This image provided by the National Park Service shows workers searching a snow-blocked Sylvan Pass inside Yellowstone National Park May 11, 2011 in Montana. Sylvan Pass - which connects Fishing ... more 
This image provided by the National Park Service shows workers searching a snow-blocked Sylvan Pass inside Yellowstone National Park May 11, 2011 in Montana. Sylvan Pass - which connects Fishing Bridge to the park's east entrance - remained closed for the third straight day Friday May 13, 2011 because of multiple snow slides onto the road. The slopes on either side of the road are covered by deep fields of heavy, wet snow. less 
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Associated Press | Photo By National Park Service
Fri, May 13, 2011 5:05 PM EDT