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Cape Decision Light
USCGCape Decision.jpg
Cape Decision Light is located in Alaska
Cape Decision Light
Cape Decision Light
Location in Alaska
Location Southwestern extremity of Kuiu Island, Alaska
Coordinates 56°00′05″N 134°08′09″W / 56.001463°N 134.135822°W / 56.001463; -134.135822
Year first lit 1932
Automated 1974
Foundation Rock
Construction Concrete
Tower shape square tower on building
Height 75 feet (23 m)
Original lens Third order Fresnel lens
Current lens Solar powered aero beacon
Range 18 nautical miles (33 km; 21 mi)
Characteristic flashing White 5s, Obscured from 134° to 245°. Emergency light (Fl W 5s) of reduced intensity if main light is extinguished.
Admiralty number G6286
ARLHS number ALK-001
USCG number 6-1020

Cape Decision is a lighthouse located on Kuiu Island adjacent to Sumner Strait in Southeast Alaska.


The first attempt to light these waters was an acetylene lantern placed on the Spanish Islands, just off the southern end of Kuiu Island. The lantern was proved ineffective and consequently Congress appropriated $59,400 in 1929 for a lighthouse and construction began in September of that year. However, weather and inadequate funds delayed the completion of the station until it finally became active in March 1932. The total cost ended up in excess of $150,000. The lighthouse became automated in 1974 and in 1989 fire damaged the tram, dock, boathouse, hoist house, paint shed, and helipad. The original third order Fresnel lens was replaced in 1996 with solar powered aero beacon. The lens is on display in Clausen Museum in the nearby community of Petersburg.

The lighthouse was added to the National Register of Historic Places in 2005.

It is currently an active aid to navigation. The lighthouse is currently owned and maintained by the Cape Decision Lighthouse Society.

Cape Decision Lighthouse Society

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