Castaic Dam High Intake Tower Bridge Retrofit
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Summary
- SCH Number
- 2020049025
- Lead Agency
- California Department of Water Resources (DWR)
- Document Title
- Castaic Dam High Intake Tower Bridge Retrofit
- Document Type
- NOD - Notice of Determination
- Received
- Posted
- 9/8/2020
- Present Land Use
- 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 includes upgrading the high tower's electrical system, installing restrainer cables to transfer longitudinal seismic forces to the adjacent spans or frames and carbon fiber reinforcement jacketing of the piers. Carbon fiber reinforcementis 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 (ams!) to 1,380 feet ams! 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 ofCastaic 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 M Radieve
Department of Water Resources
Lead/Public Agency
1416 9th Street, Room 452-1
Sacramento, CA 95814
Phone : (916) 651-2458
gina.radieve@water.ca.gov
Location
- Counties
- Los Angeles
- Regions
- Southern California
- Cross Streets
- Ridge Rt. Road and Castaic Lake Drive (Castaic Lake)
Notice of Determination
- Approving Agency
- Department of Water Resources
- Approving Agency Role
- Lead Agency
- Approved On
- Final Environmental Document Available at
- https://water.ca.gov/Programs/State-Water-Project/SWP-Facilities/Southern/Castaic-Dam-Modernization
Determinations
- (1) The project will have a significant impact on the environment
- No
- (2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
- No
- (2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
- Yes
- (2c) An other document type was prepared for this project pursuant to the provisions of CEQA
- No
- (3) Mitigated measures were made a condition of the approval of the project
- Yes
- (4) A mitigation reporting or monitoring plan was adopted for this project
- Yes
- (5) A Statement of Overriding Considerations was adopted for this project
- No
- (6) Findings were made pursuant to the provisions of CEQA
- No
Attachments
- Environmental Document
- Dept of Fish and Wildlife Receipt PDF 27 K
- Notice of Determination
- NOD_9 PDF 742 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 state.clearinghouse@opr.ca.gov or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.