Pottawatomie Lighthouse, also known as the Rock Island Light, is a lighthouse in Rock Island State Park, on Rock Island in Door County, Wisconsin. Lit in 1836, it is the oldest light station in Wisconsin and on Lake Michigan. It was served by civilian light keepers from 1836 to 1946, at which point it was automated.

History

The first lighthouse on the spot was a 1.5-story house and 30-foot (9.1 m) detached tower built in 1836. Due to poor construction, it was replaced by the existing lighthouse in 1858. The original tower and dwelling were demolished in subsequent years. The current building was first lit in 1858 and continued as an active aid to navigation until 1988, when it was replaced with a modern skeletal tower and automated system.

It is the oldest light station in Door County, which has the most lighthouses of any Wisconsin county.

The lighthouse was restored by the Friends of Rock Island Lighthouse. It is open for tours during the summer as the Pottawatomie Lighthouse Museum. The lighthouse has been restored to a state illustrating its appearance circa 1909–1913. The restoration was performed with the help from the non-profit Friends Of Rock Island State Park. It now serves as a museum that is open for tours daily from Memorial Day to Columbus Day 10am to 4pm.

The lighthouse was listed as Pottawatomie Lighthouse in the National Register of Historic Places in 1979, as reference #79000074. The fresnel lens, lost after the lighthouse was shut down in the late 1980s, was replaced by a plexiglass copy in 1999.

The original (1836) privy still stands on the grounds and is the oldest structure in Door County.

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