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Details for Benchmark: LX2857

N 41° 24.300 W 072° 53.917 (NAD 83)

Altitude: 100.06

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

Location:
In NEW HAVEN county, CT View Original Datasheet
Designation:
126
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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Was walking by this one today. It is totally buried by the grass. Do not attempt to locate unless you are a surveyor.

I was at work today, at the firehouse just 200ft from this mark, and saw a surveyor in the area of this benchmark, so I decided to take a walk over and see what he was doing. Sure enough, he was looking for the benchmark. He found it, in it's proper location, but it had been seriously damaged by the construction that was noted in my last note. The South side of the mark had been broken off and the mark seemed to be off level a little. The mark is on private Quinnipiac University property, so it may not be accessible if it is re-buried by grass, as it has been. I will update the status if the accessibility changes.

Jeff

I'm pretty sure that this benchmark is either buried or destroyed. This whole area was dug up when the new museum was built. I looked today for the mark and there is no evidence that it is there.

Found it in good shape. Usable for survey grade GPS if set up high enough to avoid nearby signs.

[Photos:]
photo602A NGS 126
photo602B NGS 126

The paint and the fact that the mark was unburried made this an easy find.

[Photos:]
photobenchmark LX2857
photobenchmark LX2857 close

Found this while working nearby. The benchmark is painted bright orange and set about 3 inches lower than the surrounding grass. There is an arrow on the sidewalk pointing to the mark.

Documented History (by the NGS)

1/1/1940 by CTGS (MONUMENTED)
1/1/1985 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1985 IN HAMDEN. IN HAMDEN, 0.2 KM (0.1 MI) NORTH ALONG STATE HIGHWAY 10 FROM THE JUNCTION OF STATE HIGHWAY 22, IN THE LAWN OF THE MOUNT CARMEL LIBRARY OFFICE BUILDING, 7.92 METERS (26.0 FT) EAST OF THE CENTER LINE OF THE HIGHWAY, 24.57 METERS (80.6 FT) NORTHWEST OF THE SOUTHWEST CORNER OF THE BUILDING, 22.86 METERS (75.0 FT) SOUTHWEST OF THE NORTHWEST CORNER OF THE BUILDING, 1.10 METERS (3.6 FT) NORTH OF THE NORTH EDGE OF THE SIDEWALK LEADING TO THE BUILDING. THE MARK IS ABOVE LEVEL WITH 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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