Washington State Route 129
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| Route information | ||||
| Defined by RCW 47.17.260 | ||||
| Maintained by WSDOT | ||||
| Length: | 42.55 mi (68.48 km) | |||
| Existed: | 1964 – present | |||
| Major junctions | ||||
| South end: |
 OR 3 at Oregon state line near Anatone
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| North end: |
 US 12 in Clarkston
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| Location: | Clarkston |
| Existed: | 1970–present |
State Route 129 (SR 129) is a state highway in the U.S. state of Washington, located in Asotin County. It extends 42.55 miles (68.48 km) from Oregon Route 3 (OR 3) at the Oregon state line south of Anatone, Washington, north to U.S. Route 12 (US 12) in Clarkston, Washington.
SR 129 serves as a connecting road between Enterprise, Oregon and Clarkston and was originally part of Primary State Highway 3's Clarkston branch (PSH 3 DC) from 1937 until 1964, which ran from the Oregon state line to Dodge. PSH 3 DC was decommissioned in 1964, when a highway renumbering occurred, which created SR 129. SR 129 also has its own spur route located in Clarkston.
SR 129 is a highway that begins at OR 3 at the Oregon state line south of Anatone, Washington, and heads north to US 12 in Clarkston, serving as a link between the two towns. The Washington State Department of Transportation (WSDOT) found that about 9,300 motorists use the road daily beyond its intersection with Sixth Street in Clarkston based on average annual daily traffic (AADT) data.
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