2015.065.058
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 of two freighters passing in the St. Mary's River, east of the Soo Locks. A 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."
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