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On December 12, 2010, I participated in a hike to the Valley of the Moon sponsored by the Take a Hike group on meetup.com.
I'd hiked there several times before, never taking exactly the same route. The area is crisscrossed with dirt roads and trails.
After the hike, I surveyed a small part of Old Highway 80 and Interstate 8, mostly for alignment. Some of the data in the interchange appears to be erroneous.
Transcript of survey.
Data plotted on topo
Philip J. Erdelsky