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Mark Island Lighthouse Fun Facts
Location: Mark Island
Closest City: Stonington, Maine
Latitude: 44.13397 Longitude: -68.7032
Body of Water: Deer Island Thorofare
Open to Public: No
Station Established: 1858
Present Tower Activated: 1858
Status of Light: Operational
Tower Height: 25 ft.
Optic: 250 mm, Solar Powered, 1960
Fourth Order Fresnel, 1858
National Register Reference #: Not Listed
Listing Name: N/A
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The Mark Island light (also commonly known as the Deer Island Thorofare light) was built in 1858 on the west side of Mark Island to light the western approach to the Deer Island Thorofare. The sound signal building, boathouse, and oil house previously resident at this site were all demolished in the 1970s. The original keeper's residence was destroyed by fire in 1959. In spite of all this destruction, the light remains an active aid to navigation. Its original fourth order Fresnel lens was replaced with a solar-powered 250mm optic in 1960. The original fog horn (1884) is still active as well.
Located roughly two miles southwest of Stonington and accessible only by boat, the lighthouse is owned and operated by the Island Heritage Trust in Deer Isle and is part of a bird sanctuary. As such, the site is closed to the public.
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