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Washington State Route 4
State Route 4 (SR 4) is a state highway, serving the southwestern region of the U.S. state of Washington. The highway, officially known as the Ocean Beach Highway, travels east along the Columbia River from U.S. Route 101 (US 101) at Johnston's Landing through Pacific, Wahkiakum and Cowlitz counties to an interchange with Interstate 5 (I-5) in Kelso. SR 4 is designated as part of the Lewis and Clark Trail Scenic Byway, a state scenic byway, as well as part of the National Highway System. The highway, along with I-5 and SR 14, forms the former route of US 830, which ran along the Columbia River from Johnston's Landing to Maryhill from the creation of the United States Numbered Highways in 1926 until 1968. US 830 was co-signed with Primary State Highway 12 (PSH 12) from Johnston's Landing to Kelso and was created in 1937 as the successor to various unsigned state highways.
==Route description==
SR 4 begins at an intersection with US 101 at Johnston's Landing, located on the Naselle River in rural Pacific County. The highway, designated as the Lewis and Clark Trail Scenic Byway, travels southeast along the Naselle River and serves as the northern terminus of SR 401 in the census-designated place of Naselle before leaving the Naselle River. SR 4 continues east along Salmon Creek and the Deep River into Wahkiakum County before it intersects the former route of SR 403 in Rosburg. The highway travels upstream along the Grays River and turns southeast towards Skamokawa, passing east of the Julia Butler Hansen Refuge for the Columbian White-Tailed Deer on the shores of the Columbia River. SR 4 continues east through the county seat of Cathlamet and intersects the former terminus of SR 407 and the northern terminus of SR 409. The highway travels into Cowlitz County and intersects the western terminus of SR 432, which serves the Port of Longview, in West Longview. SR 4 continues through the northern part of Longview and passes the campus of the Lower Columbia College before traveling onto Cowlitz Way. Cowlitz Way intersects the former spur route of SR 411 and crosses over SR 411 and the Cowlitz River into Kelso before SR 4 splits into a one-way pair traveling south through downtown Kelso. SR 4 turns east onto Allen Street and continues to its eastern terminus, a diamond interchange with I-5 north of the Three Rivers Mall.〔
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 SR 4 was the intersection with Catlin Street in Kelso west of the Cowlitz Way Bridge, serving 34,000 vehicles, while the least busy section was between Rosburg and Cathlamet in rural Wahkiakum County, serving 1,000 vehicles. The entire route of SR 4 is designated as part of the National Highway System, a highway system that includes roadways important to the national economy, defense, and mobility; and as a Highway of Statewide Significance by WSDOT from US 101 at Johnston's Landing to SR 432 in West Longview, which includes highways that connect major communities in the state of Washington.
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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