road surface.

Well, I didn't find a disk, but I did find a drillhole in an etched triangle and seems to have an outline of a disk, In the aproximate location. Also noted new/changed telephone poles in the area.

[This entry was edited by Firefighter Skippy on Thursday, April 13, 2006 at 1:46:05 PM.]

[Photos:]
photobenchmark LX2830

Documented History (by the NGS)

1/1/1935 by CTGS (MONUMENTED)
1/1/1985 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1985 4.7 KM (2.9 MI) NORTH FROM NORTH MADISON. 4.7 KM (2.95 MI) NORTH ALONG STATE HIGHWAY 79 FROM THE JUNCTION OF STATE HIGHWAY 80 IN NORTH MADISON TO THE MARK ON THE LEFT, IN TOP OF A ROCK OUTCROP NEAR THE SOUTH END OF A WIDE PULL-OFF AREA, 7.01 METERS (23.0 FT) WEST OF THE CENTERLINE OF THE HIGHWAY, 13.47 METERS (44.2 FT) NORTHEAST OF UTILITY POLE 950. THE MARK IS 0.2 M ABOVE HIGHWAY.
4/7/1991 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1991 (JAC) RECOVERED IN GOOD CONDITION.
8/13/1995 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1995 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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