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Commissioners review replacement options after severe corrosion closes Bridge 9G1 near Plum Creek Road
Summary
Staff told commissioners that element‑level inspection found severe corrosion that led to the closure of Bridge 9G1 and presented three replacement approaches with different permitting and funding implications.
Miami County commissioners on July 16 were briefed on Bridge 9G1 (330 Fifth Street, about 385 feet east of Plum Creek Road), which county staff closed earlier this year after detailed inspection revealed severe section loss in stringers and girders.
County bridge staff described the April element‑level inspection and showed photos of stringers with substantial corrosion. "This is one of the stringers, mid span, 100% section loss," the presenter said. Staff explained element‑level inspections now require cleaning and touching structural members, which revealed corrosion previously obscured by debris.
Replacement options and costs Staff outlined three general options: (1) low‑water crossing using multiple large steel culvert “rail car” tubes (the example shown used six tubes); (2) a steel‑girder replacement that would have to be designed to allow floodwaters to pass and would use a lightweight metal grating deck; or (3) a conventional single‑span bridge or box…
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