State Route 397 is a state highway in the U.S. state of Washington, serving the Tri-Cities region. It primarily functions as a truck route through industrial areas in Finley, Kennewick, and Pasco, running between junctions with Interstate 82 and I-182. The highway crosses the Columbia River on the Cable Bridge, built in 1978 to replace an earlier bridge. SR 397 was added to the state highway system in 1991, as a short route connecting Finley to Pasco. Two years later, the highway was extended further south into Finley. The remaining highway between I-82 and Finley in the Horse Heaven Hills was constructed by the state government and Benton County from 2004 to 2008 and was signed as part of SR 397 in 2009.
Route description
SR 397 begins at an interchange with I-82 and U.S. Route 395 in the Horse Heaven Hills southwest of Kennewick. The highway runs east along the barren top of the ridge, arcing to the north, crossing several canyons and gulleys, and traveling through several cuts in the hills. The road takes a turn north at Nine Canyon, descending into the predominantly rural Finley area. SR 397 turns east to cross an irrigation canal and a section of the Fallbridge Subdivision railroad operated by the BNSF Railway, which also carries Amtrak's Empire Builder service. After passing several chemical plants and industrial facilities on the west bank of the Columbia River, the highway turns northwest onto Chemical Road and follows the railroad into Kennewick. The highway skirts the east side of downtown Kennewick, running along Gum Street through an industrial park on the north side of the railroad. Its main connection to downtown Kennewick is Columbia Drive, which continues west to Clover Island and the junction of US 395 and SR 240 near Columbia Park. SR 397 then crosses the Columbia River on the Cable Bridge, the first modern cable-stayed bridge to be constructed in the United States. The bridge's north end is in Pasco, where SR 397 turns east on Ainsworth Street and crosses over the BNSF Lakeside Subdivision before continuing north. The highway travels around the south and east edges of downtown Pasco on Oregon Avenue, serving the Port of Pascoindustrial area and the east side of a railyard and the city's Amtrak station. SR 397 makes a gradual turn to the northeast before terminating at a cloverleaf interchange with I-182, US 12, and US 395 near the Tri-Cities Airport. SR 397 is maintained by the Washington State Department of Transportation, which conducts an annual survey on the state's highways to measure traffic volume in terms of average annual daily traffic. The highway's daily vehicle counts range from a minimum of 760 vehicles in Nine Canyon to a maximum of 18,000 on the north side of the Cable Bridge.
History
The Cable Bridge, which carries SR 397 across the Columbia River, was opened on September 16, 1978, and built using $30 million in federal, county, and city funding. It replaced the "Green Bridge", which was built in 1922 and carried a section of the Inland Empire Highway until the opening of the Blue Bridge in 1954. Chemical Road was built in the late 1950s to serve a number of new industrial facilities in Finley, following the general path of the Spokane, Portland and Seattle Railway towards Kennewick. The county government had previously considered paving nearby roads as early as the 1910s. The county government constructed a $82,000 railroad overpass and several realigned sections of Chemical Road that were completed in 1965. The state legislature designated a state highway on Chemical Road and the Cable Bridge in 1991, numbering it SR 397. The road and bridge were transferred to state control in April 1992, originally terminating at Game Farm Road in central Finley. SR 397 was extended south by to Piert Road in 1993. An east–west road connecting Finley to I-82 in southern Benton County was first proposed by the county government in 1966 to allow truck traffic to bypass the Tri-Cities. The highway, named the "intertie", was built with lanes and shoulders to accommodate truck traffic; additionally, several streets in Kennewick and Finley were extended to connect with the new road. The $15.4 million project was funded using a $5 million allocation from the legislature's 2003–05 transportation budget, as well as $4.3 million from the state gas tax, $3.7 million from Benton County, and additional funds from the Port of Kennewick and the federal government. The first phase, a section between I-82 and Olympia Street, began construction in March 2004 and was completed in October. The second phase, extending to Finley Road on the south side of Nine Canyon, began construction in 2005 and was completed in November 2006. The final phase, connecting to SR 397 in Finley via a railroad overpass, was completed on October 8, 2008. The highway was initially signed as a county route until it was transferred to the state by a legislative action in 2009 extended SR 397 to the Locust Road interchange.
