Oregon Interstate 105
Interstate 105 or I -105 is an Interstate Highway in the US state of Oregon. The highway forms a short east-west connection in the city of Eugene and suburb Springfield. The road connects Interstate 5 to the urban area. The route is 10 kilometers long.
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I-105 is double-numbered with State Route 126, which is much longer, running from the coast to central Oregon. Eugene is Oregon’s third largest city with a population of 154,000. The highway begins at downtown Eugene, crossing the Willamette River. The road has 2×2 lanes, and 170 kilometers south of Portland it crosses Interstate 5, which runs from Sacramento in California to Portland. Then the road continues to Springfield, an eastern suburb.
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I-105 was built through the Eugene region at the same time as I-5, but the exact year of opening is unknown. Both 1961, 1969 and 1970 are mentioned. The interchange with I-5 was opened on October 25, 1967.
Every day, 60,000 to 63,000 vehicles drive west of I-5 and 70,000 vehicles east of the I-5 interchange. This drops to 33,000 vehicles on State Route 126.
Oregon Interstate 405
Interstate 405 or I -405 is an Interstate Highway in the US state of Oregon. The highway is a bypass of downtown Portland, the largest city in Oregon. The highway runs downtown, branches off, then rejoins Interstate 5. The route is 7 kilometers long.
The connecting arch from US 30 to I-405 with a view of the Fremont Bridge.
On the south side of downtown, Interstate 5 splits, with I-5 on the east bank of the Willamette River, and I-405 on the west bank, passing downtown. There are 2×3 lanes available, and the road is below ground level. Steep hills rise right next to the highway. On the west side of downtown, US 26 exits and leads to the western suburbs. The I-405 then has 2×2 lanes with weaving sections. Here too, the road is below ground level, with a viaduct of intersecting streets every 60 meters. The Fremont Bridge, a double-deck arch bridge, crosses the Willamette River in 2×4 lanes. Then I-405 rejoins Interstate 5 toward Seattle.
A highway along the west side of Downtown Portland was recommended in 1943 by famed road builder Robert Moses in his “Portland Improvement Report.” In 1955, plans were presented for two freeways, the Sunset Freeway and the Stadium Freeway, both of which were later combined into one bypass of Downtown Portland. At the end of 1964, the clearing of the route for buildings began. Purchasing the route cost $25 million, a huge sum for the time. construction of the sunken parts started in 1967. The construction was technically complex, with 55 retaining structures, 15 viaducts and 4 tunnels located 2 kilometers away. Most of I-405 opened on February 25, 1969, except for the bridge over the Willamette River, the Fremont Bridgewhich was built a little later and opened on November 15, 1973. Construction of I-405 had cost a total of $121 million and was the most expensive project in Oregon state history at the time.
Every day, 80,000 vehicles travel between I-5 and US 26 on the south side of downtown, 119,000 vehicles between US 26 and US 30 on the west side of downtown, and 128,000 vehicles between US 30 and I-5 on the north side of downtown.