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 from Oregon City to Southeast 23rd Street in Vancouver. The trail is situated in the middle of the Glenn L. Jackson Memorial Bridge between lanes of traffic with 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. History 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 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