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Washington State Route 7
State Route 7 (SR 7) is a state highway in Lewis and Pierce counties, located in the U.S. state of Washington. The long roadway begins at (US 12) in Morton and continues north to intersect several other state highways to Tacoma, where it ends at an interchange with (I-5) and . 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.
The earliest road to use the current route of SR 7 first appeared in a 1900 map of the Tacoma area and has been part of the state highway system since 1909, when the Alder-Kosmos Road was added to the system as . State Road 18 became part of two branches of in 1923 and later branches of . During the 1964 highway renumbering, the branches became SR 7. In 2002, an auxiliary route that bypasses Tacoma, , was established and construction started in 2008 to connect I-5, Fort Lewis, McChord Air Force Base and SR 7.
==Route description==
State Route 7 (SR 7) begins at an intersection with (US 12), a major east–west highway, in Morton. Traveling north as Second Street and paralleling the Morton – Tacoma (Mountain Division) route of Tacoma Rail,〔 the street intersects Main Avenue, which continues west out of the city as . After leaving Morton, the highway becomes the Mountain Highway and passes through a heavily forested canyon near Mount Rainier and parallel to the Tilton River and Roundrop Creek. Bridging the Nisqually River, the highway leaves Lewis County and enters Pierce County. In Elbe, the roadway intersects , which goes east to Mount Rainier National Park. Following the Nisqually River, which has become Alder Lake, and Tacoma Rail line, branches off towards Eatonville and travels west from the plains to McKenna.
Passing Elk Plain and suburban areas, the highway enters Spanaway near the Fort Lewis boundary where SR 7 intersects , 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 , 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 (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 as .〔〔〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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