Isle Royale is serviced by passenger ferries during the summer months – two from Michigan (Copper Harbor and Houghton) and one from Minnesota (Grand Portage). While most visitors come by ferry, it is also possible to get to the island via floatplane or private boat. If you choose to make the crossing on your own vessel, make sure that you and your boat are up to the hazards of the crossing. A passage across Lake Superior can be just as dangerous as any voyage on the open ocean.