The Trancas Street Bridge scour repair project consists of placing riprap around Pier Number 3 of the Trancas Street Bridge due to erosion at the base of the pier. Activities would involve placement of large rocks (loose riprap) to cover the top of the Pier Number 3 footing. The riprap would be 2 ft 6 inches deep with an apron outside of the pier footing that would slope downward toward the ebb and flow direction of the Napa River. A 5 ft deep cutoff trench would be excavated arounf the perimeter of the riprap and filled with rock to minimize the potential for future undermining of the riprap and pier. The needed repairs would require dewatering of a portion of the river, and a 400 ft long and 8 ft wide construction access road would be extended from an existing gravel road located north of the bridge and into the river from the west bank.
Napa River, Redwood Creek, Napa Creek, Milliken Creek
Notice of Completion
State Review Period Start
State Review Period End
State Reviewing Agencies
California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW), California Department of Parks and Recreation, California Department of Transportation, District 4 (DOT), California Highway Patrol, California Native American Heritage Commission (NAHC), California Regional Water Quality Control Board, San Francisco Bay Region 2 (RWQCB), California State Lands Commission (SLC), Department of Toxic Substances Control, Department of Water Resources, Resources Agency, California Department of State Parks, Division of Boating and Waterways
State Reviewing Agency Comments
California Department of State Parks, Division of Boating and Waterways
Other (public safety-bridge scour repair)
Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Drainage/Absorption, Flood Plain/Flooding, Geology/Soils, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Schools/Universities, Transportation, Vegetation, Wetland/Riparian, Wildfire, Greenhouse gas
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