SR 704 was added to the state highway system by the 2002 session of the state legislature. This route, sometimes called the Cross Base Highway, is proposed. If or when built, SR 704 would begin at I-5 in the Tillicum District of the City of Lakewood and head easterly in the vicinity of the boundary between Fort Lewis and McChord AFB, ending at Jct SR 7 at or near S 176th Street in Spanaway. This route would be approximately 6 miles long.
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