Editing U.S. Route 12 (section)

==History==
Since the highway's creation in 1926, the eastern terminus has always remained within a few blocks of [[Cadillac Square]] in [[Downtown Detroit, Michigan]].<ref>{{cite web |last=Bessert |first=Christopher J. |date=July 5, 2013 |title=US-12 |url=http://www.michiganhighways.org/listings/US-012.html |access-date=January 19, 2014 |work=Michigan Highways |language=en-US |archive-date=December 19, 2013 |archive-url=https://web.archive.org/web/20131219064358/http://michiganhighways.org/listings/US-012.html |url-status=live }}{{self-published source|failed=y|date=January 2014}}</ref>{{self-published inline|failed=y|date=January 2014}}
* 1926: Cadillac Square at the convergence with [[U.S. Route 10|US&nbsp;10]], [[U.S. Route 16|US&nbsp;16]], [[U.S. Route 25|US&nbsp;25]], and [[U.S. Route 112|US&nbsp;112]]; US&nbsp;12 ran along Grand River. The original ending was at [[Miles City, Montana]].
* 1939: The [[American Association of State Highway Officials]] (AASHO) approved a request to extend US&nbsp;12 to [[Yellowstone National Park]].
* 1956: US&nbsp;12 was rerouted along the Lodge Freeway ([[M-10 (Michigan highway)|M-10]]), ending on [[Jefferson Avenue (Detroit)|Jefferson Avenue]]; the terminus moved four blocks southeast, to the corner of Woodward Avenue ([[M-1 (Michigan highway)|M-1]]/US&nbsp;10) and Jefferson Avenue.
* 1959: Extended to [[Missoula, Montana]].
* 1962: After I-94 was completed across Michigan, it was no longer cosigned with US&nbsp;12. The US&nbsp;12 route designation was moved to the former route of US&nbsp;112, which was decommissioned. US&nbsp;12 now runs along Michigan Avenue and again ends at Cadillac Square. It was extended to [[Lewiston, Idaho]].
*1967: Extended to [[Aberdeen, Washington]], to its present terminus at [[U.S. Route 101|US&nbsp;101]].
* 1970: US&nbsp;10 was rerouted from Woodward to the Lodge Freeway and Jefferson Avenue. At this time US&nbsp;12 was apparently extended along Woodward, to again terminate with US&nbsp;10 at Woodward and Jefferson avenues, though with the designations flipflopped from their 1956 routing.
* 2001: The City of Detroit and [[Michigan Department of Transportation|MDOT]], in a series of jurisdictional transfers, moved the terminus back four blocks, to again be at Cadillac Square.
* 2005: In another transfer, the US&nbsp;12 terminus was truncated another four blocks, to end at the [[Patrick V. McNamara Federal Building]], on the corner of Michigan and Cass avenues.

The western terminus was gradually extended westward, until it reached the [[Pacific Ocean]].<ref name="FHWA history">{{cite web |last=Weingroff |first=Richard F. |date=May 7, 2005 |title=U.S. 12 Michigan to Washington |url=https://www.fhwa.dot.gov/infrastructure/us12.cfm |access-date=January 20, 2024 |work=Highway History |publisher=[[Federal Highway Administration]] |language=en-US |archive-date=September 16, 2013 |archive-url=https://web.archive.org/web/20130916063232/http://www.fhwa.dot.gov/infrastructure/us12.htm |url-status=live }}</ref>

===Former ferry crossing===
In 1925, US&nbsp;12 in Michigan was originally proposed to run from Detroit to [[Ludington, Michigan|Ludington]], across [[Lake Michigan]], via the [[Pere Marquette Railway car ferry]] to [[Manitowoc, Wisconsin]], and then continuing into Wisconsin, on what later became US&nbsp;10, in those two states. The 1974 "Golden Anniversary Celebration" reprint of the 1926 Rand McNally Road Atlas shows US&nbsp;12 following what later became the route of US&nbsp;10 through Michigan, from Detroit, through Flint, Saginaw, Midland, and Clare on its way to Ludington.

===Routing changes and proposals===
US&nbsp;12 was proposed to enter [[Wyoming]] on the current route of [[U.S. Route 212|US&nbsp;212]] from [[Mammoth Hot Springs, Wyoming|Mammoth Hot Springs]] to a point northwest of [[Clark, Wyoming|Clark]] before its route in Montana was rerouted.<ref name="FHWA history"/> It was also proposed to enter [[Oregon]] on the current route of [[U.S. Route 730|US&nbsp;730]] from east-southeast of [[Boardman, Oregon|Boardman]] to a point northeast of [[Cold Springs, Oregon|Cold Springs]], but that was canceled.<ref name="FHWA history"/>

In the 1960s, a portion of US&nbsp;12 in Western Washington was moved north to the town of [[Morton, Washington|Morton]], when [[Mossyrock Dam]] was built on the [[Cowlitz River]] in [[Lewis County, Washington|Lewis County]]. A large portion of old, two-lane US&nbsp;12 in the [[Yakima River Valley|Yakima Valley]] was replaced by [[Interstate 82|I-82]] and [[Interstate 182|I-182]] in the 1980s, between [[Yakima, Washington|Yakima]] and the [[Tri-Cities, Washington|Tri-Cities]], though the freeways are still cosigned with the US&nbsp;12 designation. The old two-lane highway now bears the name Wine Country Road.