Washington State Route 397
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| Route information | ||||
| Defined by RCW 47.17.577 | ||||
| Maintained by WSDOT | ||||
| Length: | 22.31 mi (35.90 km) | |||
| Existed: | 1991 – present | |||
| Major junctions | ||||
| South end: |
  I‑82 / US 395 near Finley
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| North end: |
  I‑182 / US 12 / US 395 in Pasco
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State Route 397 (SR 397) is a state highway in Benton and Frankin counties, in the U.S. state of Washington. It extends 22.31 miles (35.90 km) from Interstate 82 east towards Piert Road in Finley before going north on the Cable Bridge over the Columbia River, to Interstate 182 (I-182), U.S. Route 12 (US 12), and US 395 in Pasco. The route serves as a connector between Finley, Kennewick, and Pasco. The road that SR 397 uses, Chemical Drive, continues for 190 feet (58 m) east from Piert Road/SR 397 to South Piert Road.
SR 397 was approved by the Washington State Legislature in 1991, about 1 mile (1.6 km) shorter. Even though SR 397 was approved by the Washington State Legislature and the Washington State Department of Transportation (WSDOT) in 1991, no signs went up until the law that made SR 397 took effect on April 1, 1992. Later in 1993, the Legislature extended SR 397 to its current southern end. WSDOT and Benton County are currently constructing a connection between I-82 and US 395 and SR 397, dubbed the I-82 to SR 397 Intertie, officially County Route 397 by WSDOT and the Transportation Improvement Board, which is a bypass through the eastern area of the Horse Heaven Hills, located west of SR 397, I-82, and US 395. The road, when completed, will start at I-82/US 395 south of Kennewick, and is expected to go northeast and then curve southeast and then eastward into Finley and onto SR 397.
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