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MDT proposes removal of scour-critical Toston structure; locals press for pedestrian access and alternate egress
Summary
Montana Department of Transportation told Broadwater County commissioners it will remove an old scour-critical bridge near Toston at state expense to avoid risk to a new Highway 287 crossing; residents urged MDOT and the county to plan alternate pedestrian routes, emergency egress and speed studies.
Montana Department of Transportation officials told Broadwater County commissioners on Nov. 8 that an old bridge at Toston has been designated "scour critical" and that MDT proposes removing the structure at MDT's expense to avoid the risk it could collapse and damage the nearby new Highway 287 crossing.
"MDT is here to propose removal of that structure at our cost," said Genoliva, the Butte District administrator for MDT. Ryan Dahlke, statewide reconstruction engineer, said replacement of the structure carries a planning-level estimate of about $10 million, while "removal of the structure is a tenth of that," though he said MDT would produce engineering estimates during project development.
MDT said the bridge's foundations sit on spread footings that can become undermined during high river flows. "Just because a bridge is scour critical…
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