Creek, SR 31 would continue north out of Tiger, which was the eastern terminus of . SR 31 from Newport to Tiger later became SR 20 after it was extended on SR 294 and SR 31 in 1973. SR 311 (1964–1973) From 1964 until 1973, SR 31 had an auxiliary route called State Route 311. The highway ran from US 2 west of Newport, north to SR 31 in Usk. The road was entirely located within Pend Oreille County; the southern terminus was located east of Pend Oreille State Park on US 2 and west of Diamond Lake and the community of the same name. SR 311 advanced north past Sacheen Lake and Davis Lake to the northern terminus, which was south of Cusick. SR 311 was established as in 1937 during the creation of the primary and secondary highway system. In the 1964 renumbering, SR 311 was created over SSH 6B. When SR 20 was extended over SR 294 and SR 31, SR 311 became , which it is still currently designated as. Major intersections References External links Highways of Washington State 031 031 Transportation in Pend Oreille County, Washington