page_title: U.S. Route 12
section_title: Washington
hierarchical_section_title: U.S. Route 12 / Route description / Washington
caption_attribution_description: U.S. Route 12 approaching its terminus in downtown Aberdeen
context_page_description: U.S. Route 12 is an east–west United States highway, running from Aberdeen, Washington, to Detroit, Michigan, for almost 2,500 miles. The highway has mostly been superseded by Interstate 90 and I-94, but unlike most U.S. routes that have been superseded by an Interstate, US 12 remains as an important link for local and regional destinations.
  The highway's western terminus is in Aberdeen, Washington, at an intersection with US 101, while the highway's eastern terminus is in Downtown Detroit, at the corner of Michigan and Cass avenues, near Campus Martius Park.
context_section_description: The western terminus of US 12 is located in Aberdeen, Washington.  In the 1960s, a portion of US 12 was moved north to the town of Morton, when the Mossyrock Dam was built and flooded the towns of Kosmos and Riffe, along the Cowlitz River in Lewis County.  A large portion of old, two-lane US 12 was replaced by Interstate 82 and Interstate 182 in the 1980s, between Yakima and the Tri-Cities, though the freeways are still cosigned with the US 12 designation.  The old two-lane highway now bears the name Wine Country Road.  The highway loosely follows the eastbound leg of the Lewis and Clark Expedition, between Wallula, Washington and Clarkston, Washington, thus being marked as part of the Lewis and Clark Trail.  The east end of the highway in the state is at Clarkston, where the highway crosses the Snake River into Idaho at Lewiston.
  The Washington section of US 12, other than a concurrency with Interstate 5, is defined at Washington Revised Code § 47.17.055.
caption: Western terminus at US 101 in Aberdeen, WA
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