Patos Island Light

Infobox Lighthouse


caption =
location = San Juan Islands, Washington
coordinates = coord|48.789|N|122.9715|W
yearlit = 1908
automated = 1974
yeardeactivated =
foundation = Surface
construction = Wood
shape = Square
height = ft
lens = Fourth order Fresnel lens
range =
characteristic =

Patos Island Lighthouse is a lighthouse at Alden Point on the western tip of Patos Island in the San Juan Islands off the coast of Washington state in the north-west of the United States.

The original light station was a post light and third-class Daboll trumpet fog signal. Beginning operation on November 30, 1893, the light was used as a navigational aid to steamships traveling from Nanaimo, British Columbia to Alaska.

The lighthouse was improved in 1908 with a new fog signal and a 38-foot tower, which housed a fourth-order Fresnel lens. The light was automated in 1974. Today, it flashes a white light once every six seconds. The fourth-order Fresnel lens, is now in private ownership in Oregon.