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Details for Benchmark: GQ0010

N 36° 43.717 W 112° 03.617 (NAD 83)

Altitude: 5754.41

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

Location:
In COCONINO county, AZ View Original Datasheet
Designation:
K 51
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° 43.740 W 112° 03.708

Didn't think that we would be back this soon for another attempt, but here we are. From review of the previous pix, we knew that we were looking in the right area last time, but not quite. This time, we were able to walk right up, we had all the right tools in hand, and made the find quickly. Cleaned the mark up well, and left it exposed for the ease of find for the next benchmarker - unless Mother Nature decides to hide it again.

[Photos:]
photoCloseup of the benchmark with GPS
photoEye-level view of the mark
photoWide view looking north

Arrrrgh! We WERE looking in the right spot! We just didn't dig deep enough! Next time !!

N 36° 43.740 W 112° 03.708

Had to try 1 more time. We measured from a point on a quad map called Houserock (the point is called Houserock) to where the benchmark should be located. It took us back to where we had looked before. Shirley then asked if I had metal detected the cluster of yucca plants. No I had only eyeballed them before and thought they were too far from the falls. I then paced from the edge of the falls and stopped about 4 1/2 feet from the yuccas. Where I had stopped was a small cluster bushes, so that is where I started with the metal detector. Under 1 of the bushes the detector sounded off, so I scraped away dirt and rocks with my shoe and tried again, more beeps, more scraping, then I tried probing with the screwdriver and felt the disk. Cleaned it off and got the pictures.

Recovered in good condition.

[Photos:]
photoK 51 view east
photoK 51 view north
photoK 51 view west
photoK 51 in northern AZ

I met up today with half of 2OFs to search for K 51, and we came up empty. Measurements from the described culvert and center of the fall in the wash put us on an appropriate piece of limestone, but we were unable to find the mark. My sense is that it's probably still there but the forces of nature have hidden it away over the last 75 years.

Could not find this one. We measured from the center of the road, from the culvert, and from the waterfall. We then got out the metal detector and cover the whole area. Nothing. Either the disk is gone or we were at the wrong culvert & waterfall.

Documented History (by the NGS)

01/01/1934 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1934 1.5 MI W FROM HOUSE ROCK SPRINGS. 1.5 MILES WEST ALONG U.S. HIGHWAY 89 FROM HOUSE ROCK SPRINGS, COCONINO COUNTY, 66 FEET EAST OF AN 18-INCH CORRUGATED-IRON PIPE CULVERT, 87 FEET EAST OF THE CENTERLINE OF THE HIGHWAY, 41 FEET SOUTH OF A FALL IN A WASH, AND IN THE TOP OF A BROWN LIMESTONE OUTCROP. A STANDARD DISK, STAMPED K 51 1934.

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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