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Interstate Bridge Replacement Program estimate jumps to about $14.4 billion; staff warn of multi‑billion funding gaps and a critical federal deadline
Summary
Interim IBR program administrator told the advisory committee the five‑mile program now has a planning estimate of about $14.4 billion (70th percentile), driven by higher construction costs, schedule delays and escalation; staff flagged a ~$500 million federal obligation deadline at the end of September and outlined phasing and procurement milestones.
Carly, interim program administrator for the Interstate Bridge Replacement Program, told the committee that a new cost‑validation process produced a 2026 planning estimate for the five‑mile program of $13.5 billion to $15.2 billion, with a planning figure of $14.4 billion at the 70th percentile.
Carly said the estimate breaks down to a base cost (about $7.8 billion in today’s dollars), program risk ($4.2 billion) and escalation ($2.4 billion). She said construction‑market inflation and a realized two‑year federal environmental review delay are major drivers behind a roughly 58% increase in construction costs since the 2022 estimate.
Program staff described an initial, funded core phase focused on replacing…
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