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State Route 503 (SR 503) is a state highway serving Clark and Cowlitz counties in the U.S. state of Washington. The highway travels north from a short concurrency with SR 500 in Orchards through Battle Ground, the eastern terminus of SR 502, and communities in rural Clark County before crossing the Lewis River on the Yale Bridge. SR 503 intersects its spur route and turns west to parallel the Lewis River downstream to Woodland, where the highway ends at an interchange with Interstate 5 (I-5). The highway was part of the Lewis River Road, signed as State Road 15, from 1909 until 1919. The current route of SR 503 was split between Secondary State Highway 1S (SSH 1) from Woodland to Battle Ground and SSH 1U from Battle Ground to Orchard in 1937, combined to form SR 503 during the 1964 highway renumbering. A spur route, established in 1991, travels northeast into the Gifford Pinchot National Forest along Yale Lake, serving the community of Cougar. ==Route description== SR 503 begins concurrent to SR 500 at an intersection with Fourth Plain Road in Orchards. The two highways travel north on the four-lane 117th Avenue through Orchards until SR 500 turns east onto Padden Parkway, while SR 503 continues north into rural Clark County, passing Prairie High School. The roadway bypasses Brush Prairie on its west side and crosses a the Chelatchie Prairie Railroad, before it turns northeast onto 122nd Avenue. SR 503 enters Battle Ground as 10th Avenue and intersects the eastern terminus of SR 502 west of Battle Ground High School. The highway crosses the East Fork of the Lewis River and leaves Battle Ground to pass Lewisville Park, listed on the National Register of Historic Places and located in Lewisville. SR 503 continues heading northeast into a heavily forested region of the Cascades foothills, toward Fargher Lake and Amboy. SR 503 turns east onto Fargher Lake Highway at Rock Creek and enters Amboy by following Chelatchie Creek towards Yale Lake. The highway travels north and crosses the Lewis River into Cowlitz County on the Yale Bridge. The one-lane warren truss bridge, listed on the National Register of Historic Places, is located downstream from the Yale Dam on Yale Lake and upstream of Lake Merwin. SR 503 continues into Cowlitz County and turns west onto Lewis River Road at an intersection with its spur route that heads east to Skamania County. The highway travels southwestward in the Lewis River valley and passes through the communities of Yale and Ariel. SR 503 enters Woodland and turns south onto Goerig Street before ending at a diamond interchange with I-5 near the confluence of the Lewis and Columbia rivers.〔〔 Every year, the Washington State Department of Transportation (WSDOT) conducts a series of surveys on its highways in the state to measure traffic volume. This is expressed in terms of average annual daily traffic (AADT), which is a measure of traffic volume for any average day of the year. In 2011, WSDOT calculated that the busiest section of the highway was the SR 500 concurrency in Orchards, serving 34,000 vehicles, while the least busiest section was at the western terminus of SR 503 Spur east of Yale, serving 720 vehicles. SR 503 between Orchards and Battle Ground is designated as part of the National Highway System, which includes roadways important to the national economy, defense, and mobility. 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 503」の詳細全文を読む スポンサード リンク
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