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Details for Benchmark: JK0734

N 38° 51.186 W 105° 39.143 (NAD 83)

Altitude: 9245.17

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

Location:
In PARK county, CO View Original Datasheet
Designation:
V 288
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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found today with 2/3 Marine

Found as described in good condition.

[Photos:]
photoJK0734 V 288

Documented History (by the NGS)

01/01/1951 by CGS (MONUMENTED)
01/01/1952 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1952 12.4 MI NW FROM GUFFEY. 1.4 MILES SOUTH ALONG A GRAVELED ROAD FROM THE POST OFFICE AT GUFFEY, THENCE 11.05 MILES NORTHWEST ALONG STATE HIGHWAY 9, 0.3 MILE NORTHWEST OF A SMALL WOODEN BRIDGE, 300 YARDS EAST OF A FENCE CORNER, 75 FEET NORTHEAST OF THE CENTER LINE OF THE HIGHWAY, ON TOP OF A SMALL KNOLL, 10 FEET ABOVE THE LEVEL OF THE HIGHWAY, 1 FOOT ABOVE THE GROUND, SET IN THE TOP OF A GRANITE OUTCROP.
05/25/1991 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1991 STATION IS LOCATED ABOUT 55 KM (34.2 MI) NORTHWEST OF CANON CITY, 22 KM (13.7 MI) SOUTHEAST OF HARTSEL, IN THE PIKE NATIONAL FOREST, ALONG STATE HIGHWAY 9, AT MILE 32.5, 2 KM (1.2 MI) NORTHWEST OF CURRENT CREEK PASS, ON A SMALL HUMP, IN THE NORTHEAST 1/4 OF SECTION 10, T 14 S, R 74 W. OWNERSHIP--US FOREST SERVICE. TO REACH FROM THE JUNCTION OF US HIGHWAY 50 AND STATE HIGHWAY 9 (ABOUT 12 KM (7.5 MI) WEST OF CANON CITY), GO NORTHWEST ON HIGHWAY 9 FOR 21.1 MI (34.0 KM) TO ITS JUNCTION WITH COUNTY ROAD 102 ON THE RIGHT. KEEP LEFT ON HIGHWAY 9 FOR 9.85 MI (15.85 KM) TO TOP OF GRADE AT CURRENT PASS. CONTINUE AHEAD FOR 0.95 MI (1.53 KM) TO A DIRT CROSSROAD WITH CATTLE GUARDS. CONTINUE AHEAD FOR 1.55 MI (2.49 KM) TO THE HUMP AND STATION ON THE RIGHT. STATION MARK IS SET IN A DRILL HOLE ON THE SOUTHWEST SIDE OF A 10 M (32.8 FT) LONG HUMP ROCK OUTCROP, 5.3 M (17.4 FT) SOUTH OF THE HIGHEST POINT AND ABOUT 0.5 M (1.6 FT) LOWER THAN, 2 M (6.6 FT) SOUTHWEST OF THE TOP OF SPINE, 4.4 M (14.4 FT) NORTHEAST OF THE RIGHT-OF-WAY FENCE, 21.6 M (70.9 FT) NORTHEAST OF, AND ABOUT 6 M (19.7 FT) HIGHER THAN THE HIGHWAY CENTER. DESCRIBED BY G.R.HEID
01/31/1992 by CODOT (GOOD)
RECOVERY NOTE BY COLORADO DEPARTMENT OF TRANSPORTATION 1992 RECOVERED IN GOOD CONDITION.
09/28/1992 by CODOT (GOOD)
RECOVERY NOTE BY COLORADO DEPARTMENT OF TRANSPORTATION 1992 RECOVERED IN GOOD CONDITION.
10/05/1992 by CODOT (GOOD)
RECOVERY NOTE BY COLORADO DEPARTMENT OF TRANSPORTATION 1992 RECOVERED IN GOOD CONDITION.
03/12/1994 by MSAM (GOOD)
RECOVERY NOTE BY MOUNTAIN SURVEYING 1994 (KCH) RECOVERED AS DESCRIBED.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in May 1992.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • 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.
  • 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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