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Kelly Toponce bridge temporarily closed after engineers warn of scour and imminent failure
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Summary
Engineers found scour and structural movement at the Kelly Toponce bridge over the Portneuf, estimating replacement at about $2.26 million; commissioners voted to temporarily close the bridge and directed Road & Bridge to shut it down immediately.
Engineers recommended a temporary closure of the Kelly Toponce bridge after finding structural scour and movement that could lead to sudden failure.
Jake Poulsen of Keller & Associates told the Caribou County Board of Commissioners that inspections showed the bridge is deteriorating and "it is failed and could go at any time." He estimated a replacement cost of approximately $2,260,000. The board voted to temporarily close the bridge effective April 14 and directed Road & Bridge to implement the closure and post restrictions.
Commissioner Bryce Somsen moved to temporarily close the Kelly Toponce bridge; the motion passed. Road & Bridge Supervisor Kevin McLain said he would take immediate steps to close and secure the crossing.
Why it matters: County officials said the bridge’s condition presents a public-safety risk for vehicular traffic, and the estimated replacement cost will require budgeting and likely outside funding. Jake Poulsen recommended continued hydraulic review, and county staff said they will coordinate further assessments and traffic detours.
Next steps: County staff will close the crossing, post weight/closure notices and continue engineering work to define replacement options and funding needs. The board asked staff to keep the public informed about detours and the project schedule.