Idaho State Highway 128

State Highway 128 (SH-128) is a 2.2-mile-long (3.5 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). It was created in 1989 after improvements were made to an existing county road.

State Highway 128 marker
State Highway 128
Map
A map of northern Lewiston with SH-128 highlighted in red
Route information
Maintained by ITD
Length2.198 mi[1] (3.537 km)
Existed1989–present
Major junctions
West end SR 128 at Washington state line
East end US 12 in Lewiston
Location
CountryUnited States
StateIdaho
CountiesNez Perce
Highway system
  • Idaho State Highway System
SH-87 SH-162

Route description

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SH-128 begins at the eastern terminus of SR 128 at the WashingtonIdaho 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.[1][2]

To the north of the highway is Lewiston Hill. The Old Spiral Highway has its southern terminus at an intersection with SH-128.

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.[3]

History

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SH-128 was designated by the Idaho Transportation Board on August 18, 1989, after requests from local port officials to improve an existing county road named Down River Road.[4] The number was chosen to match an existing highway in Washington, which was extended to the state border in 1990 by the Washington State Legislature.[5][6]

Major intersections

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The entire route is in Lewiston, Nez Perce County.

mi[1]kmDestinationsNotes
0.0000.000 
 
SR 128 west – Clarkston
Western terminus, Washington state line
2.0933.368 
 
 
 
 
 
SH-128 Spur south to US 12 west – Lewiston
2.1983.537 
 
 
 
US 12 east to US 95 – Boise, Moscow
Eastern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Spur route

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State Highway 128 Spur
LocationLewiston, Idaho
Length0.130 mi[1] (209 m)

SH-128 has a short, 0.130-mile-long (0.209 km) spur route near its eastern terminus at US 12 in Lewiston.[1] The spur route travels southeast from SH-128 to US 12 westbound and serves as an extension of the intersection of the two highways to the north.[7]

References

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KML is from Wikidata
  1. ^ a b c d e "Milepost Log: State Highway 128". Idaho Transportation Department. August 30, 2011. Archived from the original on June 6, 2012. Retrieved February 22, 2013.
  2. ^ "State Highway 128" (Map). Google Maps. Retrieved February 22, 2013.
  3. ^ "Highway Data Quest". Idaho Transportation Department. November 8, 2011. Archived from the original on September 19, 2012. Retrieved February 22, 2013.
  4. ^ "Regular Meeting and Tour of District 1 by the Idaho Transportation Board" (PDF). Idaho Transportation Board. August 18, 1989. p. 148. Retrieved October 10, 2021.
  5. ^ "Chapter 108: State Route 128—Rerouting Of" (PDF). Session Laws of Washington, 1990. Washington State Legislature. March 19, 1990. p. 764. Retrieved October 10, 2021.
  6. ^ "Legislative Report of the Fifty-first Washington State Legislature, 1990 Regular and First Special Sessions" (PDF). Washington State Legislature. p. 81. Retrieved October 10, 2021.
  7. ^ "State Highway 128 Spur" (Map). Google Maps. Retrieved February 22, 2013.