 This is Michiana's breaking news and weather station at 1019 FM, 1340 AM and mncnation.com. I'm Tommy Lee. MDOT is performing maintenance on six bridges this summer along U.S. 31 and one bridge on M139 at a cost of $746,000. The M139 bridge over the St. Joe River is first up with work lasting about five or ten days. The U.S. 31 bridges will take about a week each and one lane of traffic will remain open in each direction.