State Route 17 (SR 17) is a state highway serving the Columbia Plateau in the central region of the U.S. state of Washington. The highway travels through mostly rural areas of Franklin. Adams, Grant, Douglas, and Okanogan counties and is designated as part of the National Highway System between Mesa and Moses Lake and as the Coulee Corridor Scenic Byway between Othello and Coulee City for passing through the Grand Coulee. SR 17 begins in Mesa at an interchange with U.S. Route 395 (US 395) and travels north and intersects SR 26 near Othello before entering Moses Lake, where the highway intersects Interstate 90 (I-90) and travels as a partial expressway. SR 17 continues north, intersecting SR 28 in Soap Lake, through the Grand Coulee to a short concurrency with US 2 west of Coulee City. The highway turns northwest and crosses the Columbia River on the Columbia River Bridge at Bridgeport before ending at US 97 in Brewster at the southwestern edge of the Colville Indian Reservation. SR 17 was established during the merger of three highways during the 1964 highway renumbering: Secondary State Highway 11G (SSH 11G) between Eltopia and Soap Lake, a branch of Primary State Highway 7 (PSH 7) between Soap Lake and Coulee City, and a branch of PSH 10 between Coulee City and Brewster. The PSH 10 branch was codified in 1931 as a branch of State Road 10 and was followed by the PSH 7 branch during the creation of the primary state highway system in 1937. The Columbia River Bridge at Bridgeport was completed in 1950 and the PSH 10 branch was re-aligned onto the north side of the Columbia River the following year. SSH 11G was created in 1951 and was moved to a wider, straighter route between Moses Lake and Soap Lake in the 1960s. The highway was replaced by a limited-access highway north of Moses Lake in 2007. SR 17 between Eltopia and Mesa was replaced by US 395 in 1979 as part of a larger series of projects in the area to improve the highway in Franklin County. Route description SR 17 begins at a diamond interchange with US 395 southeast of Mesa in Franklin County. The highway travels northwest through Mesa, where it crosses over a BNSF rail line and runs through Esquatzel Coulee before intersecting the terminus of SR 260 west of Connell in the Paradise