Mystery Bay State Park, Marine park at Marrowstone Island, United States
Mystery Bay State Park is a nature reserve on Marrowstone Island with direct waterfront access. The park includes boat docks, a launch ramp, mooring buoys, restrooms, and drinking water for visitors.
Mystery Bay State Park covers eighteen acres on a small inlet off Scow Bay and Kilisut Harbor, on the western side of Marrowstone Island in Jefferson County. The sources record no naming date or Prohibition smuggling history for the bay, so the park's story is one of a protected marine shoreline rather than a named event.
Mystery Bay takes its name from local lore rather than any documented event. The inlet off Scow Bay and Kilisut Harbor holds permanent moorage where many older wooden sailboats swing at anchor, a sight tied to the shellfish harvesting, fishing and boating that visitors and islanders still practice here.
The beach has a gentle slope that makes launching and landing small boats straightforward. Visitors should keep tides in mind and note that conditions can change depending on the weather.
The park covers 18 acres (7.3 ha) on a small inlet off Scow Bay and Kilisut Harbor, about half a mile north of the Nordland General Store on Flagler Road (SR 116). Its shoreline sits roughly 5 metres above sea level, and the land around it is flat.
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