Washington State Route 128

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State Route 128

A map of Washington's highway system in the
Clarkston area with SR 128 highlighted in red.
Route information
Auxiliary route of US 12
Defined by RCW 47.17.255
Maintained by WSDOT
Length2.30 mi[1] (3.70 km)
Major junctions
West end US 12 in Clarkston
Major intersections SR 193 near Clarkston
East end SH-128 at Idaho state line near Clarkston
CountryUnited States
Highway system
SR 127 SR 129

State Route 128 (SR 128) is a Washington state highway located in Asotin and Whitman counties, west of the Idaho state line. The 2.30-mile (3.70 km) long route runs north from U.S. Route 12 (US 12) in Clarkston to cross the Snake River and turn east after intersecting SR 193 to terminate at State Highway 128 (SH 128) on the Idaho state line. The highway was originally created in 1964 on a Pomeroy–Clarkston route, replacing Secondary State Highway 3K (SSH 3K), which had been established in 1937; in 1991, the route was changed to its present form.

Route description

State Route 128 (SR 128) begins at an intersection with U.S. Route 12 (US 12) in Clarkston, a city in Asotin County. The road then crosses the Snake River over the Red Wolf Crossing into Whitman County, where it crosses the Starbuck, WASpalding, ID route of the Great Northwest Railroad and intersects the eastern terminus of SR 193.[3][4] At the SR 193 intersection, the highway turns east and continues to the Idaho state line, where it becomes Idaho State Highway 128 (SH-128);[5] which continues for another 2.198 miles (3.537 km) before ending at US-12 north of Lewiston, Idaho.[6][7] SR 128 after the US 12 intersection was used by 5,000 motorists daily in 2007 based on average annual daily traffic (AADT) data collected by the Washington State Department of Transportation.[8]


The shield of Secondary State Highway 3K (SSH 3K) from 1937–1964

The first highway that would later become SR 128 was Secondary State Highway 3K (SSH 3K), which was first designated in 1937.[9] The road ran from Pomeroy in Garfield County southeast to Peola and later northeast to Clarkston, terminating at Primary State Highway 3 (PSH 3), co-signed with U.S. Route 410 (US 410) at both termini.[9][10] During the 1964 highway renumbering, SSH 3K became SR 128, which ran 42.19 miles (67.90 km);[11][12] the current route of the highway was occupied by SR 193, which was Secondary State Highway 3G from 1969 to 1970.

In 1990, the state legislature approved an extension of SR 128 across the Red Wolf Crossing (replacing a section of SR 193) and east to the Idaho state line. The extension was in response to the state of Idaho designating Idaho State Highway 128 on the other side of the border.[13][14] A year later, SR 128 was truncated from Pomeroy to Clarkston along its current route,[15] a loss of 42.19 miles (67.90 km) in total.[12] The transfer was estimated to cost the county government $250,000 for maintenance, due in part to 1 mile (1.6 km) of new pavement required near Peola.[16]

Major intersections

AsotinClarkston0.000.00 US 12 – Walla Walla, Pullman, Yakima
Snake River0.390.63Red Wolf Crossing
Whitman0.510.82 SR 193 (Wawawai River Road)
2.303.70 SH-128 at the Washington – Idaho state line
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b Strategic Planning and Programming Division (March 5, 2007). State Highway Log Planning Report 2006, SR 2 to SR 971 (PDF) (Report). Washington State Department of Transportation. Retrieved June 4, 2009.
  2. ^ Washington State Legislature. "RCW 47.17.255: State route No. 128". Retrieved June 4, 2009.
  3. ^ Washington State Rail System (PDF) (Map). Cartography by United States Geological Survey. Washington State Department of Transportation. September 2008. Retrieved June 4, 2009.
  4. ^ Great Northwest Railroad (Map). Watco Companies. Retrieved June 4, 2009.
  5. ^ Google (June 4, 2009). "State Route 128" (Map). Google Maps. Google. Retrieved June 4, 2009.
  6. ^ Idaho Transportation Department (December 18, 2006). "State Highway 128". Retrieved June 4, 2009.
  7. ^ Google (June 4, 2009). "Idaho State Highway 128" (Map). Google Maps. Google. Retrieved June 4, 2009.
  8. ^ Washington State Department of Transportation (2007). "2007 Annual Traffic Report" (PDF). Retrieved June 4, 2009.
  9. ^ a b Washington State Legislature (March 18, 1937). "Chapter 207: Classification of Public Highways". Session Laws of the State of Washington. Session Laws of the State of Washington (1937 ed.). Olympia, Washington: Washington State Legislature. p. 1001. Retrieved June 4, 2009. (j) Secondary State Highway No. 3K; beginning at Pomeroy on Primary State Highway No. 3, thence in a southeasterly direction by the most feasible route to Peola, thence in a northeasterly direction by the most feasible route to a junction with Primary State Highway No. 3 in the vicinity west of Clarkston.
  10. ^ Bureau of Public Roads & American Association of State Highway Officials (November 11, 1926). United States System of Highways Adopted for Uniform Marking by the American Association of State Highway Officials (Map). 1:7,000,000. Washington, DC: United States Geological Survey. OCLC 32889555. Retrieved November 7, 2013 – via Wikimedia Commons.
  11. ^ C. G. Prahl (December 1, 1965). "Identification of State Highways" (PDF). Washington State Highway Commission, Department of Highways. Retrieved June 4, 2009.
  12. ^ a b Washington State Highway Commission, Department of Highways (1970). "Annual Traffic Report, 1970" (PDF). Washington State Department of Transportation. pp. 132–133. Retrieved June 4, 2009.
  13. ^ "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.
  14. ^ "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.
  15. ^ Washington House of Representatives (1991). "Chapter 342, Laws of 1991: State Highway Routes - Revisions To (House Bill 5801)". Washington State Legislature. Retrieved June 4, 2009. Sec. 13. RCW 47.17.255 and 1990 c 108 s 1 are each amended to read as follows: A state highway to be known as state route number 128 is established as follows: Beginning at a junction with state route number 12 ((at Pomeroy, thence southeasterly to Peola)) in Clarkston, thence northeasterly and easterly by way of the Red Wolf crossing to the Idaho state line.
  16. ^ "Route 128 could be costly for county". Lewiston Morning Tribune. April 26, 1990. Retrieved September 13, 2021 – via NewsBank.

External links