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State, FHWA and SHPO find Highway 6 bridge over Iowa River eligible; Section 106 process to seek mitigation
Summary
Iowa City staff told the Historic Preservation Commission that the Highway 6 bridge over the Iowa River is National Register‑eligible (1950s era) and that federal Section 106 review concluded replacement would have an adverse effect, obligating DOT and federal agencies to negotiate mitigation with SHPO and consulting parties.
City staff on June 12 briefed the Iowa City Historic Preservation Commission on a Section 106 review for the Highway 6 bridge over the Iowa River and said the project team determined the bridge is historic (National Register listed or eligible) and that replacement or extensive rehabilitation would have an adverse effect on its historic integrity.
Planner Jessica (staff) explained that federal Section 106 review, which applies when a federal agency’s project affects historic properties, requires the lead agency to determine eligibility and whether an adverse effect will occur. The Department of Transportation (DOT) and Federal Highway Administration evaluated options — do nothing, build a new structure at a different location, rehabilitation/repair or construct a new bridge in place — and concluded that rehabilitation would not preserve the…
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