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Details for Benchmark: KM0140

N 39° 06.317 W 109° 05.183 (NAD 83)

Altitude: 4339.42

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

Location:
In GRAND county, UT View Original Datasheet
Designation:
E 14
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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found on a 100degree day, july 14,2010.

Via kayak. This appears to be a huge freestanding rock that slabbed off the cliff years ago. It is at the edge of the river and the top is about 15 feet above the current water level.

[Photos:]
photoKM0140 E 14 1927
photoKM0140 E
STANDING ON MARK, LOOKING UPSTREAM
photoKM0140 WSW
photoKM0140 BOAT RAMP
ABOUT 2 RIVER MILES DOWNSTREAM FROM THE MARK
photoKM0140 BLM RANGER STATION
A VERY BUSY PLACE DURING THE FLOATING SEASON

Documented History (by the NGS)

01/01/1927 by CGS (MONUMENTED)
01/01/1934 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1934 1.8 MI NE FROM WESTWATER. 1.8 MILES NORTHEAST ALONG THE DENVER AND RIO GRANDE WESTERN RAILROAD FROM WESTWATER, GRAND COUNTY, 55 FET EAST OF THE CENTERLINE OF THE TRACK, IN A SANDSTONE LEDGE, 15 FEET FROM THE NORTH END OF THE LEDGE, AND 2 FEET FROM THE WEST EDGE. A STANDARD DISK STAMPED 4336.035 E 14 1927.

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 A indicates a distribution rate of 0.0 thru 1.0 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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