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.
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