SR 411 (trunk)
When the current state highway numbering system was first posted in January 1964, SR 411 began in Kelso and headed north along the west side of the Cowlitz River past the west side of the Castle Rock area and continued along the river and Olequah Creek to Jct SR 506 just east of Vader, where SR 411 ended. Effective April 1, 1992, both the northern and southern termini of SR 411 were changed. On the south end, SR 411 was extended to Jct SR 432 in Longview. On the north end the route from west Castle Rock to Vader was dropped from the state highway system. The road from west Castle Rock via downtown to I-5 Exit 49 north of town was added to the state highway system. SR 411 from downtown to I-5 follows the route of Old US 99. Today, SR 411 is 13.48 miles long
Before 1964, SR 411 had been SSH 12H.
SR 411 Spur
SR 411 does not connect directly with SR 4 in Kelso. The high level SR 4 bridge across the Cowlitz River crosses over SR 411. Before SR 411 was extended south to Jct SR 432, SR 411 crossed under SR 4 then looped around via city streets to meet SR 4. These last few blocks of what used to be SR 411 now make up SR 411 Spur. Spur SR 411 is 0.26 miles long.
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