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Commissioners agree to split $82,000 County Line bridge study with Bonneville County

Jefferson County Board of Commissioners · July 6, 2026
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Summary

Jefferson County commissioners approved participating in a feasibility study for the County Line (Snake River) bridge, agreeing to fund 50% of the estimated $82,000 study cost ($41,000). Bonneville County will contract for the work and Jefferson will provide its share.

County engineering staff described a proposed feasibility and environmental study for the County Line (Snake River) bridge to determine whether replacement is needed and to complete the environmental groundwork for future federal grant applications. Staff said the full study is estimated at $82,000 and recommended splitting the cost 50/50 with Bonneville County so Bonneville can contract directly with LTAC and the engineering firm.

Commissioners discussed the study scope and the benefit of getting environmental and geotechnical work completed early; one commissioner said replacement remains at least a decade away but that proactive study work is needed to be eligible for federal funding. The board approved the 50% participation and authorized staff to coordinate the payment and project involvement with Bonneville County.

Next steps: Jefferson will transfer a $41,000 share to Bonneville County or to the contracting entity per the interlocal agreement; commissioners asked for language to ensure Jefferson participates in review and decisions on study findings.