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Details for Benchmark: FQ0178

N 35° 10.017 W 111° 07.667 (NAD 83)

Altitude: 5432.78

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

Location:
In COCONINO county, AZ View Original Datasheet
Designation:
N 3
Marker Type:
bolt
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Coup of the trip - 730 vertical (half up/half down) steps west of 1909 PLN O3.

[Photos:]
photoFQ0178 PLN N3 1909
photoFQ0178 DOWN & ESE
photoPLN COPPER BOLT 1909
BACK UP THE TRACK A BIT

Documented History (by the NGS)

Unknown by CGS (MONUMENTED)
01/01/1934 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1934 IN CANYON DIABLO. AT CANYON DIABLO, COCONINO COUNTY, ON THE ATCHISON, TOPEKA AND SANTA FE RAILWAY, 8 POLES WEST OF MILEPOST 312, AT STEEL TRESTLE A 313 OVER CANYON DIABLO, IN THE TOP OF THE NORTH END OF THE WEST ABUTMENT, 1 FOOT FROM THE FACE, AND 1-1/2 FEET FROM THE END OF THE COPING STONE. A COPPER BOLT, SURROUNDED BY THE LETTERS USBM.

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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