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U.S. Highway 20 (US 20) is the portion of an east–west United States Numbered Highway in the state of Idaho.It begins northwest of Parma at the Oregon state line and enters Montana 9.6 miles (15.4 km) away from the Yellowstone National Park west entrance.
Forest Service Road No. 247 near Headquarters: 1929: current SH-12 — — US-95 Business in Craigmont: SH-62 in Kamiah: 1929: 1962 Renumbered SH-64 because US-12 extended into Idaho SH-13: 26.390: 42.471 US-95 in Grangeville: US-12 near Kooskia: 1929: current SH-14: 49.515: 79.687 SH-13 near Harpster: Airport Road in Elk City: 1929
U.S. Route 20 (US 20) is a transcontinental east–west U.S. Highway that travels between Newport, Oregon, and Boston, Massachusetts.It passes through southern Montana for approximately 10 miles (16 km), connecting Targhee Pass at the Idaho state line to the town of West Yellowstone and the West Entrance of Yellowstone National Park near the Wyoming border.
Montana's secondary system was established in 1942, [4] but secondary highways (S routes) were not signed until the 1960s. [1] S route designations first appeared on the state highway map in 1960 [5] and are abbreviated as "S-nnn". Route numbers 201 and higher are, with very few exceptions, exclusively reserved for S routes.
The route has remained mostly unchanged from its original routing, except to expand lanes or straighten and widen some narrow sections. The most notable reroutings from the original corridor are: 1) the section from Moyie Springs, Idaho, to just inside the Montana border, which once ran much further north, as seen on the 1937 map of the area [3] (Old US 2N intersects today's US 2 about 2.6 ...
The freeway heads north out of Idaho Falls parallel to the Montana Subdivision rail line, Old Highway 91, and the Snake River. I-15 enters Jefferson County just north of its diamond interchange with Osgood Road, and the freeway diverges from the Snake River at Roberts, where it has a diamond interchange with the western end of SH 48. [2]
Between 1926 and 1977 a road between Shoshone, Idaho, and Challis, Idaho, was also labeled US 93 Alternate. This stretch of road is now designated as part of US 93. The pre-1977 routing of 93 between those points is now designated as Idaho State Highway 75.
The Thousand Springs Scenic Byway is a picturesque section of US 30 in southern Idaho between the towns of Bliss and Buhl, dipping down into the Hagerman Valley and a canyon of the Snake River. The highway has four extensive concurrencies with Interstate Highways: Interstate 84 (I-84) twice, I-86 , and I-15 .