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U.S. Highway 30 (US 30) runs northwest–southeast across the southern half of lower Idaho for 455.481 miles (733.026 km). US 30 enters the state from Oregon across the Snake River in Fruitland and exits into Wyoming east of Dingle .
The TransAmerica Trail or TAT is a 4,253-mile (6,845 km) transcontinental vehicular route, intended as a recreational pathway across the United States using a minimum of paved roads, traveled by dual-sport motorcycles, off-road vehicle, or touring bicycle.
From there Interstate 86 to Pocatello roughly approximates the trail. Highway 30 roughly follows the path of the Oregon Trail from there to Montpelier, Idaho. Starting in about 1848 the South Alternate of Oregon Trail (also called the Snake River Cutoff) was developed as a spur off the main trail.
Prior to the construction of I-84, the corridor was served by Idaho State Highway 2 and Route A of the Sampson Trails system. [2] [16] U.S. Route 30 was created in 1926 under the national numbered highway system, traveling through southern Idaho along the historic Oregon Trail.
During the 1920s, in lieu of numbering its highways, Idaho had a system of lettered Sampson Trails. [2] They were marked by businessman Charles B. Sampson of Boise at no expense to the state, using orange-colored shields. [3] By 1929, the trails system had included 6,500 miles (10,500 km) of marked highways that covered most of the state. [4]
The highway exits Idaho at Lost Trail Pass at 7,014 feet (2,138 m) and enters Montana toward the Bitterroot Valley. West of the highway at the pass is the Lost Trail Powder Mountain ski area, with terrain in both states.
Idaho State Highway n (SH-n) System links; ... US 93 at Lost Trail Pass: 1926: current US 95: 538.562: 866.732 US 95 near Homedale: BC 95 near Eastport
I-90 is the only Interstate in northern Idaho and a major east–west route, forming part of a transcontinental highway. [15] [16] At 74 miles (119 km), it is the second-shortest mainline Interstate in the state, after Interstate 86, and the third-longest. [17] The entire highway was designated as the Purple Heart Trail by the state legislature ...