Mullan Road

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The Mullan Road was the first first wagon road to cross the Rocky Mountains to the Inland of the Pacific Northwest. It was built by US Army Lieut. John Mullan between the spring of 1859 and summer 1860. It led from Fort Benton, Montana to Fort Walla Walla, Washington Territory, roughly following the path of modern-day Interstate 90 through the Rockies.

Parts of the Mullan Road can still be traveled. One such section is near Washtucna, Washington.

The American Society of Civil Engineers designated Mullan Road a historic civil engineering landmark in 1977.

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