Visitors to the South Unit may experience up to 30 minute delays and rough road conditions due to road construction along East River Road. Check at South Unit Visitor Center for current road conditions. Updated 07/09/2014 5:16 pm MT
Did You Know?
Cannonball concretions can be found along the North Unit Scenic Drive. They were formed by the selective precipitation of mineral-rich groundwater and are nearly spherical because the sandstone in which sand grains were cemented together was of uniform permeability. More...