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County engineer flags $340,000 estimate for Bridge 340 and BLM detour permitting concerns
Summary
Staff told commissioners Bridge Project 340 has an estimated cost of about $340,000 (10% contingency) and recommended staying inside the existing right‑of‑way to avoid lengthy BLM permitting for a detour; county staff expects to advertise the project late April and target completion by Oct. 1.
Prairie County staff told commissioners that Project 340 is ready for another MDT submission after addressing comments and that the current estimate, including a 10 percent contingency, is roughly $340,000. Staff said they will resubmit to the Montana Department of Transportation (MDT) prior to advertising the project.
The conversation focused on detour routing. Staff reported BLM staff preferred that any detour remain inside the existing right‑of‑way so a temporary‑use agreement would not be required. Keeping a detour inside the right‑of‑way would require a single‑lane, staged traffic sequence and could elongate construction and add cost. "Our cost with the 10% contingency is at 340,000," a presenter said while reviewing the design memo and contingency allowance.
Staff estimated the county could advertise late April, with contractor work possibly starting mid‑summer; typical contract times discussed were 75–90 days and an October 1 completion target was mentioned to avoid irrigation season impacts. Commissioners asked staff to document schedule milestones and to coordinate with landowners and MDT prior to final advertisement.
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