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Boardman TAC narrows shortlist of interchange concepts, directs operational study of roundabouts and loop ramps
Summary
Technical advisory group reviewed a dozen interchange concepts for the Main Street / I‑84 interchange and asked staff to pursue operational modeling of large shared‑roundabout variants and a loop‑ramp alternative that could be staged to defer bridge reconstruction.
The Boardman Technical Advisory Committee met to evaluate 12 interchange concepts for the Main Street / I‑84 interchange and to weigh tradeoffs between preserving access to Front Street and meeting forecast traffic growth.
Project staff summarized PAC feedback earlier that day and told the TAC that property owners and business operators strongly urged maintaining Front Street access. “We had… good participation, from several key property owners and business owners in the city,” the project lead said, noting PAC members’ concern that several concepts would eliminate Front Street movements. TAC members asked staff to refine a short list of alternatives — including large shared roundabouts, mixed signal/roundabout solutions, and a loop‑ramp concept — and to return with operational modeling that shows which options meet capacity and safety goals without unnecessary property impacts.
The consultant team cautioned that most alternatives would affect the Main Street overpass and may require bridge widening or replacement in the long term. ODOT and technical staff emphasized design and policy tradeoffs: roundabouts can reduce conflict points and maintenance needs but may require larger footprints and must satisfy FHWA access rules if local and freeway flows are combined. Staff said a memo summarizing PAC and TAC feedback and refined sketches would be published within two weeks and that recordings and the meeting packet would be posted to the project’s strategic planning page.
