Lake Ranch Reservoir Outlet Works Improvements

5 Documents in Project


SCH Number
Lead Agency
Santa Clara County
Document Title
Lake Ranch Reservoir Outlet Works Improvements
Document Type
NOD - Notice of Determination
Present Land Use
Park & Reservoir/Hillside/Hillside/Regional Parks, Existing
Document Description
San Jose Water Co. is proposing rehabilitation of the Lake Ranch Reservoir in accordance with the requirements of the CA Division of Safety Dams. Lake Ranch Reservoir is a small, approx.. 70 million gallon reservoir constructed between 1874 and 1876. SJWC proposes to construct siphons over both dams and grout the existing outlet pipes, rather than replace them. Based on the DSOD's drawdown requirements, the siphon at Saratoga dam will consist of a 12-inch diameter pipe At Beardsley dam, the siphon will consist of 44-inch diameter pipe with 16 inch emergency pipe. The siphons will be constructed using high-density polyethylene (HDPE) piping. The pipes will be buried and concrete-encased where they cross over the dam abutments, and will be mounted on the lake bottom with floating intakes within the reservoir. For the Saratoga dam, the project proposes to demolish and remove the following structures: floating wood and aluminum outlet structure, B-inch floating HDPE pipe, concrete vault, and B-inch above grade steel pipeline. However, the existing mooring piles for the floating outlet structure will be protected and reused as part of the new improvements. In addition, the buried B-inch pipe will be abandoned by pressure grouting pipe. For the Beardsley dam, the project includes demolition/removal of the steel and concrete outlet structure, valve, extension stem, metal supports and handwheel (concrete supports to remain for reuse), 6 inch steel pipeline above grade, 10-inch ductile iron pipeline above grade, and wood discharge structure to Lyndon Canyon (or Beardsley) Creek. In addition, the buried 10-inch pipe and buried 6-inch steel pipe will be abandoned by pressure grouting pipe. A temporary cofferdam will be installed to create a dry work environment for construction work at the Beardsley dam.

Contact Information

Kimberly Brosseau
Agency Name
Santa Clara County
Contact Types
Lead/Public Agency


Santa Clara
Cross Streets
Skyline Blvd./Gist Rd.
Total Acres
Parcel #
State Highways
Lyndon Canyon Creek, unnamed tributary to Sanborn Creek

Notice of Determination

Approving Agency
Santa Clara County Board of Supervisors
Approving Agency Role
Lead Agency
Approved On


(1) The project will have a significant impact on the environment
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
(3) Mitigated measures were made a condition of the approval of the project
(4) A mitigation reporting or monitoring plan was adopted for this project
(5) A Statement of Overriding Considerations was adopted for this project
(6) Findings were made pursuant to the provisions of CEQA

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 or via phone at (916) 445-0613.

Download CSV New Search Print