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Details for Benchmark: GQ0034

N 36° 50.767 W 112° 16.183 (NAD 83)

Altitude: 6140.95

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

Location:
In COCONINO county, AZ View Original Datasheet
Designation:
B 52
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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N 36° 50.789 W 112° 16.212

Found this benchmark today in good condition.

[Photos:]
photoCloseup of the benchmark with GPS
photoWide view of the mark

Found

N 36° 50.785 W 112° 16.212

Bench Mark B 52 was recovered as described, in good condition. This mark is located just off of U.S. 89A at Milepost 592.9.

[Photos:]
photoGQ0034 20060509 G (Coconino Co. AZ)
Bench Mark B 52 w/GPSr.
photoGQ0034 20060509 C (Coconino Co. AZ)
Bench Mark B 52.
photoGQ0034 20060509 B (Coconino Co. AZ)
Bench Mark B 52 from Eye Level.
photoGQ0034 20060509 A1 S (Coconino Co. AZ)
South at Bench Mark B 52.
photoGQ0034 20060509 A2 NW (Coconino Co. AZ)
Northwest at Bench Mark B 52.
N 36° 50.787 W 112° 16.212

Recovered as described in good condition.

USGS did not find it, so that makes it a First to Recover for the contest!

[Photos:]
photoB 52 north of Jacob Lake, AZ
photoB 52 looking north into Utah

Documented History (by the NGS)

1/1/1934 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1934 17.0 MI SE FROM FREDONIA. 17.0 MILES SOUTHEAST ALONG U.S. HIGHWAY 89 FROM FREDONIA, COCONINO COUNTY, 1.0 MILE NORTHEAST OF A CATTLE GUARD AND FENCE ON THE WEST BOUNDARY OF THE KAIBAB NATIONAL FOREST, 71 FEET NORTHEAST OF A 2-FOOT IRON-PIPE CULVERT, 61 FEET SOUTHEAST OF THE CENTERLINE OF THE HIGHWAY, ON THE EAST EDGE OF A RAVINE, AND IN THE TOP OF A LIMESTONE OUTCROP. A STANDARD DISK, STAMPED B 52 1934.
1/1/1966 by USGS (MARK NOT FOUND)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1966 MARK NOT FOUND.

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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