Washington State Route 23

State Route 23
SR 23 highlighted in red
Route information
Maintained by WSDOT
Length	66.00 mi[1] (106.22 km)
Existed	1964[2]–present
Major junctions
South end	US 195 near Steptoe
Major intersections	I-90 / US 395 in Sprague
North end	SR 28 in Harrington
Location
Country	United States
State	Washington
Counties	Whitman, Lincoln
Highway system
State highways in Washington Interstate US State Scenic Pre-1964 1964 renumbering Former
← SR 22 → SR 24

State Route 23 (SR 23) is a state highway traversing Whitman and Lincoln counties in the U.S. state of Washington. The 66-mile (106.22 km) highway extends northwest from U.S. Route 195 (US 195) in Steptoe through Sprague to an intersection with SR 28 in Harrington. It serves as a route from Interstate 90 and US 395 in Sprague towards Pullman via US 195, and has a longer child route, SR 231 that travels north from SR 23 near Sprague to Reardan and Chewelah.

SR 23 was formally established in 1964 using roadways that have existed since 1937 as Secondary State Highway 11F (SSF 11C) from Sprague to Harrington and Secondary State Highway 11C (SSH 11C) from Steptoe to Sprague. SSH 11C was removed from Steptoe to Ewan in 1943 and became an extension of Primary State Highway 18 (PSH 18) and was completely designated as PSH 18 in 1953 and removed from the highway system in 1961. A second child route, SR 230, is proposed to be built from Ritzville to Ewan, but has not been built.