Minnehaha Creek Bridge Replacement Project

Minnehaha Creek Bridge Replacement Project

Caltrans proposes to replace the existing scour critical bridge with a new single-span, pre-stressed, concrete-slab bridge. A two-stage construction method will be used. The west side of the roadway will be widened by four feet to conform to the new bridge width. Widening conform will start 100 feet before the bridge and end 100 feet past the bridge. Bridge removal and reconstruction activities will include temporary falsework, pile driving, structure excavation and backfill for abutment foundations, construction of a cast in place concrete slab, and replacement of the rock embankment, protection, foundations, construction of a cast in place concrete slab, and replacement of the rock embankment protection. Roadway cut and fill to facilitate conforming the roadway to the new bridge - activities include material disposal and borrow, pavement grinding, tree and vegetation removal, and tree and vegetation replanting. Required incidental work, to facilitating construction, includes utility relocation, staging and equipment storage areas, (construction of) temporary access road and temporary stream crossing, and clear diversion and / or de-watering. A continuous, six month, in channel work window is needed to complete the bridge construction. The bridge replacement will occur in two stages. First, traffic will be shifted to one side of the existing bridge while the first half of the new bridge is constructed. Then traffic will be shifted onto the newly constructed side while the other half of the new bridge is constructed. During construction only one lane will be opened to traffic controlled by temporary signals.

Trinity

Cal Fire, California Department of Conservation (DOC), California Department of Fish and Wildlife, Northern and Eureka Region 1 (CDFW), California Department of Parks and Recreation, California Highway Patrol, California Native American Heritage Commission (NAHC), California Regional Water Quality Control Board, North Coast Region 1 (RWQCB), California State Lands Commission (SLC), Department of Water Resources, Resources Agency

Transportation:Other (Bridge Replacement Project)

Hazards & Hazardous Materials, Hydrology/Water Quality