Work began Monday, April 13, on U.S. Highway 12 from Mobridge west approximately 15 miles and on S.D. Highway 1806 both north and south of Highway 12. The Highway 12 project will primarily involve pipe and guardrail corner improvements on the shoulders of the highway.On Highway 1806 north of Highway 12, work will include mainline pipe installations and short grading sections. Traffic wil...