Wash. Rev. Code § 47.20.710
The department of transportation is authorized to enter into a cooperative agreement with the governing authority for the Indian peoples of the Quinault Indian Reservation and appropriate agencies of the United States for the location, design, right-of-way acquisition, construction, and maintenance of a highway beginning at the south boundary of the Quinault Indian reservation on state route number 109, thence northerly along the present right-of-way of state route number 109 to the township line, thence inland and northerly across the Raft river to an intersection with state route number 101 south of Queets. The highway shall be known as the "Tribal Highway" and may also be designated by the department as state route number 109. It is anticipated that this highway construction will be funded from federal sources other than normal federal aid highway allocations.
RCW 47.20.710
State route number 109: RCW 47.17.200.