INDOT: Interstate construction averaged $46M per centerline mile in FY2026, up nearly 450% since 2015
According to the Indiana Capital Chronicle, Indiana spent an average of $46 million to construct a centerline mile of interstate in the 2026 state fiscal year (ended June), a rise from $8.4 million in fiscal 2015. The figures cover full reconstructions and added travel-lane projects.
According to the Indiana Capital Chronicle, the Indiana Department of Transportation’s reported average construction cost was $46 million per centerline mile in the 2026 state fiscal year (ended June). That average includes full reconstruction and added travel-lane work and was affected by two complex projects cited by INDOT: Revive I-70 in Wayne County and Safer Drive 65 in Scott and Clark counties.
The article attributes rising costs to inflation in material prices, supply-chain shortages and the pandemic, and notes heavy demand for steel, concrete and equipment — including competition from data centers. It cites the Federal Highway Administration’s national highway construction cost index rising more than 60% from 2020 through 2025, and it notes INDOT’s use of project bundling, competitive bidding, alternative delivery and 20-year asset-management plans.
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