Washington State Route 173

State Route 173
SR 173 is highlighted in red.
Route information
Auxiliary route of SR 17
Maintained by WSDOT
Length	11.86 mi[1] (19.09 km)
Existed	1964[2]–present
Major junctions
South end	SR 17 in Bridgeport
North end	US 97 in Brewster
Location
Country	United States
State	Washington
Counties	Douglas, Okanogan
Highway system
State highways in Washington Interstate US State Scenic Pre-1964 1964 renumbering Former
← SR 172 → SR 174

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.