As posted in 1964, SR 14 extended from I-5 Exit 68 via White Pass to Jct US 410 near Naches. When US 12 was extended from Lewiston, Idaho to Aberdeen, Washington in 1967, the SR 14 designation was moved to the Maryhill to Kennewick highway, signed from 1964 to 1967 as SR 12. 140 series SRs branching from the White Pass Highway were renumbered as 120 series routes. 120 series routes branching from SR 14 and US 830 became 140 series. In 1968, when US 830 was decommissioned as a US route, SR 14 was extended west from Maryhill to Jct I-5 in Vancouver. I-82 from Exit 113 to the Columbia River was opened to traffic in 1985. In late 1986, US 395 from the Umatilla, Oregon area to I-182 Exit 14 was rerouted from its long tome route via Wallula Jct to the I-82 corridor . SR 14 was shortened to its present terminus at I-82 Exit 131 near Plymouth. SR 14 is now 180.68 miles long.
Before 1964, the highway from I-5/US 99 via White Pass to Jct US 410 near Naches was the White Pass branch of PSH 5.
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