The National Oceanic and Atmospheric Administration established Thunder Bay National Marine Sanctuary and Underwater Preserve in 2000. It became the thirteenth overall and first on the Great Lakes. Original boundaries followed that of Alpena County to 83 degrees west longitude totaling 448 square miles (1,160 km2). In 2014 it was expanded to 4,300 square miles (11,000 km2).[2] The marine sanctuary contains many shipwrecks, such as the hull of package freighter SS Pewabic.
Great Lakes Maritime Heritage Center
Tied to the sanctuary is the Great Lakes Maritime Heritage Center. The museum, located in Alpena on the Thunder Bay River, features exhibits about local shipwrecks and the Great Lakes, an auditorium, an archaeological conservation lab, and education areas.
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