Washington State Route 174
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The Grand Coulee Dam area with SR 174 in red.
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| Route information | ||||
| Auxiliary route of SR 17 | ||||
| Defined by RCW 47.17.365 | ||||
| Maintained by WSDOT | ||||
| Length: | 40.66 mi (65.44 km) | |||
| Existed: | 1964 – present | |||
| Major junctions | ||||
| West end: |
 SR 17 in Leahy
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 SR 155 in Grand Coulee
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| East end: |
 SR 21 near Wilbur
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| Highway system | ||||
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→
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| Location: | Leahy, Washington |
| Existed: | 2009–present |
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| Location: | Crown Point, Washington |
| Existed: | 1964–present |
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.
SR 174 begins at an intersection with SR 17 in Leahy, a small community in Douglas County. The western terminus is only accessible from SR 17 southbound, access from SR 17 northbound is provided by the Leahy spur of SR 174. From Leahy, the highway travels northeastward through grasslands with few farms before turning southeast to intersect its Crown Point spur near the Grand Coulee Dam. The roadway then enters Grant County and the city of Grand Coulee and becomes the Bridgeport Highway. SR 174 continues to the Grand Coulee Dam federal reservation and state maintenance ends through the area. After the gap in maintenance in Grand Coulee, SR 174 travels over the Columbia Basin Canal and intersects with SR 155, which is named Midway Avenue through Grand Coulee. After the intersection, the highway is named Grand Coulee Avenue and passes Grand Coulee Middle School and Skilskin High School before leaving the city and the county. The roadway enters Lincoln County and continues southeast to its eastern terminus, an intersection with SR 21, northwest of Wilbur; SR 21 continues south to intersect with U.S. Route 2 (US 2).
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