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On March 21, 2010, I participated in a hike around Lake Calavera led by the San Diego Natural History Museum Canyoneers.
There are a lot of trails, both formal and informal, in that area. I will have to return for further surveys.
Most of the streets in this area were built after the topo was compiled.
Transcript of survey.
Data plotted on topo
Philip J. Erdelsky