Natural Bridge State Park has a natural sandstone arch created by the eroding effects of wind and water. The bridge has an opening 25 feet high by 35 feet wide. This weathered formation, in Wisconsin's Driftless Area, was missed by the glaciers during the last Ice Age. Near the bridge is a rock shelter used by native people when the glacier was melting, 11,000 years ago. The park is for day use only. There is no camping at Natural Bridge. The park is open year-round from 6 a.m. to 11 p.m.