Oregon Route 99W

The Pacific Highway West begins at the interchange with I-5 (Pacific Highway) and OR 126 Business (McKenzie Highway No. 15) in eastern Eugene. It heads west through downtown Eugene along OR 99 and OR 126 Business, and then northwest and north to Junction City on OR 99.

At Junction City, OR 99 ends and OR 99W begins along the Pacific Highway West, while OR 99E heads northeast on the Albany-Junction City Highway No. 58. While OR 99E quickly crosses the Willamette River, OR 99W stays on its west side through the Willamette Valley, passing through towns such as Monroe, Corvallis, Monmouth, Rickreall, Amity, McMinnville and Lafayette. Oregon Route 18 provides a bypass for OR 99W around downtown McMinnville and Lafayette.

At McMinnville, OR 99W turns northeast. It passes through the winemaking towns of Dundee and Newberg before entering the Portland suburb of Sherwood. OR 18 provides a partial bypass for OR 99W around downtown Dundee and Newberg. The bypass currently ends at OR 219, but is proposed to extend northeast to OR 99W northeast of Newberg. OR 99W then skirts the city of Tualatin and passes through Tigard before entering Portland and immediately ending at I-5.

The Pacific Highway West, however, continues northeast and north, paralleling I-5 on Barbur Boulevard. OR 10 joins at Capitol Highway, which is not a state highway. South of the Ross Island Bridge approach, Oregon Highway 99W and OR 10 split from Barbur Boulevard onto Naito Parkway, an arterial that once connected directly to Harbor Drive. OR 10 ends at the west end of the Ross Island Bridge, which carries US 26, the Mt. Hood Highway No. 26. Until around 2005, US 26 came off the bridge onto the Pacific Highway West north into downtown Portland, but it now heads west on the locally maintained Arthur Street to reach I-405.

At the overpass over I-405 is the former split with Harbor Drive, which was replaced by Tom McCall Waterfront Park in 1974. The road now runs into Naito Parkway (formerly Front Avenue), and is state-maintained until Market Street, the eastbound half of the one-way pair of the Sunset Highway (US 26 left the Pacific Highway West here prior to ca. 2005).

Oregon Route 99W as North Interstate Avenue in Portland

The Pacific Highway West continues north through downtown, locally maintained along Naito Parkway, to the state-maintained Steel Bridge. There is a direct ramp for northbound traffic onto the bridge, but the former southbound ramp is now used by the MAX Light Rail system, and so southbound traffic must head west to 3rd Avenue, three blocks west of Naito Parkway.

At the northeast end of the Steel Bridge, the Pacific Highway West again becomes locally maintained, and heads north on Interstate Avenue all the way to I-5 (the Pacific Highway) near the Interstate Bridge. It is again state-maintained north of Argyle Street.

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.) The section north of Portland was initially named Multnomah Boulevard until Interstate Avenue was adopted in 1916; the street was paved in the late 1920s amid several minor realignments to provide for a 100-foot (30 m) wide highway.[4]

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.[5] 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 December 1971, 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, with various signs identifying it as 99W placed sporadically between downtown and Tigard.

Note: mileposts do not reflect actual mileage due to realignments.

County	Location	mi[7]	km	Destinations	Notes
Lane	Junction City	108.76	175.03	OR 99E north / OR 99 south – Harrisburg, Albany, Junction City, Eugene
Benton	Monroe	101.15	162.79	Territorial Highway (OR 200) – Cheshire, Florence
	Corvallis	84.15	135.43	OR 34 east to I-5 – Albany, Lebanon	Interchange; northbound exit and southbound entrance
		84.15	135.43	US 20 west / OR 34 west – Philomath, Oregon Coast	Interchange; southern end of US 20 overlap
		83.42	134.25	US 20 east / OR 34 east to I-5 – Albany, Lebanon	Northern end of US 20 overlap
Polk	Monmouth	63.42	102.06	OR 51 (OR 194) – Kings Valley, Monmouth City Center, Independence
	Rickreall	57.81	93.04	Rickreall Road (OR 223) – Dallas, Derry
	​	57.43	92.42	OR 22 – Oregon Coast, Salem	Interchange
Yamhill	Amity	44.75	72.02	Nursery Street (OR 153) – Hopewell, Salem
		44.68	71.91	5th Street (OR 153) – Bellevue, Sheridan, Willamina	Northern end of OR 153 overlap
	​	43.50	70.01	OR 233 – Dayton
	​	39.24	63.15	OR 18 east – Dayton, Portland	Interchange
	McMinnville	38.99	62.75	OR 18 west – Sheridan, Oregon Coast
		37.70	60.67	3rd Street
	​	34.85	56.09	OR 47 north – Carlton, Forest Grove
	Lafayette	32.29	51.97	Madison Street to Lafayette Highway – Hopewell
	Dayton Junction	29.73	47.85	OR 18 / OR 233 – Dayton, Salem, Oregon Coast
	Newberg	23.71	38.16	OR 240 west – Chehalem Valley, Yamhill
		23.41	37.67	OR 219 north – Scholls, Hillsboro	Southern end of OR 219 overlap
		22.89	36.84	OR 219 south – Champoeg State Park, St. Paul, Salem, Woodburn	Northern end of OR 219 overlap
Washington	Tigard	8.82	14.19	Hall Boulevard (OR 141) – Metzger, Durham
		8.66	13.94	OR 217 / Sunset Highway (US 26) – Beaverton, Salem	Interchange
Multnomah	Portland	7.44	11.97	I-5 – Portland, Salem	Interchange
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Incomplete access

• Oregon Highways - Pacific Highway West #1W