Sonoma Hills is a privately owned dam located in Lakeville, California, serving as a crucial water supply infrastructure for irrigation, recreation, and water supply purposes. Completed in 1991, this earth dam stands at a height of 38 feet and has a storage capacity of 240 acre-feet. Situated on the Tr Tolay Creek, the dam plays a vital role in water resource management within Sonoma County, California.

With a low hazard potential and a satisfactory condition assessment, Sonoma Hills has been regulated, permitted, inspected, and enforced by the California Department of Water Resources (DWR) under the Safety of Dams program. The dam is regularly inspected, with the last assessment conducted in September 2019, ensuring its safety and functionality. The surrounding area, covering 29 acres, provides a valuable water source for the community while also offering recreational opportunities for residents and visitors.

As an essential component of the local water infrastructure, Sonoma Hills contributes to the sustainable management of water resources in Sonoma County. With its strategic location and reliable performance, the dam represents a successful collaboration between private ownership and state regulatory agencies in ensuring the safety and efficiency of water supply operations in the region. Climate and water resource enthusiasts can appreciate the role of Sonoma Hills in supporting irrigation, recreation, and water supply needs while maintaining a high standard of safety and environmental stewardship.