Big Tujunga Reservoir Restoration Project

Big Tujunga Reservoir Restoration Project

The proposed Project involves the removal of sediment from the Big Tujunga Reservoir (BTR) and placement of the sediment in the adjacent Maple Canyon Sediment Placement Site (SPS), which is located approximately 1.9 miles (when traveling via existing access roads) from BTR to the upper reach of Maple Canyon SPS. Maple Canyon SPS can accommodate approximately 4.4 million cubic yards (mcy) of additional sediment, which would bring the SPS to its ultimate planned sediment capacity. The Project involves the use of trucks and equipment to remove sediment and restore capacity to the BTR, and to allow it to adequately perform its main functions of flood control and water conservation. The following minor activities would occur in conjunction with the proposed sediment removal: (1) hydroblasting to flush a stilling well on the dam crest; (2) repairing the hydraulic sluicegate; (3) paving the unpaved sections of the north access road and repairing the culvert crossing; (4) incorporating slope protection measures adjacent to the spillway; (5) rehabilitating the northern reservoir access ramp to safely access the Reservoir bottom; (6) installing a boat dock at the dam face; and (7) performing minor coring on existing dam riser and installing a slide gate to facilitate dewatering.

Los Angeles

Unincorporated

California Air Resources Board (ARB), California Department of Conservation (DOC), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Toxic Substances Control (DTSC), California Department of Water Resources (DWR), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Regional Water Quality Control Board, Los Angeles Region 4 (RWQCB), Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Rights, California Department of Transportation, District 7 (DOT), California Department of Fish and Wildlife, South Coast Region 5 (CDFW)

California Department of Transportation, District 7 (DOT), California Department of Fish and Wildlife, South Coast Region 5 (CDFW)

Other (Sediment Removal)

Sediment Removal

Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Drainage/Absorption, Energy, Flood Plain/Flooding, Geology/Soils, Greenhouse Gas Emissions, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mandatory Findings of Significance, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Solid Waste, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wetland/Riparian, Wildfire