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Public works details bridge foundation revisions, dam options and several road project completions
Summary
County public works staff reported changes to bridge foundation design (drill shafts likely preferred over H-piles), possible use of chromium reinforcement bars, multiple road projects nearing completion and a planned environmental-review role for the county on the dam removal EAW.
Blue Earth County public works staff told the board on Sept. 9 that a complex bridge-and-dam project will require revised foundation designs, that the county has received regulatory feedback favoring natural-channel approaches over heavy rock armoring, and that the county will serve as the Responsible Government Unit (RGU) for an Environmental Assessment Worksheet (EAW) for the dam work.
Why it matters: The bridge and dam work affects project cost, schedule and regulatory approvals and could change the county’s capital and permitting approach for the river crossing and dam removal.
Ryan Till, Blue Earth County engineering and public works director, reported that the current bridge foundation design using H-piles is likely to shift to drilled shafts because of scour concerns and the costs of…
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