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Details for Benchmark: JK0163

N 38° 58.433 W 104° 49.983 (NAD 83)

Altitude: 6441.07

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

Location:
In EL PASO county, CO View Original Datasheet
Designation:
C 354
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Found this one as described in good shape.

[Photos:]
photoJK0163 C 354

Don't think this is in the wrong datum because my GPS led me right to the spot where this BM is indicated on my USGS map. But the area is overgrown and lacks any of the features in the description. Area has definitely changed since 1954 since they started building the Air Force Academy just a couple years after that.

Documented History (by the NGS)

01/01/1954 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1954 8.8 MI S FROM MONUMENT. 0.2 MILE WEST ALONG A GRAVELED STREET FROM THE GRADE SCHOOL AT MONUMENT, THENCE 8.6 MILES SOUTH ALONG THE DENVER AND RIO GRANDE WESTERN RAILROAD, 21 FEET WEST OF THE WEST RAIL, 56 FEET EAST OF THE CENTER LINE OF A ROAD, 4 FEET BELOW THE TOP OF THE RAILS, SET IN THE TOP OF THE NORTH END OF THE WEST HEADWALL OF A CONCRETE CULVERT.

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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