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Details for Benchmark: JK0729

N 38° 54.267 W 105° 41.833 (NAD 83)

Altitude: 9271.01

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

Location:
In PARK county, CO View Original Datasheet
Designation:
A 289
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 today with 2/3 Marine

Found in good condition as described.

[Photos:]
photoJK0729 A 289

Documented History (by the NGS)

01/01/1951 by CGS (MONUMENTED)
01/01/1952 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1952 10 MI SE FROM HARTSEL. 10.0 MILES SOUTHEAST ALONG STATE HIGHWAY 9 FROM ITS JUNCTION WITH U.S. HIGHWAY 24 AT HARTSEL, 215 FEET NORTHWEST OF THE CENTER OF A SMALL WOODEN BRIDGE, 210 FEET SOUTHEAST OF THE SOUTHEAST SIDE OF A GROVE OF ASPEN TREES, 80 FEET NORTHEAST OF THE CENTER LINE OF THE HIGHWAY, 3 FEET NORTHWEST OF A WITNESS POST, SET IN THE TOP OF A CONCRETE POST WHICH PROJECTS 0.7 FOOT ABOVE THE GROUND.

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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