In 1967 there were no taxable buildings erected on the island, but after one of the four landowners began subdividing and selling lots, seasonal residences were built.

22.25 acres (9.00 ha) adjacent to two of the state park parcels are owned by the Door County Land Trust and are open to the public as part of the Detroit Harbor Nature Preserve.

[8][3] The current purpose of the state park is to "maintain public access to provide opportunities for hunting, fishing, trapping, walking, wildlife watching and nature study and other compatible nature-based outdoor recreation activities.

[10] The state park includes areas mapped as "upland deciduous forest" and "open wetland/marsh".

[11] 148.65 acres (60.16 ha) on the southeast side is part of the Green Bay National Wildlife Refuge.