Problems with sediment loads have officials from Olympic National Park and the City of Port Angeles collaborating on ways to ensure the city's water supply isn't harmed from work to remove the Glines Canyon Dam on the Elwha River.

A day after it was closed by a rain storm, the Zion-Mount Carmel Highway at Zion National Park reopened Thursday, although motorists were cautioned to expect a section of rough road.

Heavy rains that have been pounding eastern Colorado have been creating some problems at Rocky Mountain National Park, where interior park roads have been closed by the deluge.

Unless things change, it will take centuries for many national parks to have truly clean air, according to the National Parks Conservation Association, which wants the Obama administration to close loopholes that stand in the way of improving air quality.