 State Route 7 ( SR 7 ) is a state highway in Lewis and Pierce counties , located in the U.S. state of Washington . The 58 @.@ 60 @-@ mile ( 94 @.@ 31 km ) long roadway begins at U.S. Route 12 ( US 12 ) in Morton and continues north to intersect several other state highways to Tacoma , where it ends at an interchange with Interstate 5 ( I @-@ 5 ) and I @-@ 705 . The road has several names , such as Second Street in Morton , the Mountain Highway in rural areas , Pacific Avenue in Spanaway , Parkland and Tacoma and 38th Street in Tacoma . Near the end of the highway there is a short freeway that has been proposed to be extended south parallel to an already existing railroad , owned by Tacoma Rail , which serves as the median of the short freeway . 
