Washington Constitution Art. 4, § 5.

There shall be in each of the organized counties of this state a superior court for which at least one judge shall be elected by the qualified electors of the county at the general state election: Provided, That until otherwise directed by the legislature one judge only shall be elected for the counties of Spokane and Stevens; one judge for the county of Whitman; one judge for the counties of Lincoln, Okanogan, Douglas and Adams; one judge for the counties of Walla Walla and Franklin; one judge for the counties of Columbia, Garfield and Asotin; one judge for the counties of Kittitas, Yakima and Klickitat; one judge for the counties of Clarke, Skamania, Pacific, Cowlitz and Wahkiakum; one judge for the counties of Thurston, Chehalis, Mason and Lewis; one judge for the county of Pierce; one judge for the county of King; one judge for the counties of Jefferson, Island, Kitsap, San Juan and Clallam; and one judge for the counties of Whatcom, Skagit and Snohomish. In any county where there shall be more than one superior judge, there may be as many sessions of the superior court at the same time as there are judges thereof, and whenever the governor shall direct a superior judge to hold court in any county other than that for which he has been elected, there may be as many sessions of the superior court in said county at the same time as there are judges therein or assigned to duty therein by the governor, and the business of the court shall be so distributed and assigned by law or in the absence of legislation therefor, by such rules and orders of court as shall best promote and secure the convenient and expeditious transaction thereof. The judgments, decrees, orders and proceedings of any session of the superior court held by any one or more of the judges of such court shall be equally effectual as if all the judges of said court presided at such session. The first superior judges elected under this Constitution shall hold their offices for the period of three years, and until their successors shall be elected and qualified, and thereafter the term of office of all superior judges in this state shall be for four years from the second Monday in January next succeeding their election and until their successors are elected and qualified. The first election of judges of the superior court shall be at the election held for the adoption of this Constitution. If a vacancy occurs in the office of judge of the superior court, the governor shall appoint a person to hold the office until the election and qualification of a judge to fill the vacancy, which election shall be at the next succeeding general election, and the judge so elected shall hold office for the remainder of the unexpired term.