I-25 High Plains Road Interchange, Wyoming

Building the first ever roundabouts on the Wyoming highway system

The I-25 and High Plains Road Interchange seven miles south of Cheyenne showcases the first ever roundabouts on the Wyoming highway system. The growing development southeast of Cheyenne prompted the construction of the new interchange, which will relieve traffic at the College Drive Interchange to the north. The east side of I-25 proved too close to the railroad for conventional access, so roundabouts for the intersection of the ramps with High Plains Road solved the right-of-way problem. The Wyoming Department of Transportation awarded the contract to Reiman Corp. with IHC as the paving contractor. Construction of the intersection included placing approximately 27,500 square yards of 10” thick PCCP.

Designed with mountable curb and gutter, the roundabouts also have stamped and stained aprons. Roundabout transitioning to the ramps, bridge, High Plains Road and site work for the Welcome Center provided for creative input. Numerous different paving widths within the ramp configuration were required, so monolithic paving of the ramps was achieved by using multiple pavers in line to accommodate different widths. WYDOT survey was instrumental in the success of the paving due to the grade breaks and transitions.

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