An invasive alga known as didymo, or "rock snot," was discovered in Michigan's Au Sable River, raising concerns with environmentalists and the local fishing community.
"Calling on Michigan" is an MGM film short from "TravelTalks", one in a series about places around the country and around the world. This is a mid-20th century look at Michigan, in color.
Located in the Huron National Forest, just off the River Road Scenic Byway, Iargo Springs is where waters once-believed to be sacred flow to the Au Sable River.