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Illinois Route 251: Map


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Illinois Route 251 is a north-south state road that runs on the former alignment of U.S. Route 51 before Interstate 39 was built in central Illinoismarker. It runs from U.S. 51 at the border with Wisconsinmarker to I-39 and U.S. 51 south of Kappamarker. Illinois 251 is long.

Route description

Illinois 251 runs parallel to Interstate 39 and U.S. 51 for most of the length of I-39 in Illinois. Like Illinois Route 351, it can be considered a spur or loop of its parent route, U.S. 51. Illinois 251 terminates about north of the southern terminus of I-39.

The road parallels the Rock River through Rockfordmarker on the east side. Illinois Route 2 follows the west side of the Rock River.


Illinois 251 was established in 1984 when first segment of I-39 opened between Rockfordmarker and Bloomingtonmarker. In 1992, the final segment of I-39 opened north of Bloomington. The remaining stretch of Former U.S. 51 became Illinois 251. The initial designation of I-39 was U.S. Route 51 until 1992.

External links


  1. AARoads. Interstate 39 @

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