![]() ![]() OR 99 runs concurrent to I-5 through most of southern Oregon, splitting from the freeway to serve city centers and use other alternate routes, while OR 99W and OR 99E serve corridors on opposite sides of the Willamette River. 1, a name shared with Oregon Route 99 (OR 99) and its split routes north of Junction City. ![]() It is officially designated under Oregon's named route system as the Pacific Highway No. As a component of the Interstate Highway System, I-5 is also designated as an important highway under the National Highway System. The highway connects several of the state's largest metropolitan areas, which lie in the Rogue and Willamette valleys, and passes through counties with approximately 81 percent of Oregon's population. Interstate 5 is the second-longest freeway in Oregon, at 308 miles (496 km), and is the only Interstate to traverse the state from north to south. Two additional auxiliary routes were planned in the early years of the Interstate system, but were shelved after local opposition. The freeway also has three signed auxiliary routes that function as spurs and bypasses of major cities: I-105 in Eugene, I-205 in eastern Portland, I-405 in downtown Portland. Under Oregon's named route system, all of I-5 is designated as Pacific Highway No. The freeway remains parallel or concurrent to Oregon Route 99 (OR 99) and its spur routes, running along former segments of US 99 that were bypassed by I-5, from Ashland to Portland. The last segment of I-5, on the Marquam Bridge in Portland, was opened in October 1966 and the whole highway was dedicated later that month. The freeway incorporated early bypasses and expressways built for US 99 in the 1950s, including a new freeway route from Portland to Salem, and additional bypasses were built using federal funds. Route 99 (US 99) for most of its length, itself preceded by the Pacific Highway and various wagon roads. I-5 was designated in 1957 and replaced U.S. The highway runs 308 miles (496 km) from the California state line near Ashland to the Washington state line in northern Portland, forming the central part of Interstate 5's route between Mexico and Canada. It travels to the west of the Cascade Mountains, connecting Portland to Salem, Eugene, Medford, and other major cities in the Willamette Valley and across the northern Siskiyou Mountains. state of Oregon is a major Interstate Highway that traverses the state from north to south. Jackson, Josephine, Douglas, Lane, Linn, Marion, Clackamas, Washington, Multnomah ![]()
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