Iargo Springs in Oscoda, Michigan, features several viewing decks and a boardwalk path through the natural springs. Natural springs are formed from water that naturally flows to the surface from underground. The natural springs can be accessed from the road by stairs leading down to the Au Sable River. Man-made barriers pool the springs and create small waterfalls. The wooden boardwalk stretches over 1,000 feet (300 m) as it winds through the natural springs.