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.