Miss. River Locks Reopen In Mpls. To Commercial TrafficMinneapolis' three major locks on the Mississippi River have reopened to commercial traffic Friday, according to the U.S. Army Corps of Engineers. The three locks – the Upper St. Anthony Falls, the Lower St. Anthony Falls and Lock and Dam 1 near Minnehaha Park – were closed to commercial traffic on June 4 due to dangerous water levels. Recreational traffic was prohibited on June 2.