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On December 11, 2010, I participated in a hike around Mountain Palm Springs led by the San Diego Natural History Museum Canyoneers, which followed the route described in Jerry Schad's Afoot & Afield in San Diego County.
After the hike, I surveyed a small part of Highway S2 and the access road for Bow Willow Campground.
Transcript of survey.
Data plotted on topo
Philip J. Erdelsky