 U.S. Highway 30 | ||||
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 US 30 highlighted in red | ||||
| Route information | ||||
| Maintained by ITD | ||||
| Length | 455.481 mi[1] (733.026 km) | |||
| Existed | 1926–present | |||
| Tourist routes |  Thousand Springs Scenic Byway | |||
| Major junctions | ||||
| West end |  US 30 in Fruitland | |||
| East end | US 30 near Dingle | |||
| Location | ||||
| Country | United States | |||
| State | Idaho | |||
| Counties | Payette, Canyon, Ada, Elmore, Gooding, Twin Falls, Cassia, Minidoka, Power, Bannock, Caribou, Bear Lake | |||
| Highway system | ||||
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U.S. Route 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. US 30 runs through the large population centers of Boise, Twin Falls, and Pocatello, as well as a plethora of smaller communities from Fruitland to Montpelier. 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. Outside of its Interstate concurrencies, the route is largely two-lane and rural outside of portions through major towns and cities.