Postcard

The Soo Locks Sault Ste. Marie, Mich.

One postcard entitled "The Soo Locks Sault Ste. Marie, Mich." The postcard shows a color photographic aerial-view image of two freighters passing on St. Mary's River southeast of the Soo Locks. The freighter on the right belongs to the Ford Motor CompanyA caption on the verso reads, "In Michigan's Upper Peninsula. Lake freighters on their way to the Soo Locks. The Locks were built to overcome the 21 foot difference in water level between Lake Superior and Lake Huron."