The former route of U.S. Route 99 in Oregon mostly follows routes currently signed as Oregon Route 99, 99E, and 99W. The primary exception is from the California-Oregon state border north to Ashland, Oregon, where U.S. 99 is currently named Old Highway 99 S from the state border to exit 6 of Interstate 5. The former route is coterminous with Interstate 5 from exit 6 to the junction of Oregon Route 99 in Ashland.
Unlike California and Oregon, much of the former route of U.S. Highway 99 in Washington exists as local roads and regular city streets; only the route from Fife, Washington to Everett, Washington still retains the official "99" moniker (as State Route 99). The following is a simplified list of Washington counties and cities that portions of the old route traverse, along with their local names.
Former U.S. Highway 99 Route in Washington (North to South)
Road or Street Names
12th Street, D Street, Peace Portal Drive, Blaine Road
Bay Road, Vista Drive, 2nd Avenue, Main Street, Pacific Hwy.
Pacific Hwy., W. Bakerview Road, Northwest Drive, Northwest Avenue, Elm Street, DuPont Avenue, Prospect Street, E. Holly Street, Ellis St., Maple St., Samish Way, Lake Samish Drive, Old Highway 99 North Rd.
Old Highway 99 North Rd., S. Burlington Blvd.
Riverside Drive, N 4th St., S 3rd St., S 2nd St., Old Highway 99 S. Road
Conway Frontage Road, Pioneer Highway
Old 99 N, Pioneer Highway E. (2.4 miles north of Stanwood, an older re-alignment exists following: Old Pacific Highway, 102nd Ave NW, 268th St. to Pioneer Highway)
By 1968, US 99 was completely decommissioned with the completion of I-5 in Washington and California, but the highway's phasing out actually began July 1, 1964 thanks to the passage of Collier Senate Bill No. 64 on September 20, 1963. The bill launched a major program designed to greatly simplify California's increasingly complicated highway numbering system and eliminate concurrent postings like the aforementioned 60/70/99. The highways that replaced it are:
Oregon: Most of former US 99 in Oregon now signed as Oregon Route 99 (OR 99). The route still provides surface-level access to many southern Oregon towns served by I-5. It also provides access to many towns in the Willamette Valley. Between Junction City and Portland, the highway splits into eastern and western routes known as OR 99E and OR 99W, respectively. For significant stretches, OR 99 shares an alignment with I-5. Officially, the highway is signed with both route numbers when this occurs; however, in practice, this is often not the case as the OR 99 designation is dropped in favor of I-5. One notable exception is a stretch of OR 99E that runs between Albany and Salem, where OR 99E is cosigned along the highway.
US 99W in Oregon ran from Junction City, where in diverged from highway 99E, to Portland. The US designation was redesignated as Oregon Route 99W in 1972. In 1994, Oregon 99W was truncated to Interstate 5 in Tigard at Exit 294. As such, highways 99W and 99E no longer converge.
US 99E in Oregon ran from Junction City, where it diverged from highway 99W, to Portland, but using a different route than highway 99W. A segment between Albany and Salem is cosigned with Interstate 5. Like its western counterpart, US 99E was changed to state highway 99E in 1972. Its current northern terminus is at Interstate 5 in Delta Park near the Portland Expo Center at Exit 307.