Idaho State Highway 55 partially coincident with U.S. Route 30 in Idaho
Route description
In the southwest corner of Idaho, State Highway 55 starts at the junction with US-95, approximately two miles (3 km) west of Marsing. The highway heads eastward as it travels through Marsing, crosses the Snake River and the Snake River Valley AVA. The highway continues east to Nampa (mostly as Karcher Road), where it meets Interstate 84 and US-30.
The highway is cosigned with those routes as it heads eastward to Meridian. SH-55 turns northward at Eagle Road and crosses the Boise River near Eagle. The junction with SH-44 is in Eagle, where the routes are briefly cosigned.
East of Eagle, SH-55 turns northward and climbs to the Spring Valley and over the Spring Valley Summit, at 4,242 feet (1,293 m) above sea level, then descends 1,600 vertical feet (490 m) on Horseshoe Bend Hill into Horseshoe Bend. The new multi-lane grade was completed in late 1991; the old curvier road is to the west, long plagued by landslides and closures. North of Horseshoe Bend, the highway ascends the Payette River and passes through several recreational areas, which offer rafting, fishing, and camping activities. SH-55 continues north, through the small communities of Banks and Smiths Ferry, then crosses the river via the Rainbow Bridge (built in 1933), originally known as the North Fork Bridge.
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