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Details for Benchmark: GQ0051

N 36° 02.517 W 112° 09.467 (NAD 83)

Altitude: 6685.92

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

Location:
In COCONINO county, AZ View Original Datasheet
Designation:
R 61
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Documented History (by the NGS)

01/01/1934 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1934 2.0 MI S FROM GRAND CANYON. 2 MI SOUTH ON A.T.S.F. RY, FROM EL TOVAR HOTEL. 40 YARDS SOUTHEAST OF MILE POLE 62, 38 FEET WEST OF A DRY WASH, 73 FEET SOUTH OF A 4-STRAND WIRE FENCE, AND 66 FEET WEST OF THE CENTERLINE OF THE TRACK. SET IN A LIMESTONE LEDGE, AND 2 FEET SOUTH OF A SMALL ROCK MOUND.
05/10/1985 by USGS (GOOD)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1985 (DLL) RECOVERED IN GOOD CONDITION.

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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