The answer is NO! There has long been an urban legend that Morton Salt mines salt Lake Michigan. This video addresses this myth.
Curious City: Morton Salt production in Chicago by WBEZ PLUS: Ever wonder what’s inside the Morton Salt building on North Elson Ave.? One Curious City question prompted us to find out. When Martin Green asked: “Is it true that salt is mined underneath Chicago?” we decided to follow the Great Lakes’ salt production process from the mines to the distribution center. Here’s what happens in Chicago.
Curious City: Morton Salt production in Chicago from WBEZ on Vimeo.