Washington State ferry at Clinton dock, Whidbey Island, WA Ferry "Cathlamet" in dock after crossing Possession Sound from Mukilteo. 2004. Photo by Ron Kerrigan (WhidbeyIslander) Category:Images of Washington Washington State ferry at Clinton dock, Whidbey Island, WA Ferry "Cathlamet" in dock after crossing Possession Sound from Mukilteo. 2004. Photo by Ron Kerrigan (WhidbeyIslander)