Washington State Route 174 in Leahy is a special route, a numbered highway system that diverts a specific segment of traffic away from another road.
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. Leahy is located at the junction of Washington State Route 17 and Washington State Route 174 14.5 miles (23.3 km) east-southeast of Bridgeport. SR 174 begins at an intersection with SR 17 in Leahy, a small community in Douglas County. Leahy, Washington 2009present The roadway is named Leahy Road and serves as a connector from northbound SR 17 to SR 174. The Leahy spur of SR 174 is a 0.09-mile (0.14 km) long two-lane spur route that was added to the state highway system in 2009. Douglas Leahy SR 17 north  Bridgeport, Chief Joseph Dam Western terminus, at-grade intersection State Route 174 (SR 174) has two spur routes, a type of special route. 
