Flume 45 Critical Water System Infrastructure Project

Flume 45 Critical Water System Infrastructure Project

Flume 45 is a critical component of the El Dorado Irrigation District's water conveyance system for the El Dorado Hydroelectric Project (Project 184). The Project would remove the existing wooden flume, which is highly susceptible to damage and destruction by natural hazards including wildfires, landslides, and falling trees and rocks, and replace it with a more durable ignition resistant concrete conveyance structure (i.e., U shaped concrete canal). The Project requires the removal and demolition of approximately 1,140 linear feet of water conveyance, which includes a wooden flume, wooden substructure, and a historic hand-stacked rock wall. Construction of the new conveyance structure involves construction of a mechanically stabilized earth retaining wall, construction of a new U-shaped concrete canal, slope stabilization, replacement of an existing maintenance access bridge that spans the water conveyance structure, and improvements along a maintenance access road adjacent to the flume. As part of the Project, EID would also perform routine road maintenance activities along the primary access road to allow for construction and continued maintenance access to the new canal segment. The Project would be constructed during the District’s annual maintenance outages, beginning in August 2026 and ending in January 2028. The first construction period would occur between August 2026 and January 2027 and the second would occur between August 2027 and January 2028.

Riverton

El Dorado

Countywide

California Air Resources Board (ARB), California Department of Conservation (DOC), California Department of Fish and Wildlife, Habitat Conservation Planning (CDFW), California Department of Fish and Wildlife, North Central Region 2 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of State Parks, Division of Boating and Waterways, California Department of Toxic Substances Control (DTSC), California Department of Transportation, District 3 (DOT), California Department of Water Resources (DWR), California Energy Commission, California Fish and Game Commission (CDFGC), California Governor's Office of Emergency Services (OES), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Public Utilities Commission (CPUC), California Regional Water Quality Control Board, Central Valley Sacramento Region 5 (RWQCB), California State Lands Commission (SLC), Central Valley Flood Protection Board, Delta Protection Commission, Delta Stewardship Council, Office of Historic Preservation, San Francisco Bay Conservation and Development Commission (BCDC), Sierra Nevada Conservancy, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Drinking Water, District 9, State Water Resources Control Board, Division of Water Quality, State Water Resources Control Board, Division of Water Rights, State Water Resources Control Board, Divison of Financial Assistance

Other (Water Conveyance)

Water conveyance flume replacement

Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Drainage/Absorption, Geology/Soils, Hazards & Hazardous Materials, Hydrology/Water Quality, Tribal Cultural Resources, Wildfire