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For example, in Wisconsin, much of the Yellowstone Trail was designated with State Highway 18 in 1919. State Highway 18 then became U.S. Route 10 through Wisconsin, with the creation of the United States Numbered Highway System in 1926. Changes like these made privately managed road trails like the Yellowstone Trail less relevant.
[29] [30] [31] The highway was signed as part of State Road 3 and incorporated into the Yellowstone Trail, a national auto trail, [32] and later the federal numbered highway system created in 1926. Under the federal system, the Ellensburg–Yakima section formed part of US 97, the main north–south route through central Washington and Oregon. [33]
Quartzville Road Back Country Byway: Oregon: 50 80 Quartzville Road and US 20 near Foster: Forest Road 11 and OR 22 south of Marion Forks: Route follows the wild and scenic Quartzville Creek through Willamette National Forest in the Oregon Cascades. Natural features include old growth forests, rocky outcroppings, and wildflower meadows, while ...
Spanning 3,365 miles (5,415 km), it is the longest road in the United States, [1] and, in the east, the route is roughly parallel to Interstate 90 (I-90), which is the longest Interstate Highway in the U.S. There is a discontinuity in the official designation of US 20 through Yellowstone National Park, with unnumbered roads used to traverse the ...
The Oregon Highway Commission requested that US 30 be assigned to the Columbia River Highway instead and have US 20 truncated at Pocatello, Idaho. The American Association of State Highway Officials ultimately agreed to truncate US 20 further to Yellowstone National Park, but later extended it via central Oregon in 1940. [2]
US 395 developed into a parallel of its parent route when it was extended south through Oregon in 1935. [24] [25] In Oregon, it replaced most of Oregon Route 11. [26] The Washington section followed the northernmost section of the Inland Empire Highway, a state road that was developed in the 1910s. [2]
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