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Details for Benchmark: AB4818

N 40° 40.511 W 103° 29.148 (NAD 83)

Altitude: 4262

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

Location:
In LOGAN county, CO View Original Datasheet
Designation:
JB 33
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 in good cond.

[Photos:]
photoAB4818 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 9 MILES (14.5 KM) NORTH OF WILLARD, IN THE SW 1/4 OF SEC. 12, T. 8 N., R. 55 W. TO REACH THE STATION FROM THE INTERSECTION OF COUNTY ROAD 34 AND COUNTY ROAD 11, GO NORTH ON COUNTY ROAD 11 FOR 0.5 MILES (0.8 KM) TO THE STATION ON THE RIGHT (EAST). STATION MARK IS A BRASS DISK IN AN 8IN SQUARE CONCRETE POST PROJECTING 8 CM ABOVE THE GROUND ABOUT THE SAME HEIGHT AS THE ROAD, 9.2 M EAST OF THE CENTER OF COUNTY ROAD 11 (DIRT), 2.2 M SOUTH OF THE PROJECTED FENCE LINE GOING WEST, 0.6 M NORTH NORTHEAST OF A WITNESS POST, 0.1 M WEST OF A BARBED WIRE FENCE.

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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