INDOT: Average interstate construction cost rose to $46M per centerline mile in FY2026

Indiana Capital Chronicle reported Oct. 2, 2026, that the Indiana Department of Transportation’s average cost to construct a centerline mile of interstate was $46 million in the 2026 state fiscal year, which ended in June 2026. The figures represent centerline miles built as part of full reconstruction or added travel lane plans and included projects such as Revive I-70 in Wayne County and Safer Drive 65 in Scott and Clark counties.

The article attributes higher costs to inflation, pandemic-era supply shortages, competition for materials (including demand from data centers), and more-complex urban work that requires expanded traffic-management setups, barriers and engineering. It also reports INDOT bundles and competitively bids projects, uses alternative-delivery models for complex jobs and relies on 20-year asset-management plans to guide maintenance and interventions.

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