http://www.newsmeback.com/story.php?title=rain-heat-opens-deep-colorado-highway-sinkhole-100-year-old-railroad-tunnel U.S. Highway 24 near Leadville, Colo. is closed indefinitely after heat combined with recent heavy rainfall caused a large and deep sinkhole to open. Tue, 10 Jul 2012 19:07:50 CDT en