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Washington segment of U.S. 197v.2020.07.05.007Google Earth Imagery Date: July 24, 2021
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US 197 enters Washington on The Dalles Bridge, a steel cantilever truss bridge that crosses the Columbia River downstream of The Dalles Dam,[26][27] and travels into Dallesport in Klickitat County.[28] The 2.76-mile-long (4.44 km) highway continues north past Columbia Gorge Regional Airport to its northern terminus, an intersection with SR 14.[3][24][29] US 197 is defined by the Washington State Legislature as SR 197, part of the Revised Code of Washington as ยง47.17.382.[30] Every year, WSDOT conducts a series of surveys on its highways in the state to measure traffic volume, expressed in terms of AADT. In 2012, WSDOT calculated that the Washington section of US 197 served between 3,700 and 6,100 vehicles, mostly on The Dalles Bridge.[31]
US 197 traveled north onto the newly constructed The Dalles Bridge over the Columbia River to US 830 and PSH 8 northeast of Dallesport and traveled east with the two highways to end at US 97 in Maryhill.[33][39] US 830 and its concurrency with US 197 were removed from the U.S. route system in 1968,[40][41][42] leaving US 197 concurrent with the successor to PSH 8, SR 14, after the 1964 state highway renumbering.[43] The concurrency with SR 14 was removed from the Washington state highway system in 1979,[30][44] but remained as a part of US 197 as defined by the American Association of State Highway and Transportation Officials (AASHTO) until September 22, 2006.[45]
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