The original project is limited to the restoration of Spring Valley Lake and the diversion of water from Wolf Creek and North Fork Cache Creek for storage in Spring Valley Lake. Water diverted into Spring Valley Lake consists of approximately one cubic foot per second (cfs) from Wolf Creek between October 1 and July 1, and up to 300-acre
feet per year of water from North Fork Cache Creek, which is allocated from the Yolo County Flood Control and Conservation District. During the year the Permittee will bypass a minimum of 10 cfs or the total streamflow shall be bypassed, whichever is less. The restoration project is to reclaim the water volume and area of the original reservoir and dam capacity of 320 acre-feet, the current volume is approximately 43 acre-feet. The reclaimed lake is anticipated to provide water for wildfire suppression as well as backup domestic water supply in the event of a prolonged drought.
The proposed project is to be completed in three phases: Phase I will involve construction of a sedimentation pond and filtration marshes, re-direction of Wolf Creek to the southern bank of the reservoir to the spillway of the dam. Phases II & Ill will remove 10-30 feet of sediment from the area delineated on the attached maps. The project is anticipated to remove approx. 352,000 cubic yards of sediment, about half of which is silt. The silt will be deposited as spoils in several County-owned sites within the Spring Valley Lakes Subdivision. The extension will extend the expiration of the Streambed Alteration Agreement until April 26, 2026