Jayne's Lake, located in Mendocino County, California, is a private dam that was completed in 1985 for flood risk reduction along Toney Creek. Standing at a height of 70 feet with a storage capacity of 1225 acre-feet, this earth dam plays a crucial role in irrigation and water supply for the surrounding area. Despite being regulated by the state and subject to regular inspections, Jayne's Lake is classified as having a low hazard potential and is in satisfactory condition as of the last assessment in September 2017.

Owned by a private entity, Jayne's Lake serves as a vital infrastructure for managing water resources in the region, with its primary purpose being flood risk reduction. The dam spans a length of 650 feet and covers a surface area of 55 acres while also providing essential irrigation and water supply functions. Situated in the city of Hearst, this dam is under the jurisdiction of the California Department of Water Resources and is inspected regularly to ensure its safety and compliance with state regulations.

Managed by the Sacramento District of the US Army Corps of Engineers, Jayne's Lake has not undergone significant modifications since its completion. With a designated emergency action plan yet to be prepared, the dam is deemed to have satisfactory risk management measures in place. As a key component in the water infrastructure of Mendocino County, Jayne's Lake stands as a testament to the importance of sustainable water resource management in the face of climate variability and changing environmental conditions.