Oregon Route 99W - History

History

The first highway in the corridor was the Capitol Highway (Highway 3), from Portland to Salem via Dayton (roughly present OR 99W and OR 221). In 1927 it was merged with the West Side Highway, which ran from Dayton to Junction City, to form the West Side Pacific Highway, still numbered 3, and a western loop of the Pacific Highway (Highway 1/U.S. Route 99). (The former Capitol Highway south of Dayton was removed from the system, but was later taken over as the Salem-Dayton Highway.)

In 1930, Highway 3 was assigned the U.S. Route 99W number, and Highway 1 (old US 99) between the ends of Highway 3 became US 99E. Highway 1 was similarly split in 1938, forming the Pacific Highway West - Highway 1W - and the Pacific Highway East, Highway 1E. Highway 1W was formed from Highway 3, and extended north on Interstate Avenue to just south of the Interstate Bridge.

In 1957, with the assignment of I-5, the Pacific Highway (Highway 1) was moved to its planned alignment, resulting in an extension of Highway 1W south to Eugene. US 99W however continued to terminate at Junction City; the new I-5 was designated US 99 when it opened in 1961. (US 99W from south of downtown Portland north to its end was temporarily part of US 99 from 1961 to 1963, when I-5 opened north of downtown.)

US 99 became OR 99 in 1972, resulting in the renumbering of US 99W to OR 99W. It was truncated in 1979 to I-5 just north of the Tigard/Portland line. It was again re-extended to south of downtown in 1996, but has since been re-truncated.