Washington State Route 128

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
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.