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State Route 9 (SR 9) is a long state highway traversing three counties, Snohomish, Skagit and Whatcom, in the U.S. state of Washington. The highway extends north from an interchange with in the vicinity of Woodinville north through Snohomish, Lake Stevens, Arlington, Sedro-Woolley and Nooksack to become (BC 11) at the Canadian border in Sumas. Three other roadways are briefly concurrent with the route: in Arlington, in Sedro-Woolley and near Deming. A spur route in Sumas serves trucks traveling into British Columbia. Before SR 9 was created, several other roads used the route of the current highway. The first was a roadway extending from the current southern terminus to Snohomish established by 1895 and another road between Arlington and Sedro-Woolley by 1911. The current SR 542 concurrency was first established in 1925, when a branch of from Bellingham to Mount Baker was added to the state highway system. These roads were combined and several other roads were added to create Secondary State Highway 1A (SSH 1A), which originally ran from Woodinville to Blaine in 1937. A branch of SSH 1A connected the mainline to the Canadian border in Sumas, but was later included into SSH 1A when the Blaine to Sumas segment was deleted in 1953. A highway renumbering in 1964 introduced the sign routes that would be co-signed with the existing system until 1970, one of which would replace SSH 1A, SR 9. SSH 1A / SR 9 extended south to Woodinville until 1965, when it was shortened to , later SR 522, which wasn't complete yet. SR 9 was not complete between Lake Stevens and Arlington until after 1966. Between 2004 and 2009, nine complete construction projects, arranged by the Washington State Department of Transportation (WSDOT), have improved the roadway. The projects ranged from expanding the current weigh station at the Sopher Hill Road intersection in 2005 to realigning the highway between Nooksack and Sumas in 2006 to eliminate 90-degree turns. WSDOT is also widening SR 9 in Snohomish County from 2 lanes to a four-lane divided highway. Between 2009 and 2013, WSDOT plans to complete six other projects in Snohomish County to improve the corridor from SR 522 to Bryant. Some projects include widenings, adding a roundabout at , realignments south of Snohomish and the addition of web cameras. ==Route description== State Route 9 (SR 9) originates as the Snohomish–Woodinville Road at a partial cloverleaf interchange with north of Woodinville. Temporarily paralleling a BNSF rail line, the highway intersects in Maltby. After SR 524, the roadway passes several residential communities in Clearview and Cathcart. Shortly after leaving Cathcart, terminates at the road. SR 9 passes Harvey Airfield and crosses another BNSF rail line and the Snohomish River to enter Snohomish. North of the Snohomish River Bridge, the highway encounters a diamond interchange with 2nd Street and Riverview Road and turns northeast to intersect Bickford Avenue, which once was (US 2).〔 Curving north out of Snohomish, the route interchanges with US 2 in a modified diamond interchange, with a westbound US 2 offramp routed onto New Bunk Foss Road. In suburban West Lake Stevens near the Lake Stevens shoreline, ends at the highway. After the intersection, the roadway had an estimated daily average of 25,000 motorists in 2007, making this stretch of road the busiest on the whole highway. SR 9 also forms the western boundary of Lake Stevens and the eastern boundary of Marysville while passing a weigh station and the junction. After Lake Cassidy, the road intersects and continues into North Marysville, where the roadway passes over the Snohomish County Centennial Trail. After passing , several residential subdivisions, Pioneer Elementary and Arlington High School, the highway enters downtown Arlington as Hazel Street. After a brief concurrency with , SR 9 crosses the Stillaguamish River and passes Bryant to enter a heavily forested area and leave Snohomish County. Entering Skagit County, the highway continues northwest through a large forest to Lake McMurray, where it intersects and encounters the Lake McMurray Store, established in 1889. Passing Big Lake and its community of the same name, the roadway serves Big Lake Elementary before intersecting at a roundabout. Turning northeast to Clear Lake and Clear Lake Elementary, the route crosses the Skagit River into Sedro-Woolley. In Sedro-Woolley, the street becomes concurrent with and is named Moore Street. At the end of the concurrency, the road turns north as Township Street, paralleling another BNSF rail line,〔 at Cascade Middle School. Continuing north out of the city and into rural areas, SR 9 passes Samish Elementary, crosses the Samish River and exits rural Skagit County.〔〔 The highway enters Whatcom County in a valley located east of Lake Whatcom. Passing Acme and crossing the Nooksack River, the roadway becomes concurrent with in Deming. Traveling west with SR 542 along the Nooksack River, the road splits in Cedarville and continues north through a series of 90-degree turns in a plain located near the Sumas River. In Nooksack, the route becomes Nooksack Avenue and encounters , named Main Street, which travels west to Everson. North of Nooksack, SR 9 intersects in a rural area and travels northeast along the Sumas River to Sumas. In Sumas, ends at SR 9 and a spur route that serves trucks branches off and SR 9 terminates at the Canadian border. The road continues north from the Canadian border, through Abbotsford, BC to (BC 1), as .〔〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Washington State Route 9」の詳細全文を読む スポンサード リンク
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