Castaic Dam High Intake Tower Bridge Retrofit Project

Castaic Dam High Intake Tower Bridge Retrofit Project

DWR is proposing to implement the project to seismically retrofit the high intake tower bridge at Castaic Lake, the terminal reservoir of the State Water Project's West Branch, located within the Castaic Lake State Recreation Area. Construction would occur at the tower bridge, tower bridge abutment, Piers 2 through 4, and Abutment 5. The tower bridge retrofit would include installing restrainer cables to transfer longitudinal seismic forces to the adjacent spans or frames and the piers would be jacketed with carbon fiber reinforcement. Carbon fiber reinforcement is an extremely strong and light-weight, carbon fiber-reinforced plastic. Each pier jacket would strengthen the pier structure to meet seismic requirements. Project implementation would require the lake's surface elevation would be lowered from the normal operation elevation of approximately 1,505 feet above mean sea level (amsl) to 1,380 feet amsl to access project components, such as the piers and abutment structures holding the tower bridge above water level. Construction staging areas would only be located in un-vegetated areas near the dam's right abutment. Existing paved and dirt roads would be used for hauling and transporting materials within the project area. Project construction is anticipated to take 15.5 months with the drawdown of Castaic Lake taking approximately 10 months. Construction work hours would generally range between 7:00 a.m. to 7:00 p.m., Monday through Friday.

Castaic

Los Angeles

California Air Resources Board (ARB), California Department of Fish and Wildlife, South Coast Region 5 (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 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), California Santa Monica Mountains Conservancy (SMMC), California State Lands Commission (SLC), Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Quality, State Water Resources Control Board, Division of Water Rights, California Department of Transportation, District 7 (DOT), California Department of Conservation (DOC)

California Department of Transportation, District 7 (DOT), California Department of Conservation (DOC)

Other (High Intake Tower Bridge Retrofit)

Retrofit

Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Drainage/Absorption, Flood Plain/Flooding, Geology/Soils, Growth Inducement, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Solid Waste, Transportation, Tribal Cultural Resources, Vegetation, Wetland/Riparian, Wildfire