July 7, 2013: When US 30 was taken off the Lincoln Highway in Tama County in 1954, Montour was left behind. The Iowa Highway Commission took the IA 135 number from Le Grand and moved it east. At first, 135 went northeast out of Montour, along what is now E Avenue. This old truss bridge across the Iowa River is along that route.
In 1962, the state paved a road northwest out of Montour to US 30, along the 1913 route of the Lincoln Highway. The gravel road and bridge reverted to county control.