Project Background

WYDOT completed a study in 2008 that evaluated transportation needs for the I-25/I-80 interchange and the most effective way to address those needs. The study included a robust alternatives screening process that ultimately recommended that the existing cloverleaf interchange be replaced with an improved design that will increase safety, accommodate future traffic demands, and support Cheyenne’s development

The alternatives evaluation conducted in the 2008 interchange study is being revisited as part of the National Environmental Policy Act (NEPA) Environmental Assessment process, currently underway for the interchange replacement. (For more information about NEPA, visit The project design team is also evaluating ways to optimize interchange improvements while minimizing disruption to environmental resources and adjacent communities.

Download 2008 interchange study