Major rivers are surging again, closing Minneapolis locks on the Mississippi and triggering no-wake boating rules on the St. Croix.
The three locks will close to recreational boats Friday at 10 a.m., the St. Paul District of the U.S. Army Corps of Engineers said Thursday. The Corps anticipates closing the locks to commercial traffic sometime this weekend.
The Upper St. Anthony Falls and Lower St. Anthony Falls lock and dams in downtown Minneapolis, and Lock and Dam 1 next to Minnehaha Park in Minneapolis, close to recreational traffic when flows pass 30,000 cubic feet per second, or cfs. They close to commercial traffic when flows exceed 40,000 cfs.
It could be a week or longer before locks reopen, the Corps said.
On the St. Croix, signs will go up Friday in preparation for Sunday's projected 683-foot level, the elevation when the no-wake rules take effect. By then the river will have risen four feet in five days.
The St. Croix will be dangerous this weekend with fast currents and floating debris, the Minnesota Department of Natural Resources said Thursday.
Water backing up from the Mississippi River caused much of the rapid rise, the agency said.
The St. Croix drains into the Mississippi at Prescott, Wis., just east of Hastings.