The highway is the busiest in Oregon, with a daily average of over 177,000 vehicles in eastern Portland while the least-traveled section of I-84, south of Baker City, only carries 9,400 vehicles. I-84 is maintained by the Oregon Department of Transportation (ODOT), who conduct an annual survey of traffic volume that is expressed in terms of average annual daily traffic (AADT), a measure of traffic volume for any average day of the year. 2 and all of the Old Oregon Trail Highway No. It is officially named the Vietnam Veterans Memorial Highway and is mostly concurrent with US 30, which also carries part of the Columbia River Highway No. As a component of the Interstate Highway System, I-84 is also designated as an important national highway under the National Highway System. The highway connects the Portland metropolitan area to the Columbia River Gorge, the northeastern Columbia Plateau, and part of the Snake River Valley. Interstate 84 is the longest freeway in Oregon, at over 375 miles (604 km) in length, and is the only Interstate to traverse the state from west to east. The final section of I-84, near Baker City, was opened to traffic on July 3, 1975. New roads were built through the Columbia River Gorge in the 1960s and across northeastern Oregon in the 1970s. The earliest sections of the freeway incorporated the existing Banfield Freeway between Portland and Troutdale, opened in 1955, and upgraded other parts of US 30 to Interstate standards. I-84 was established in 1957 and originally carried the designation of Interstate 80N (I-80N) until 1980, when this was changed to I-84 to prevent confusion with the southerly I-80. I-84 crosses the Snake River at Ontario, continuing southeast towards Boise, Idaho. Near Pendleton, it leaves the Columbia River and runs southeasterly across the Blue Mountains via La Grande and Baker City. It passes through the cities of Hood River and The Dalles within the gorge and also serves several state parks and natural monuments. The freeway serves as the main east–west route through Portland and Gresham and continues into the Columbia River Gorge National Scenic Area. I-84 intersects several of the state's main north–south roads, including US 97, US 197, I-82, and US 395. 6 the entire length is also designated as the Vietnam Veterans Memorial Highway. The highway roughly follows the Columbia River and historic Oregon Trail in northeastern Oregon, and is designated as part of Columbia River Highway No. Route 30 (US 30) for most of its length and runs 376 miles (605 km) from an interchange with I-5 in Portland to the Idaho state line near Ontario. state of Oregon is a major Interstate Highway that traverses the state from west to east. Multnomah, Hood River, Wasco, Sherman, Gilliam, Morrow, Umatilla, Union, Baker, Malheur
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