Big Bay State Park is a state park of Wisconsin, United States, on Madeline Island, the largest of 22 Apostle Islands in Lake Superior. The park has picturesque sandstone bluffs and caves and a sand beach. It encloses unique habitat types including lakeside dunes, sphagnum bogs, and old-growth forest. Bald eagles return annually to the park to nest and rear offspring.
The park offers picnicking, camping, and more than of trails, including nature trails. The park is open year-round, with winter visitation mostly limited to hunters, snowshoers, and cross-country skiers.
Reaching the park requires a 20-minute ferry ride from Bayfield, Wisconsin, and traveling approximately east on Highway H.
Big Bay State Park is 1 of 3 Wisconsin State Parks that one would have the best view the Milky Way from, in regards to available Wisconsin State Parks.