At Cloudburst Summit we encountered an unforeseen obstacle. Part of the Pacific Crest Trail was closed because of the presence of the endangered Mountain Yellow-Legged Toad. Also because of the toad, the Angeles Crest Highway was closed just west of Eagle's Roost Picnic Area, rather than at Islip Saddle, as we had been told. Our plans for the day, therefore, had to be altered. We followed the Pacific Crest Trail into Cooper Canyon in order to see the falls, then came back up to the Angeles Crest Highway on the Burkhart Trail detour. We had to end our hike at Eagle's Roost Picnic Area because the shuttle car could go no farther.