High Quality Content by WIKIPEDIA articles! State Route 231 (SR 231) is a 74.97-mile (120.65 km) long state highway in the U.S. state of Washington serving communities in Lincoln and Stevens counties. The highway, located entirely west of Spokane in the Inland Empire, serves Sprague, Edwall, Reardan, Springdale and Chewelah. The route extends from SR 23 north of Sprague to a concurrency with U.S. Route 2 (US 2) near Reardan and an intersection with US 395 south of Chewelah.