Washington State Route 260
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SR 260 is highlighted in red.
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| Route information | ||||
| Auxiliary route of SR 26 | ||||
| Defined by RCW 47.17.475 | ||||
| Maintained by WSDOT | ||||
| Length: | 37.98 mi (61.12 km) | |||
| Existed: | 1964 – present | |||
| Major junctions | ||||
| West end: |
 SR 17 near Connell
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 US 395 in Connell SR 21 in Kahlotus SR 263 in Kahlotus
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| East end: |
  SR 26 / SR 261 in Washtucna
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| Location | ||||
| Counties: | Franklin, Adams | |||
| Highway system | ||||
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State Route 260 (SR 260) is a 37.98-mile-long (61.12 km) state highway serving Franklin and Adams counties in the U.S. state of Washington. The highway begins at SR 17 west of Connell, and travels through the Washtucna Coulee to Kahlotus, forming the southern terminus of SR 21 and the northern terminus of SR 263, before a concurrency with SR 261 to SR 26 in Washtucna.
SR 260 had previously existed as a gravel road between Connell and Kahlotus in 1916 and was designated as Secondary State Highway 11A (SSH 11A) from Yakima to Connell and Secondary State Highway 11B (SSH 11B) from Connell to Washtucna in 1937. SSH 11A in the Connell area became an extension of SSH 11B in 1957, which in turn became SR 260 in the 1964 highway renumbering.
State Route 260 (SR 260) begins at an intersection with SR 17 west of Connell in rural Franklin County. The highway travels east and turns southeast into Connell, traveling over a rail line owned by BNSF Railway and used on the Amtrak Empire Builder route between Pasco and Spokane. After intersecting U.S. Route 395 (US 395) in the busiest section of the entire route, a diamond interchange that received a daily average of 2,800 vehicles in 2011, the roadway continues east through the Washtucna Coulee and passes south of Sulphur Lake before entering Kahlotus. As SR 260 passes through Kahlotus, it forms the southern terminus of SR 21, going north towards Lind, and the northern terminus of SR 263, serving the Lower Monumental Dam. The road exits the city travelling east to Lake Kahlotus and Washtucna Lake, paralleling the Columbia Plateau Trail northeast to the beginning of a concurrency with SR 261. The two highways enter the Adams County city of Washtucna and become Main Street before an intersection with SR 26, where SR 260 ends and SR 261 continues to Ritzville.
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