U.S. Route 12 in Idaho
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| Lewis and Clark Highway, Northwest Passage Scenic Byway |
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| Route information | |
| Maintained by ITD | |
| Length: | 174.210 mi (280.364 km) |
| Existed: | 1962 – present |
| Tourist routes: |
 Northwest Passage Scenic Byway |
| Major junctions | |
| West end: | Washington state line in Lewiston |
 US-95 in Lewiston
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| East end: | Montana state line at Lolo Pass |
| Highway system | |
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US Route 12 (US 12) is a federal highway in north central Idaho. It extends 174.210 miles (280.364 km) from the Washington state line in Lewiston east to the Montana state line at Lolo Pass, generally along the route of the Lewis and Clark expedition, and is known as the Northwest Passage Scenic Byway It was previously known as the Lewis and Clark Highway.
US 12 enters Idaho at the Washington state line in Lewiston, Nez Perce County, crossing the Snake River at the state line. It heads east through Lewiston, turning north to cross the Clearwater River and intersect SH-128. It continues east to overlap US 95 along a limited access section. The overlapped highways run east along the north bank of the Clearwater for 7.3 miles (11.7 km), leaving Lewiston and entering the Nez Perce Indian Reservation before separating.
US 12 then continues east along the north bank of the Clearwater through North Lapwai, past the Ant and Yellowjacket rock formation and a historical marker for the Spalding Mission. It continues east to intersect SH-3 and cross the Clearwater again.
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