Washington State Route 411
State Route 411 (SR 411) is a state highway located in Cowlitz County in the U.S. state of Washington, serving Longview, Kelso, West Side Highway and Castle Rock. The roadway, which parallels the Cowlitz River and (I-5), begins at an interchange with in Longview and travels north past a spur route, under and across the Cowlitz River to become concurrent with and end at an interchange with I-5, I-5 Business and in Castle Rock. The road first appeared on a map in 1951 and originally signed as (SSH 12H) in 1957, SR 411 was established in  1964 and ran from Kelso to Vader. In 1991, the highway was extended south to SR 432 in Longview, the former route becoming SR 411 Spur, and was shortened to I-5 / I-5 Business / SR 504 in Castle Rock. Route description. State Route 411 (SR 411) begins at a partial cloverleaf interchange with in Longview, located northwest of the confluence of the Cowlitz and Columbia rivers. From the interchange, the highway travels north as 3rd Avenue to exit Longview and enter Kelso as First Avenue, where SR 411 Spur extends west from the main roadway to , which the road goes under  after SR 4 travels across the Cowlitz River. After leaving Kelso and temporarily reenters Longview, SR 411 parallels the Cowlitz River, a BNSF Railway route, the Columbia and Cowlitz Railroad and (I-5). After passing the community of West Side Highway, the highway turns east as PH No. 10 Road and crosses the Cowlitz River into Castle Rock. PH No. 10 Road becomes A Street and continues east to Huntington Avenue, signed as , where the roadway turns north, concurrent with I-5 Business, to end at a diamond interchange with I-5 and the western terminus of . The busiest segments of the road  in 2007 were the SR 432 interchange in Longview, SR 411 Spur intersection in Kelso and the Alpha Drive intersection in West Side Highway, all with an estimated daily average of 17,000 motorists. The Nevada Drive junction in Kelso was the busiest segment in 1970, with an estimated daily average of 6,800 motorists. History. The current route of SR 411 first appeared on a United States Geological Survey (USGS) map of Southwest Washington in 1951. (SSH 12H) was established in 1957 and ran from Kelso to Vader. During the 1964 highway renumbering, SSH 12H became SR 411, which ran from  in Kelso to east of Vader. In 1991, the highway was extended south to in Longview, the older section becoming SR 411 Spur, and shortened north into Castle Rock and ending at (I-5) and . Former Castle Rock—Vader route (1964—1991). Between 1964 and 1991, SR 411 was longer and extended north to Vader, a city in Lewis County. The former route started at an intersection with PH No. 10 Road west of Castle Rock and traveled north as the West Side Highway, paralleling a railroad, the Cowlitz River and I-5, into Lewis County to end at east of Vader. Between  Castle Rock and Vader, six different railroads have had ownership or usage rights that paralleled the former route. In the 1870s the Northern Pacific Railway, built the route. And by 1951, it was also in use by the Union Pacific and Great Northern Railway. By 1968, the Chicago, Milwaukee, St. Paul and Pacific Railroad had also been given usage rights, but as of 2008, the BNSF Railway (the corporate descendant of the Northern Pacific and Great Northern Railways) uses the railroad. The PH No. 10 Road intersection west of Castle Rock was the busiest segment of the Castle Rock to  Vader route of SR 411 in 1970, with an estimated daily average of 2,350 motorists. The intersection was also the busiest segment in 1991, with an estimated daily average of 4,150 motorists. Spur route. SR 411 has a spur route in Kelso, identified by the Washington State Department of Transportation (WSDOT) as SR 411 SP Kelso (SR 411 Spur) that extends west from SR 411 as West Main Street and north as 5th Avenue to . The busiest segment of the street is the SR 411 intersection, with an estimated daily average of 15,000 motorists in 2007. In 1970, the SR  4 intersection was the busiest, with an estimated daily average of 2,850 motorists. The highway was part of SR 411 from 1964 until 1991, when it was extended to .