Castaic Dam High Intake Tower Bridge Retrofit

4 Documents in Project

Summary

SCH Number
2020049025
Lead Agency
Water Resources, Department of (California Department of Water Resources)
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
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.

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