Segment 1: South corridor

The Segment 1 study area begins south of Sergeant Bluff and ends approximately one-quarter mile south of the Burlington Northern Santa Fe (BNSF) Railroad bridge over the Missouri River. The project area encompasses the existing Singing Hills interchange and U.S. 20 interchange.

The proposed improvements to this segment include upgrading mainline I-29 from four lanes to six lanes and upgrading several ramps of the Singing Hills and I-129/U.S. 20/U.S. 75 interchanges.

A categorical exclusion has been approved discussing the environmental constraints within the Segment 1 study area. Categorical exclusions are a category of actions that do not individually or cumulatively have a significant effect on the environment, and for which neither an environmental assessment nor an environmental impact statement is required.

Final design of Segment 1 is underway with construction likely to begin in 2011.