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The Oregon state government initially proposed numbering the auxiliary Interstates using lettered suffixes, but were denied in 1958 by the American Association of State Highway Officials (forerunner to the AASHTO). [7] The last section of the Interstate Highway system to be built in Oregon, on I-82 near Hermiston, opened on September 20, 1988. [8]
1940s-style sign for Oregon Route 50, incorporating the Seal of Oregon. The primary, two-digit route numbers were laid out in a grid system, similar to the Interstate Highway System. Odd-numbered routes were north–south and increased in number bearing west, ranging from OR 3 in Wallowa County to OR 53 in Clatsop and Tillamook counties.
However, these routes are not required to meet the same standards as the mainland routes: Highways on the Interstate System in Alaska and Puerto Rico shall be designed in accordance with such geometric and construction standards as are adequate for current and probable future traffic demands and the needs of the locality of the highway. [4]
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. [2] The highway connects the Portland metropolitan area to the Columbia River Gorge, the northeastern Columbia Plateau, and part of the Snake River Valley. [3]
Number Length (mi) Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes US 20: 451.25: 726.22 US 101 in Newport: US 20/US 26 towards Boise, ID
Aerial view of Interstate 5 in downtown Medford, where it travels on an elevated viaduct. I-5 enters Oregon at the California state line in southern Jackson County.The highway travels northeast along a ridge in the Siskiyou Mountains, with a maximum grade of 6 percent, to Siskiyou Summit; [12] at 4,310 feet (1,310 m), it is the highest point on all of I-5 and one of the highest points on the ...
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