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County updates Rapidan Dam removal and Casa 9 bridge design; environmental clearances under way
Summary
Public works staff reviewed technical progress on the Casa 9 bridge replacement and Rapidan Dam removal, including foundation design choices, environmental reviews and a recommendation that corrosion‑resistant rebar be considered to extend bridge life.
Ryan Tillges, Blue Earth County engineer and public works director, gave an extended update on the Casa 9 bridge replacement and the Rapidan Dam removal during the Nov. 4 meeting, describing engineering, environmental and schedule work that remains before construction.
Tillges said bridge design work has advanced into structural modeling and that the design team is leaning toward using 8‑foot‑diameter drilled shaft foundations to achieve required bearing and economy. The project team is coordinating hydraulics reviews and constructability with MnDOT and consultants and is also coordinating the bridge work with the separate Rapidan Dam removal so the projects complement each other in the river…
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