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MoDOT details $600 million-plus I‑70 rebuild and local interchange work affecting O'Fallon
Summary
MoDOT's area engineer presented a multi-year design-build plan that MoDOT called one of its largest investments, describing widened lanes, a major interchange, chemically treated subgrade and a phased schedule that targets overall completion in 2028 with some sections opening sooner.
MoDOT's area engineer, Andy, told the Public Works Advisory Committee on July 16 that the statewide I‑70 program has moved into an aggressive construction phase and that the St. Louis District projects together represent roughly a $600,000,000 investment that will remake segments of I‑70 and related I‑64 links.
Andy said the state-led program aims to provide three 12‑foot lanes in each direction in many places, expanded shoulders, and major interchange work that blends previously separate projects into a single design‑build delivery. "Everything you see on the screen... plays well together," he said, calling the package "the largest project in MoDOT history." He also described pavement work that includes a 9–12 inch…
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