Granite County: Mullan Trail Culvert & Fish Barrier; The project consists of the removal and disposal of the existing timber fish barrier and corrugated steel roadway culvert and the installation of a new fish barrier structure consisting of an 8-foot span by 5-foot rise by 30-foot long precast concrete box culvert with precast concrete sloped end sections and precast concrete wingwalls. The project is located approximately 10 miles west of Drummond, MT on Mullan Trail over Harvey Creek. Improvements consist of, but are not limited to: structure excavation, structural backfill, existing structure removal and disposal, roadway embankment, riprap, supply and installation of the precast concrete components, gravel surfacing, culvert bedding material, approach guardrail with a stiffened rail section over the culvert, and other miscellaneous items.
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