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Details for Benchmark: JK0468

N 38° 31.750 W 105° 23.250 (NAD 83)

Altitude: 6195.76

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

Location:
In FREMONT county, CO View Original Datasheet
Designation:
X 286
Marker Type:
bench mark disk
Setting:
in a boulder
Stability:
May hold, but of type commonly subject to surface motion.

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found today with 2/3 Marine

Found as described no problem, in good condition.

[Photos:]
photoJK0468 X 286

Searched the whole area around the bridge on Hwy 9, but no granite boulder and no disk. Possibly moved or destroyed with highway repaving, etc.

Documented History (by the NGS)

01/01/1951 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1951 6 MI NW FROM PARKDALE. 1.3 MILES SOUTHEAST ALONG THE DENVER AND RIO GRANDE WESTERN RAILROAD FROM THE STATION AT PARKDALE, THENCE 1.6 MILES NORTHEAST ALONG U.S. HIGHWAY 50, THENCE 3.15 MILES NORTHWEST ALONG STATE HIGHWAY 9, 210 FEET SOUTHEAST OF THE CENTER OF A WIRE GATE, 85 FEET NORTHWEST OF THE NORTHWEST CORNER OF A STEEL BRIDGE, 65 FEET NORTH OF THE CENTER LINE OF THE HIGHWAY, 24 FEET SOUTHEAST OF THE CENTER LINE OF A DIRT ROAD LEADING NORTH, 6 FEET ABOVE THE LEVEL OF THE HIGHWAY, 1 FOOT ABOVE THE GROUND, SET IN THE TOP OF THE CENTER OF A 3X5 FOOT GRANITE BOULDER.
10/06/1988 by CODH (GOOD)
RECOVERY NOTE BY COLORADO STATE DEPARTMENT OF HIGHWAYS 1988 RECOVERED IN GOOD CONDITION.

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 June 1991.
  • 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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