Lenihan Dam Outlet Modifications Project

7 Documents in Project


SCH Number
Lead Agency
Santa Clara Valley Water District
Document Title
Lenihan Dam Outlet Modifications Project
Document Type
EIR - Draft EIR
Present Land Use
Lenihan Dam and Lexington Reservoir are used primarily for water storage. Existing zoning is "Hillside (HS d1sr)."

Document Description
Since the late 1980's, sections of the Lenihan Dam Outlet outlet pipeline have experienced buckling. Due to these conditions, the Divisions of Safety of Dams (DSOD) has imposed an operation restriction limiting discharges through the outlet pipe to 70 cubic feet per second (cfs) reducing optional flexibility. The project is intended to provide a fully functional outlet works through the construction of the following elements: 1) a tunnel through the hillside to the south of Lenihan Dam to carry a new outlet pipe; 2) a multi-port inclined intake structure in Lexington Reservoir adjacent to the dam; 3) an energy dissipation structure in Los Gatos Creek at the new pipeline discharge; and 5) new control buildings for operation of the control valve located near the adjacent Santa Clara County Department of Parks and Recreation parking lot and the proposed outlet energy dissipation structure. Construction period would be about 18 months, using several staging areas including an existing paved lot that provides parking for public recreational uses. Reservoir levels will be lowered for one year and a coffer dam will be installed to allow for construction of the new intake structure.

Contact Information
Tiffany Hernandez
Santa Clara Valley Water District
5750 Almaden Expressway
San Jose, CA 95118-3686

Phone : 408-265-2607 ext 3094


Los Gatos
Santa Clara
Cross Streets
Alma Bridge Road
Total Acres
Parcel #
State Highways
Los Gatos Creek

Notice of Completion

Review Period Start
Review Period End
Development Type
Water Facilities (dam Type) Other (tunnel)
Local Action
Other Action Other Action: Dam Outlet
Project Issues
Aesthetic/Visual Air Quality Archaeologic-Historic Flood Plain/Flooding Geologic/Seismic Noise Public Services Recreation/Parks Soil Erosion/Compaction/Grading Toxic/Hazardous Traffic/Circulation Vegetation Water Quality Water Supply Wetland/Riparian Wildlife Land Use Other Other Issues: Fisheries
Reviewing Agencies
California Department of Parks and Recreation California Energy Commission California Highway Patrol California Native American Heritage Commission Office of Historic Preservation Regional Water Quality Control Board, Region 2 Resources Agency State Water Resources Control Board, Division of Water Rights Department of Water Resources California Department of Transportation, District 4 California Department of Fish and Wildlife, Region 3

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, 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.

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