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Estimate: Culverton Road box culvert now at roughly $340,000, MDT review pending
Summary
County engineers told commissioners a Culverton Road box culvert with a 10% contingency is estimated at about $340,000 and that final approval and bidding depend on an MDT environmental clearance and coordination about a detour that may avoid BLM permits.
County engineering staff briefed the board on the Culverton Road box culvert design and an updated cost estimate that includes a 10% contingency. "Our cost with the 10% contingency is at 340,000 for that box," Speaker 4 said, noting the design memo outlines culvert sizing and that MDT had provided comments staff would address before resubmitting for final review.
The group discussed routing a temporary detour. Speaker 4 reported the Bureau of Land Management preferred that any detour remain inside the existing right-of-way to avoid BLM permitting; staying inside the right-of-way would lengthen construction and raise costs, staff said. Commissioners asked staff to update MDT and the BLM as plans are revised and to include milestones and timing constraints in bid documents.
