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On February 6, 2012, I participated in a hike from the Eastlake district of Chula Vista to the summit of Mt. Miguel sponsored by the Take a Hike group on meetup.com.
The latitudes and longitudes were taken as waypoints in the GPS, so there are very few annotations.
The trail appears to be an unofficial "social" trail, and it goes straight up to the summit with very few switchbacks. This makes it very steep and subject to erosion in some places. It is a difficult ascent, and an even more difficult descent. A well-designed trail, with lots of switchbacks, would make the hike much easier.
The lower "trailhead" is on the north side of Proctor Valley Road at N 32 39.754 W 116 56.873. The summit "trailhead" is at N 32 41.749 W 116 56.189.
After the hike, I drove and surveyed Proctor Valley Road east as far as Highway 94, mostly for alignment. The topographic map is out of date, but Proctor Valley Road apparently hasn't been re-routed.
Transcript of survey.
Data plotted on topo
Philip J. Erdelsky