There have been two different routes numbered SR 113 at different times since the current state route numbering system was first posted in 1964.
Earlier RouteWhen the present state highway numbering system was first posted in 1964, SR 113 began at Jct US 101 at Discovery Bay and headed NE to Port Townsend. SR 113 crossed Admiralty Inlet via the Port Townsend-Keystone Ferry. From Keystone, SR 113 headed east for a few miles to Jct SR 525, where SR 113 ended. In September 1972, the final link in the North Cascade Highway (SR 20) was completed. The following year, the SR 20 designation was extended west to Jct US 101 at Discovery Bay. SR 113 was renumbered SR 20.
Before 1964, the state highway from Discovery Bay to Port Townsend had been the Port Townsend branch of PSH 9. The Keystone to SR 525 highway had been a branch of SSH 1D.
Later RouteSR 113 from Jct US 101 at Sappho to Jct SR 112 a few miles south of Clallam Bay was added to the state highway system on April 1, 1992. This route had been part of SSH 9A from 1937 to 1955. Today, SR 113 is 9.98 miles long.
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