 Although SR 231 was established in 1964 , the US 2 concurrency has existed as State Road 7 since 1909 . Later , Secondary State Highway 2G ( SSH 2G ) and Secondary State Highway 3J ( SSH 3J ) were established in 1937 and formed SR 231 in 1964 . The highway crosses the Spokane River on the Spokane River Bridge at Long Lake Dam , which was constructed in 1949 and added to the National Register of Historic Places in 1995 before repair work in late 2008 . 
