Washington State Route 173
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SR 173 is highlighted in red.
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| Route information | ||||
| Auxiliary route of SR 17 | ||||
| Defined by RCW 47.17.360 | ||||
| Maintained by WSDOT | ||||
| Length: | 11.86 mi (19.09 km) | |||
| Existed: | 1964 – present | |||
| Major junctions | ||||
| South end: |
 SR 17 in Bridgeport
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| North end: |
 US 97 in Brewster
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| Location | ||||
| Counties: | Douglas, Okanogan | |||
| Highway system | ||||
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State Route 173 (SR 173) is an 11.86-mile-long (19.09 km) state highway serving Douglas and Okanogan counties in the U.S. state of Washington. The highway travels northwest along the Columbia River from SR 17 in Bridgeport to U.S. Route 97 (US 97) in Brewster. It serves as an alternate route to SR 17, which travels north of the Columbia River, and serves the Chief Joseph State Park and the Bridgeport Bar State Wildlife Recreation Area. SR 173 was established during the 1964 highway renumbering and codified in 1970, but it has been a part of the state highway system since 1931 as a branch of State Road 10, later Primary State Highway 10 (PSH 10). The highway crosses the Columbia River on the Brewster Bridge, which originally opened in 1928 and was destroyed in 1967 before being re-built a decade later.
SR 173 begins at an intersection with SR 17 southwest of the Bridgeport Bridge in Bridgeport, a city in rural Douglas County. The two-lane street travels northwest through Bridgeport as Foster Creek Avenue and turns northeast onto 17th Avenue and later northwest as Columbia Avenue to Bridgeport Park, where SR 173 turns southwest onto 10th Street and Maple Street to leave the city. The highway turns northwest, following the Columbia River towards Chief Joseph State Park. SR 173 continues west, forming the southern boundary of the Bridgeport Bar State Wildlife Recreation Area before crossing the Columbia River into Okanogan County on the Brewster Bridge. The highway enters Brewster and becomes Bridge Street, traveling north over Swamp Creek to end at an intersection with US 97.
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