A state highway to be known as state route number 20 is established as follows:

Beginning at a junction with state route number 101 in the vicinity of Discovery Bay, thence northeasterly via the most feasible route to Port Townsend; also

From the state ferry terminal at Port Townsend via the state ferry system northeasterly to the state ferry terminal at Keystone; also

From the Keystone ferry dock on Whidbey Island, thence northeasterly by the most feasible route by way of Deception Pass, Burlington, Sedro Woolley, Concrete, Newhalem, Winthrop, Twisp, Okanogan, Tonasket, Republic, Kettle Falls, Colville, and Tiger; thence southerly and southeasterly to a junction with state route number 2 at Newport.