The 34th meridian west from Washington is an archaic meridian based on the Washington Meridian and hence 111°2′48.0″ West of Greenwich. [1] The meridian is most notably used as a boundary for four states. The east-west continental divide of North America crosses the 34th meridian at the tripoint between Idaho, Montana and Wyoming.
The meridian was first used as a boundary when the Montana Territory was created in 1864. It served as Montana Territory's extreme southwestern boundary. [2] The next usage of the boundary came when the Wyoming Territory was established in 1868, with the meridian as its western boundary. [3] It was also at this time that it became much of the then- Idaho Territory's eastern boundary, as well as the extreme northeastern boundary of the then- Utah Territory. Montana became a state in 1889, with Idaho and Wyoming following the year afterwards. [4] [5] [6] Utah became a state in 1896. [7]
In the present day, the meridian is used as Wyoming's western border with Montana, Idaho and Utah.
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