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Details for Benchmark: AB4822

N 40° 56.217 W 102° 54.258 (NAD 83)

Altitude: 4128

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

Location:
In LOGAN county, CO View Original Datasheet
Designation:
39 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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found as stated

[Photos:]
photoDSC01421.JPG
photoDSC01422.JPG

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 10 MILES (16.1 KM) NORTHEAST OF PROCTOR, IN THE SW 1/4 OF SEC. 12, T. 11 N., R. 50 W. TO REACH FROM PROCTOR, GO NORTHEAST ON SH 138 FOR 3 MILES (4.8 KM) TO COUNTY ROAD 71, GO NORTH ON COUNTY ROAD 71 FOR 7.9 MILES (12.7 KM) TO THE MARK ON THE RIGHT (EAST). STATION MARK IS A BRASS DISK SET IN A CONCRETE POST, 48 FT (14.6 M) EAST OF THE CENTER OF COUNTY ROAD 71, 13 FT (4.0 M) NORTH OF A FENCE CORNER, 1 FT (0.3 M) WEST OF A FENCE, 2 FT (0.6 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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