Interstate 205 (Oregon–Washington)

Washington and Clackamas counties

I-205 begins at a semi-directional T interchange with I-5 in eastern Tualatin, a suburb in Washington County, Oregon. The four-lane freeway travels east along Saum Creek and the Tualatin River into Clackamas County, where it passes a mix of exurban neighborhoods, forests, and farmland. After crossing the river, I-205 turns southeasterly into West Linn and runs along the banks of the Willamette River near Willamette Falls; the freeway has a scenic overlook of the falls for northbound traffic. After an interchange with Oregon Route 43 (OR 43), I-205 expands to six lanes and crosses the Willamette River on the Abernethy Bridge, which runs for 2,727 feet (831 m) into Oregon City and is capped to the east by an interchange with OR 99E. The freeway passes Oregon City's Amtrak train station, and then follows the railroad north to a junction with OR 213, which becomes concurrent with I-205.

The freeway continues north across the Clackamas River, passing through residential and industrial areas in Gladstone and Clackamas. Near Johnson City, I-205 intersects the west end of OR 212, which provides access to Boring and Mount Hood. The concurrency with OR 213 ends at a partial cloverleaf interchange with OR 224—the Sunrise Expressway—near several radio towers on the west side of Mount Talbert. I-205 briefly expands to eight lanes and intersects several roads near the Kaiser Sunnyside Medical Center and Clackamas Town Center, a regional shopping mall, then continues north through an unincorporated area between Milwaukie and Happy Valley. The freeway travels north with tracks on the west side for the MAX Green Line, a light rail service operated by TriMet, and enters Portland in Multnomah County.

Portland and Vancouver

I-205 passes through eastern Portland about 5 miles (8.0 km) from downtown, and runs parallel to OR 213 on 82nd Avenue and the I-205 Transitway that carries the MAX Green Line. From the Clackamas Town Center, the freeway travels through residential areas in the Lents neighborhood at the foot of Mount Scott, home to the Willamette National Cemetery. I-205 intersects U.S. Route 26 (US 26) at Powell Boulevard near Kelly Butte and the Jade District in Powellhurst-Gilbert. North of Division Street, the freeway marks the boundary between the neighborhoods of Montavilla and Hazelwood, and the MAX Green Line switches to the east side. I-205 then intersects Stark, Burnside, and Gilsan streets via a series of weaved ramps near Mall 205 and the Adventist Health Portland hospital.

North of Gilsan Street, the freeway intersects I-84 and US 30 near the Gateway/Northeast 99th Avenue Transit Center, where the MAX Green Line turns west. I-205 and I-84/US 30 travel parallel to each other for one mile (1.6 km) along the base of Rocky Butte, where they follow a section of the MAX Red Line on the I-205 Transitway. I-84/US 30 turns east towards the Columbia River Gorge at Northeast Fremont Street, while I-205 continues north around the suburban enclave of Maywood Park with the light rail trackway in its median. The freeway intersects US 30 Bypass (Lombard Street and Sandy Boulevard) and turns northeast to pass under a railroad in Parkrose. The MAX Red Line diverges west from the freeway towards Portland International Airport, which is accessed from I-205 via the Airport Way interchange on the south side of the Columbia River. I-205 crosses the Columbia River and Government Island on the eight-lane Glenn L. Jackson Memorial Bridge, a concrete segmental bridge that spans 11,750 feet (3,580 m) between Oregon and Washington.

On the Washington side of the river, I-205 serves the northeastern side of Vancouver and the surrounding unincorporated areas of Clark County. The freeway intersects State Route 14 (SR 14), a regional east–west freeway that connects to Downtown Vancouver and the Camas–Washougal area in a partial combination interchange on the north side of the river. I-205 curves northwest to intersect Mill Plain Boulevard in a partial cloverleaf interchange and Northeast 18th Street in a half-diamond interchange before it continues north through predominantly residential neighborhoods. The six-lane freeway then reaches a cloverleaf interchange with another east–west freeway, SR 500, on the east side of the Vancouver Mall. I-205 narrows to four lanes and travels northwest along LaLonde Creek to the community of Salmon Creek, where it terminates at an interchange with I-5. The incomplete interchange is located southwest of Washington State University Vancouver and requires some movements from I-5 to and from Vancouver to be made via two half-diamond interchanges on Northeast 134th Street.

Multi-use trail

A multi-use bicycle and pedestrian trail follows I-205 for much of its distance on the Oregon side of the Portland metropolitan area, and connects to the Springwater Corridor trail near the Foster Road exit. The paved trail parallels the highway and the I-205 Transitway for 19 miles (31 km) from Oregon City to Southeast 23rd Street in Vancouver. The 12-foot-wide (3.7 m) trail is situated in the middle of the Glenn L. Jackson Memorial Bridge between lanes of traffic with 4.5-foot (1.4 m) barriers but has no access to Government Island. The bridge was designed to support light rail trains in the median, which would replace the trail, but the route was not considered by transit authorities. ODOT maintains the I-205 Trail, but some trash-pickup and site-cleanup responsibilities were transferred to the Portland city government in 2018.

Planning and routing debate

In 1943, New York-based planner Robert Moses authored the Portland Improvement Plan, which included a "scenic thoroughfare" that would bypass Portland to the east and an inner loop of major roads in the downtown area. An earlier comprehensive plan from 1912 had envisioned a series of arterial highways along the future corridor, which would lead to a bridge over the Columbia River via Government Island. The corridor was among four Portland-area routes included in a 1955 plan from the federal Bureau of Public Roads (BPR) for what became the Interstate Highway System, which was approved one year later. The Oregon State Highway Commission designated it as the Laurelhurst Freeway, running along Northeast 39th Avenue—now César E. Chávez Boulevard—through the Laurelhurst neighborhood between Tualatin and crossing the Columbia River via a toll-free bridge. The bridge's proposed location was later shifted west to Northeast 30th Avenue to accommodate a runway extension at Portland International Airport.

The American Association of State Highway Officials approved I-205 as the designation for the Portland–Vancouver bypass freeway in November 1958. In 1961 it was added to Washington's state highway system as a branch of Primary State Highway 1, and it was renumbered to State Route 205 in 1964. To connect with its parent route I-5 at Tualatin, the Laurelhurst Freeway would turn west to cross the Willamette River at Lake Oswego and travel along the south side of the lake. It was planned to be the last major freeway in the Portland area to be completed under the 1955 plan; construction was projected to be finished by 1974 at a cost of $70 million (equivalent to $561 million in 2024 dollars). A corresponding western bypass of Portland was omitted from plans due to the topography of the Tualatin Mountains and a low population, but was unsuccessfully proposed in the 1960s as the Rivergate Freeway.

The first set of alternatives for the Laurelhurst Freeway, which was renamed the Central East Side Freeway and later referred to as I-205, were presented to the public in 1961 and 1962 ahead of a formal routing study. In December 1961, the Oregon State Highway Department presented five alternatives for the east–west section through Lake Oswego that drew opposition from community members and the local school district, which feared it would isolate the schools from homes. The Laurelhurst Community Council also organized opposition to the freeway plans at public hearings the following month; local residents feared disruption of the neighborhood's character, and an influx of low-income and multi-family development. In April 1963, responding to a petition drive from residents, the Lake Oswego City Council unanimously passed a resolution opposing any routing of I-205 in the city and a bridge over the Willamette River that would induce freeway construction.