California Highway Route 139 from Susanville to the Oregon Border has the distinction of being one of the top five loneliest (least travelled) roads in the United States.  The 143 mile route between Susanville to Malin, Oregon was a long slow process to construct. It started as Lassen-Modoc Joint Highway #14 when it was created in 1929. It was not finished until 1956 and in 1959 it was designated 139.

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