Idaho State Highway 128
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| Route information | |
| Maintained by ITD | |
| Length: | 2.198 mi (3.537 km) |
| Major junctions | |
| West end: |
 SR 128 at Washington state line |
| East end: |
 US 12 in Lewiston
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| Location | |
| Counties: | Nez Perce |
| Highway system | |
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| Location: | Lewiston, Idaho |
| Length: | 0.130 mi (0.209 km) |
State Highway 128 (SH-128) is a 2.198-mile-long (3.537 km) state highway in the U.S. state of Idaho, serving the city of Lewiston in Nez Perce County. The highway travels east along the Clearwater River within Lewiston from Washington State Route 128 (SR 128) to U.S. Route 12 (US-12).
SH-128 begins at the eastern terminus of SR 128 at the Washington–Idaho state line that separates the cities of Clarkston and Lewiston. The highway travels east along the Clearwater River as the Down River Road through an industrial park located in northern Lewiston. SH-128 intersects its spur route and turns northeast towards its eastern terminus, an intersection with US-12 eastbound.
Every year, the Idaho Transportation Department (ITD) conducts a series of surveys on its highways in the state to measure traffic volume. This is expressed in terms of average annual daily traffic (AADT), which is a measure of traffic volume for any average day of the year. In 2011, ITD calculated that 4,702 vehicles per day used SH-128 between the Washington state line and US-12.
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