The soo Locks close for the year according to this newstory by MLive
SAULT STE. MARIE, MI — The Great Lakes shipping season is officially over for the next couple months, ending a tough year for Midwest iron ore mines and the ships that carry taconite for steel mills.
On Friday, Jan. 15, the Soo Locks close on the St. Mary’s River in Sault Ste. Marie — an annual tradition that allows the complex to get a jump on winter maintenance before shipping ramps up again with the locks re-opening March 25.
The Soo Locks are the last Great Lakes locks to close each year. On Dec. 30, the Welland Canal through Ontario closed. On Dec. 31, the St. Lawrence Seaway locks on the St. Lawrence River closed.
Lock closures generally coincide with the start of icebreaking, a tame labor thus far this year with ice buildup mostly limited to bays, inlets and rivers around the lakes. Across the basin, the total Great Lakes ice cover is about 6.6 percent. Read rest of story