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Details for Benchmark: GN0006

N 36° 59.433 W 106° 12.267 (NAD 83)

Altitude: 9109.97

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

Location:
In TAOS county, NM View Original Datasheet
Designation:
K 58
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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I found and photographed this benchmark that was placed along the tracks of the Cumbres and Toltec Scenic Rail Road. The benchmark is in pretty good shape. The concrete of the pedestal is starting to distintegrate, but is still sound. Timed my visit to coincide with the passage of the eastbound.

[Photos:]
photoGN0006
photoGN0006 and Train

Documented History (by the NGS)

01/01/1934 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1934 21.8 MI W FROM ANTONITO, COLORADO. IN TAOS COUNTY, NEW MEXICO, 21.8 MILES WEST ALONG THE DENVER AND RIO GRANDE WESTERN RAILROAD FROM ANTONITO, CONEJOS COUNTY, COLORADO, 29 FEET SOUTHEAST OF MILEPOST 302, AND 19 FEET SOUTHEAST OF THE CENTER LINE OF THE TRACK. A STANDARD DISK, STAMPED K 58 1934 AND SET IN THE TOP OF A CONCRETE POST.

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 1992. * This is a POSTED BENCH MARK height. Code B indicates a distribution rate of 1.1 thru 2.0 mm/km.
  • 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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