N 31.991183° W 112.750867°
1999 ft.
Triangulation Station Disk
Year Established:
Established By:
Good as of May 19, 2007

On our first day in Ajo, we decided to do the auto tour of Ajo Mountain Drive. We were a bit late in the day and were concerned that they might close the gate on us before we could complete the loop; fortunately that did not happen. Our slight concern wasn't enough to prevent us from stopping a few miles in to look for the tri-station LOW HILL on a small knoll very close to the road. The station and both reference marks were found easily and in good condition.

The next day we came back to look for the azimuth mark, which is west of the station (and on the opposite side of the road) on another knoll. This turned out to be a very exciting find! Not only did we find a wooden plank at the site, perhaps part of an old tripod or witness sign, but we also found the remains of some old batteries! They appear to be the type that could have illuminated a target light for surveying from a distance. We thought it was so cool how this had been preserved for decades by the dry desert conditions! Like the station and reference marks, the azimuth mark is in very good condition.

A report on the condition of this survey mark has been submitted to NGS, along with the following recovery note:

The station, both reference marks, and the azimuth mark were recovered in good condition. The land is now part of Organ Pipe Cactus National Monument.

Handheld GPS WAAS-corrected coordinates for the azimuth mark are 31 59 19.0(N) 112 45 46.4(W).

Reference Objects
Designation Status Condition Image
LOW HILL AZ MK Recovered Good NGS Azimuth Mark Disk LOW HILL AZ MK
LOW HILL RM 1 Recovered Good NGS Reference Mark Disk LOW HILL RM 1
LOW HILL RM 2 Recovered Good NGS Reference Mark Disk LOW HILL RM 2

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