State Route 174 | ||||
|---|---|---|---|---|
 The Grand Coulee Dam area with SR 174 in red. | ||||
| Route information | ||||
| Auxiliary route of SR 17 | ||||
| Maintained by WSDOT | ||||
| Length | 40.66 mi[1] (65.44 km) | |||
| Existed | 1964[2]–present | |||
| Major junctions | ||||
| West end |  SR 17 in Leahy | |||
 SR 155 in Grand Coulee | ||||
| East end |  SR 21 near Wilbur | |||
| Location | ||||
| Country | United States | |||
| State | Washington | |||
| Counties | Douglas, Grant, Lincoln | |||
| Highway system | ||||
| ||||
State Route 174 (SR 174) is a 40.66-mile (65.44 km) long state highway that traverses Douglas, Grant and Lincoln counties in Washington. SR 174 begins at a junction with SR 17 in Leahy and travels eastward to Grand Coulee, near the Grand Coulee Dam, to intersect SR 155. From Grand Coulee, the roadway travels southeast to end at SR 21 northwest of Wilbur.
Prior to the establishment of SR 174 in a 1964 renumbering, it had been county roads and two highways, Secondary State Highway 10B (SSH 10B) and Secondary State Highway 4C (SSH 4C) from 1937 until 1964. The two highways merged to form SR 174 in 1964 and a branch of SSH 10B became the Crown Point spur of SR 174. A second spur route, located in Leahy, was added in 2009.
- ^ Washington State Department of Transportation (2009). "State Highway Log, 2009" (PDF). pp. 1161–1167. Retrieved November 7, 2010.
- ^ Washington State Legislature (1970). "RCW 47.17.365: State route No. 174". Retrieved November 7, 2010.