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Details for Benchmark: KK0666

N 39° 45.500 W 105° 01.083 (NAD 83)

Altitude: 5290.89

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

Location:
In DENVER county, CO View Original Datasheet
Designation:
3 A
Marker Type:
rivet
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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18:04 Found the location very easly but it looks like the curb was moved to make a drive up parking area which destroyed the benchmark....

[Photos:]
photoWhere the benchmark should be...
photoA look at the moved curb.

Documented History (by the NGS)

Unknown by CGS (MONUMENTED)
01/01/1939 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1939 AT DENVER. AT DENVER, DENVER COUNTY, ON THE NORTH SIDE OF TWENTY-NINTH AVENUE, EAST OF FIFTH COURT, AT THE MAIN ENTRANCE TO ASHLAND SCHOOL, 30 FEET WEST OF THE STEPS LEADING UP FROM THE SIDEWALK, IN THE TOP OF THE CURB, AND 18 INCHES WEST OF THE WEST ONE OF TWO PLACES WHERE THE SIDEWALK EXTENDS TO THE CURB. A METAL RIVET. NOTE-- PREVIOUSLY DESIGNATED AS BM 3 A.

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. No vertical observational check was made to the station. * This is a POSTED BENCH MARK height. Code NC indicates the bench mark was located on a no-check spur therefore a value was not computed.
  • 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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