High Quality Content by WIKIPEDIA articles! State Route 339 (SR 339) is a 8.5-nautical-mile-long (9.8 mi; 15.7 km) ferry route designated as a state highway in the U.S. state of Washington. It connects Vashon Island`s Vashon Heights ferry terminal to downtown Seattle`s Pier 50, via a passenger-only ferry, the MV Skagit. The ferry is financed by the King County Ferry District (KCFD) and tolls collected at Pier 50. Despite being part of the KCFD, the ferry is operated by Washington State Ferries (WSF). SR 339 is one of only four ferry routes providing access to and from Vashon Island, and has the lowest annual average ridership of the four routes. The state of Washington took over the operation of the ferry route in 1951, and designated it SR 339 in 1994.