 SR 231 was established in 1964 , but sections of the current route have been in the state highway system as early as 1909 , when State Road 7 was established and included a section near Reardan . In 1913 , the Inland Empire Highway was established and connected Loon Lake to Springdale and Chewelah . A county @-@ maintained road connected Sprague to Browns Lake by 1919 and in 1923 , State Road 7 became State Road 2 and the Inland Empire Highway became State Road 3 . The U.S. route system was formed in 1926 and two highways , numbered U.S. Route 10 ( US 10 ) and U.S. Route 395 ( US 395 ) , were co @-@ signed with State Roads 2 and 3 , respectively . State Road 2 became Primary State Highway 2 ( PSH 2 ) in 1937 and a secondary route , Secondary State Highway 2G ( SSH 2G ) was created , extending from Sprague to Reardan , in 1937 . State Road 3 became PSH 3 during the same year and a secondary route , SSH 3J , was also established to span from the Little Falls Dam at Long Lake to Springdale . 
