In this Monday, Dec. 31, 2018 photo provided by Dakota Snider shows a road lined with trash in Yosemite National Park, Calif. Human feces, overflowing garbage, illegal off-roading and other damaging behavior in fragile areas were beginning to overwhelm some of the West's iconic national parks on Monday, as a partial government shutdown left the areas open to visitors but with little staff on duty. (Dakota Snider via AP)