When first posted as such in 1964, SR 160 began at Jct SR 16 west of Port Orchard and headed east to the Washington State Ferry terminal at Southworth. Effective April 1, 1992, SR 160 was switched to a more southerly route from SR 16 to Southworth via Sedgewick road. This route bypasses Downtown Port Orchard. In 1994, the Southworth-Vashon-Fauntleroy ferry route was explicitly made a part of SR 160. Former SR 160 from SR 16 via Downtown Port Orchard to the east city limits was added back to the state highway system in 1993 as SR 166. SR 160, excluding the ferry route, is 7.47 miles long.
Before 1964, the route that became SR 160 via Downtown Port Orchard to the Southworth ferry terminal was PSH 14.
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