FILE PHOTO: Visitors take in a scenic overlook off Trail Ridge Road, above tree-line at Rocky Mountain National Park, west of Estes Park, Colo., in July 2014.
FILE PHOTO: Visitors take in a scenic overlook off Trail Ridge Road, above tree-line at Rocky Mountain National Park, west of Estes Park, Colo., in July 2014. Brennan Linsley AP
FILE PHOTO: Visitors take in a scenic overlook off Trail Ridge Road, above tree-line at Rocky Mountain National Park, west of Estes Park, Colo., in July 2014. Brennan Linsley AP