Map Keweenaw Underwater Preserve , Houghton, MI 49931 Add To Trip WebsiteUS Toll Free: (800) 338-6660 Description In addition to shipwrecks, the Keweenaw is a popular area for exploring underwater geologic formations. Large deposits of copper can be found in this region. Visibility throughout this preserve is generally very good and often exceeds 35 feet. Videos TripAdvisor® Traveler Reviews More To Explore Categories: Outdoors Diving & Snorkeling Attractions Recreation City: Houghton Region: Western UP Although the MEDC uses reasonable efforts to maintain the accuracy of the website content, it is not represented to be error free. Read legal information.