A map of Washington's highway system in the Clarkston area with SR 128 highlighted in red.
Route information
Auxiliary route of US 12
Maintained by WSDOT
Length
2.30 mi[1] (3.70 km)
Existed
1964[2]–present
Major junctions
West end
US 12 in Clarkston
Major intersections
SR 193 near Clarkston
East end
SH-128 at Idaho state line near Clarkston
Location
Country
United States
State
Washington
Highway system
State highways in Washington
Interstate
US
State
Scenic
Pre-1964
1964 renumbering
Former
← 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.
^Washington State Department of Transportation (2006). "State Highway Log: Planning Report, SR 2 to SR 971" (PDF). Retrieved June 4, 2009.
^Washington State Legislature. "RCW 47.17.255: State route No. 128". Retrieved June 4, 2009.
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