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Details for Benchmark: LX0380

N 41° 17.833 W 072° 55.617 (NAD 83)

Altitude: 15.15

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

Location:
In NEW HAVEN county, CT View Original Datasheet
Designation:
Q 3
Marker Type:
survey disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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easy one,
found as described

[Photos:]
photoLX0380
LX0380 closeup

Ah here it is on the corner, in good condition.

[Photos:]
photobenchmark LX0380
photobenchmark LX0380 close

Documented History (by the NGS)

01/01/1922 by CGS (MONUMENTED)
01/01/1965 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1965 AT NEW HAVEN. AT NEW HAVEN, AT THE JUNCTION OF UNION AVENUE AND WATER STREET, SET VERTICALLY IN THE NORTHWEST FACE OF THE WEST CORNER OF THE NEW YORK, NEW HAVEN AND HARTFORD RAILROAD STATION, 57 FEET SOUTHEAST OF THE SOUTHEAST CURB OF UNION AVENUE, 3 FEET NORTHEAST OF THE WEST CORNER OF THE BUILDING AND 1.6 FEET ABOVE THE LEVEL OF THE SIDEWALK.
01/01/1978 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 RECOVERED IN GOOD CONDITION.
01/01/1985 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1985 THE BUTTMENTS ARE STILL IN PLACE, THE MARK IS STILL IN IT''S POSITION. A NEW BRIDGE HAS BEEN BUILT ABOUT 100 YARDS TO THE SOUTH OF THE OLD BRIDGE. NEW BRIDGE BUILT IN 1969.
01/01/1988 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1988 (JAC) 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. The observed gravity was obtained from relative gravimeter ties to the IGSN71 gravity network.

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