Passing Elk Plain and suburban areas, the highway enters Spanaway near the Fort Lewis boundary where SR 7 intersects SR 507, which continues southwest to Chehalis. The Mountain Highway becomes Pacific Avenue and enters Parkland. Shortly after 112th Street, the roadway has a partial cloverleaf interchange with SR 512, which uses 108th Street South as two ramps. Leaving Parkland and entering Tacoma, Pacific Avenue turns east as 38th Street and then has another partial cloverleaf interchange with a short freeway and the proposed route of SR 7, which is used by the roadway. The freeway was the busiest segment of the highway in 2007, with an estimated daily average of 27,000 motorists. The median of the freeway is the Tacoma Rail route and at the northern terminus is an interchange with Interstate 5 (I-5). SR 7 ends at the interchange, located near the Tacoma Dome, but continues north parallel to the railroad to a single-point urban interchange with SR 509 as I-705.