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Details for Benchmark: LX0923

N 41° 18.783 W 073° 04.700 (NAD 83)

Altitude: 19.21

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

Location:
In NEW HAVEN county, CT View Original Datasheet
Designation:
K 13
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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As described plus someone had cleaned dirt/sand away from it so it was easy to find.

[Photos:]
photobenchmark LX0923
photobenchmark LX0923 close

Documented History (by the NGS)

1/1/1935 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1935 AT DERBY. AT DERBY, NEW HAVEN COUNTY, ON THE NEW YORK, NEW HAVEN AND HARTFORD RAILROAD, 1,200 FEET SOUTH OF A BRIDGE OVER NAUGATUCK RIVER, IN THE TOP OF A PARAPET OF A 200-FOOT RETAINING WALL, 42 FEET NORTH OF THE SOUTH END, 70 FEET SOUTH OF A SEMAPHORE TOWER, 10 FEET EAST OF THE EAST RAIL, AND ABOUT 6 INCHES LOWER THAN THE TRACK. A STANDARD DISK, STAMPED K 13 1935.
1/1/1941 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1941 RECOVERED IN GOOD CONDITION.
1/1/1985 by NGS (MARK NOT FOUND)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1985 NOT RECOVERED, THE DISK HAS BEEN PRIED OUT OF THE DRILL HOLE.
1/1/1988 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1988 (JAC) RECOVERED IN GOOD CONDITION.
3/4/1991 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1991 (JAC) MARK NOT FOUND.

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 1992. * This is a POSTED BENCH MARK height. Code A indicates a distribution rate of 0.0 thru 1.0 mm/km.
  • 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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