Cass County Emergency Management Coordinator Mike Kennon reminds area residents and motorists, that a bridge construction project on U.S. Highway 71 over Lone Tree Creek, 3.1 miles south of Atlantic and 0.1 miles south of Cass County Road G-35, required closing of the roadway to traffic from now until later this summer. The official detour will route traffic using Hwy 92, Hwy 148 and Hwy 83.