The Undersea Co. of Port Townsend began the work March 17, cutting up and airlifting out pieces. Company President John Nesset says it was like opening a 185-ton concrete package filled with foam packing peanuts.
The job was finished Thursday.
Japan paid most of the $628,000 removal cost. A serial number showed the dock came from Aomori Prefecture during the March 2011 tsunami. A similar dock was removed last summer from a beach at Newport, Ore.
The Washington dock landed within a wilderness portion of Olympic National Park and also within the Olympic Coast National Marine Sanctuary.