Michigan is no stranger to odd roadside attractions. It's a hydro-electric turbine; not something anyone would expect. This particular runner was in service from April 12th, 1973, to May 13th, 2019, and saw 150,000 hours of operation. Google Maps Google MapsThe nearby plaque also explains how the pumped storage system works and what role this huge turbine plays in the process. Michigan's Forgotten Amusement and Theme Parks Michigan's Adventure wasn't always the only game in town.