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On July 5, 2012, I surveyed Swan Canyon on my mountain bike. I had to walk most of the trails, but the bike provided mobility on the surrounding streets. On July 14, I returned to survey three nearby canyons in the same way. They were 47th Street, Pepper and Manzanita Canyons.
I overlaid the July 14 survey over the July 5 survey. In this way, I've managed to cover most of the trails in the four canyons in this area.
The topo is overlaid, not only with trails covered in these surveys, but also with streets and alleys in the area.
There is at least informal canyon access from the ends of surrounding streets, especially streets that are interrupted by the canyon. In most such cases, the city owns the right of way in the canyon, so there are no houses to block access to the canyon.
The principal access to 47th Street Canyon is at the south end on the west side of Euclid Ave. (N 32 44.295 W 117 5.544). There is a more difficult access point at the east end of Thorn Ave. (N 32 44.419 W 117 5.632). Other access points are noted, but they involve steep descents along rough trails.
The Azalea Park area has two canyons, Manzanita Canyon and the smaller Pepper Canyon (erroneously called Hollywood Canyon in previous surveys because Hollywook Community Park is at its south end).
An apparent side trail in Manzanita Canyon going north to Marlborough Ave. is probably due to a recording mistake. I do not recall the trail.
Apparent breaks or jogs in some streets just south of Thorn Ave. are due to misalignment of two topos.
Transcript of survey.
Data plotted on topo
Philip J. Erdelsky