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Details for Benchmark: AB4823

N 40° 43.696 W 102° 56.407 (NAD 83)

Altitude: 4097

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

Location:
In LOGAN county, CO View Original Datasheet
Designation:
21 WF
Marker Type:
bench mark 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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Foung in good cond.

[Photos:]
photoAB4823 1948

Documented History (by the NGS)

01/01/1948 by USGS (MONUMENTED)
01/01/1995 by CODOT (GOOD)
DESCRIBED BY COLORADO DEPARTMENT OF TRANSPORTATION 1995 STATION IS LOCATED ABOUT 5.5 MILES (8.9 KM) SOUTH OF PROCTOR, IN THE NE 1/4 OF SEC. 28, T. 9 N., R. 50 W. TO REACH FROM EXIT 141 ON I-76, GO SOUTH ON COUNTY ROAD 67 FOR 2.8 MILES (4.5 KM) (FROM THE CENTERLINE OF I-76) TO THE STATION ON THE RIGHT (WEST). STATION MARK IS A BRASS DISK SET IN A CONCRETE POST, 46 FT (14.0 M) SOUTH OF A T FENCE INTERSECTION ON THE EAST SIDE OF THE ROAD, 4 FT (1.2 M) SOUTH OF A FIBERGLASS WITNESS POST (NOAA).

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in July 1996.
  • The orthometric height was determined by GPS observations and a high-resolution geoid model.
  • The X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • The geoid height was determined by GEOID99.

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