Interchange Justification report

A draft Interchange Justification Report for I-35/I-80 and Iowa Highway 141 (Rider Corner) is now available for review. Future plans for the Rider Corner interchange are of interest to the citizens of Johnston, Grimes and Urbandale. The interchange plans include the addition of an interchange at Northwest 100th Street.

The Iowa DOT has worked with HR Green, a Johnston based company and JEDCO Member to complete environmental documentation and the Interchange Justification Report for the Rider Corner projects. The Iowa DOT held a public meeting in May to receive public comment on the proposed alternatives. The Interchange Justification Report identifies Alternative 2 as the preferred option for the project. According to the DOT this alternative best met the operational goals for the 2040 forecasted traffic and provided additional safety benefits to the system.

Alternative 2 includes adding a flyover ramp from northbound I-35/80 to northbound Iowa 141, removing the loop ramps at the I-35/I-80 and Iowa 141 interchange, and adding a half diamond interchange at Meredith Drive. In addition a full diamond interchange would be included at Northwest 100th Street. These Interstate improvements must be approved by the Federal Highway Administration. We will provide you with more information on this project as it becomes available.

To review a draft copy of the Interchange Justification Report visit the Iowa DOT web site.