Williamson Rock is a sheer granite wall that rises from chaparral in the San Gabriel Mountains National Monument. Crisscrossed with 300 routes, it has been a proving ground for Southern California rock climbers since the 1960s.
But in a move that outraged many in the climbing community, the area was shut down in 2005 to protect an isolated colony of federally endangered Southern California mountain yellow-legged frogs from being trampled.
http://www.latimes.com/local/california/la-me-reopen-williamson-rock-20181010-story.html
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