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Evaluations were made about the feasibility of constructing two tunnels through the Santa Ana Mountain Range which could carry 72,000 cars per day and allow for a commuter rail service between Corona and Irvine.
Aside from the large mammals including mountain lions, coyotes, and bobcats (the last California grizzly bear in the Santa Ana Mountains was shot near Trabuco Canyon) the creek was once a productive habitat for steelhead trout.