Castaic Dam High Intake Tower Bridge Retrofit Project


SCH Number
Lead Agency
Water Resources, Department of (California Department of Water Resources)
Document Title
Castaic Dam High Intake Tower Bridge Retrofit Project
Document Type
MND - Mitigated Negative Declaration
Project Applicant
California Department of Water Resources
Present Land Use
Land Use: O-W- Water Body and 0- Open Space. Zoning: O-S Open Space

Document Description
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.

Contact Information
Gina Radieve
Department of Water Resources
1416 9th Street
Sacramento, CA 95814

Phone : (916) 651-2458


Los Angeles

Notice of Completion

Review Period Start
Review Period End
Development Type
Other (High Intake Tower Bridge Retrofit)
Local Action
Project Issues
Aesthetic/Visual Agricultural Land Air Quality Archaeologic-Historic Biological Resources Drainage/Absorption Flood Plain/Flooding Forest Land/Fire Hazard Geologic/Seismic Minerals Noise Population/Housing Balance Public Services Recreation/Parks Soil Erosion/Compaction/Grading Solid Waste Toxic/Hazardous Traffic/Circulation Tribal Cultural Resources Vegetation Water Quality Water Supply Wetland/Riparian Growth Inducing Land Use Cumulative Effects
Reviewing Agencies
California Air Resources Board California Department of Conservation California Department of Fish and Wildlife, South Coast Region 5 California Department of Forestry and Fire Protection California Department of Parks and Recreation California Department of State Parks, Division of Boating and Waterways California Department of Water Resources California Highway Patrol California Native American Heritage Commission California Natural Resources Agency California Regional Water Quality Control Board, Los Angeles Region 4 California Santa Monica Mountains Conservancy California State Lands Commission 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


Environmental Document
00_FINAL ADA 508_IS-MND   PDF 27365 K NOI   PDF 1181 K
NOC   PDF 1328 K
State Comments
2020049025_Caltrans Comment   PDF 240 K

Disclaimer: The Governor’s Office of Planning and Research (OPR) accepts no responsibility for the content or accessibility of these documents. To obtain an attachment in a different format, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

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