Indiana Interstate Builds Hit $46M a Mile — 450% Higher Than a Decade Ago

I-69 Corridor Project construction in Monroe County, Indiana (Section 5), July 2017. Photo: ITB495 / Wikimedia Commons (CC0).

I-69 Corridor Project construction in Monroe County, Indiana (Section 5), July 2017. Photo: ITB495 / Wikimedia Commons (CC0).

$46 million. That is what Indiana spent, on average, to build one centerline mile of interstate in the 2026 state fiscal year that ended in June.

A decade earlier the same metric sat at $8.4 million. The jump — nearly 450 percent — showed up on an Indiana Department of Transportation slide at a late-August State Budget Committee meeting and was reported Friday morning by the Indiana Capital Chronicle. Sen. Fady Qaddoura, D–Indianapolis, called the figure “unbelievable.”

The slide the Budget Committee already saw

INDOT spokeswoman Natalie Garrett told the Capital Chronicle the average covers full reconstruction or added-lane work — lane replacements and additions, rebuilt shoulders, barrier walls, guardrails, traffic and drainage control, materials, and labor. Some years had more of those projects, some fewer, and some “none at all,” she said.

Garrett pointed to material inflation, supply-chain shortages, and the pandemic hangover. She also said Indiana is “unique”: the state is adding capacity while peer states lean harder into maintenance or federal bridge work.

FY2026’s average was pulled higher by two complicated jobs — Revive I-70 in Wayne County and Safer Drive 65 in Scott and Clark counties — each requiring heavy maintenance-of-traffic setups on busy corridors, Garrett said. Urban work multiplies engineering, barriers, and material costs.

Capacity first, resurfacing second

Brian Gould, executive director of the Build Indiana Council, told the Capital Chronicle the industry’s post-2017 road-funding law era started with “pretty basic” resurfacing — mill two inches, put down two to four of fresh asphalt. Since then, he said, the state has shifted toward major metro-area capital projects.

“Those are really your two biggest factors when it comes to cost: what do you want us to build, to what scale, and where do you want it located at?” Gould said.

Steel and concrete — the heavy ingredients of interstate and bridge work — have spiked over the last five years on inflation, tariffs, and demand, Gould said. The Federal Highway Administration’s national highway construction cost index rose more than 60 percent from 2020 through 2025.

Same materials, new competitors

Road builders are not the only buyers in the yard. “We’ve had kind of a booming economy here in Indiana, and data centers are consuming as much concrete and steel and asphalt as job sites are, so we’re competing against them as well,” Gould said. Equipment is harder to find for the same reason.

That competition sits beside the same data-center pressure already showing up in rate cases and local moratorium fights. The highway number is the Budget Committee version of the same materials squeeze.

INDOT says it still bids competitively, uses early contractor involvement on complex jobs, and bundles contracts to limit traffic hits. Garrett also noted Indiana’s 20-year asset-management plans for pavement, bridges, and drainage — intervening early, she argued, so assets do not rot into full replacements.

What the slide does not do is shrink the bill already booked. From $8.4 million a mile to $46 million a mile in eleven years, the state’s own presentation put the growth on the table for lawmakers who return in January to write the next budget — while capacity projects, not just patch jobs, keep setting the average.

Reporting: Indiana Capital Chronicle, Oct. 2, 2026, 4:30 AM ET (State Budget Committee INDOT slide, Aug. 27, 2026 meeting); Federal Highway Administration National Highway Construction Cost Index (2020–2025).

Written by Hoosiers, for Hoosiers.