Skip to Content

Details for Benchmark: AB4819

N 40° 39.212 W 102° 58.322 (NAD 83)

Altitude: 4410

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

Location:
In LOGAN county, CO View Original Datasheet
Designation:
15 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.

Must Read!

Benchmarks may be on private property or in dangerous locations. Obey local laws. By using the services on Geocaching.com you agree to this disclaimer.

found in good cond.

[Photos:]
photoAB4819 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 13 MILES (20.9 KM) EAST OF STERLING, IN THE NW 1/4 OF SEC. 21, T. 8 N., R. 50 W. OWNERSHIP-- PRIVATE PROPERTY. TO REACH THE STATION FROM THE INTERSECTION OF US 6 AND COUNTY ROAD 67, GO SOUTH ON COUNTY ROAD 67 FOR 2.5 MILES (4.0 KM) TO COUNTY ROAD 30, GO WEST ON COUNTY ROAD 30 FOR 1.0 MILE (1.6 KM) TO COUNTY ROAD 65, GO NORTH ON AN EXTENSION OF COUNTY ROAD 65 FOR 0.55 MILES (0.89 KM) TO A BARBED WIRE FENCE AND GATE, CONTINUE NORTH FOR 0.25 MILES (0.40 KM) TO THE STATION ON THE RIGHT. STATION MARK IS A BRASS DISK SET IN A 12 IN SQUARE CONCRETE POST PROJECTING 10 CM ABOVE THE GROUND ON THE NORTHWESTERN SIDE OF A HILL, 17.8M EAST OF A WESTERN FENCE LINE, 11.3M SOUTH OF A FENCE CORNER, 0.6 M SOUTH OF A WITNESS POST AND 0.2 M (0.7 FT) WEST OF A WESTERN FENCE LINE.

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.

Advertising with Us

Return to the Top of the Page