Ewan–Sprague route and the former section to Steptoe became part of an extension of Primary State Highway 18 (PSH 18). SSH 11C was completely removed from the system in 1951, and it took effect in 1961 as the number was reused elsewhere. SR 230 is proposed to connect SR 23 at Ewan to (I-90) in Ritzville, but has not yet been built. Major intersections References External links Highways of Washington State 023 Transportation in Lincoln County, Washington Transportation in Whitman County, Washington