1st Avenue Interchange

1st Avenue Interchange in Johnson County, Iowa: This interchange, originally constructed in the 1960s, has recently undergone a remarkable transformation to ensure safety and accommodate future traffic demands.

One of the standout features of this project is the elevation of the grade on 1st Avenue. To overcome potential overburden on the buried structures, lightweight cellular concrete was utilized, providing the lightweight backfill to raise the elevation of the existing grade while exerting no additional load on the buried structures underneath. This allowed for the construction of a new embankment, complete with precast panel walls. The beauty of this solution is that it eliminates any concerns of damaging the buried structure on the right of way.

The 1st Avenue Interchange is a shining example of how creative engineering can address challenges while prioritizing safety and efficiency. With its smart design and friendly impact on the community, this interchange is set to gracefully handle projected traffic volumes for years to come.