Washington State Route 23
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SR 23 is highlighted in red.
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| Route information | ||||
| Defined by RCW 47.17.095 | ||||
| Maintained by WSDOT | ||||
| Length: | 66.00 mi (106.22 km) | |||
| Existed: | 1964 – present | |||
| Major junctions | ||||
| South end: |
 US 195 near Steptoe
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  I‑90 / US 395 in Sprague
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| North end: |
 SR 28 in Harrington
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| Location | ||||
| Counties: | Whitman, Lincoln | |||
| Highway system | ||||
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State Route 23 (SR 23) is a 66-mile (106.22 km) long state highway traversing Whitman and Lincoln counties in the U.S. state of Washington. The 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.
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