Donovan, also known as Donovan Reservoir, is a private water supply reservoir located in Modoc County, California. The dam was completed in 1953 and stands at a height of 28 feet, with a maximum storage capacity of 1234 acre-feet. The reservoir serves the primary purpose of irrigation and water supply, benefiting the surrounding agricultural community in the Pit River area.

Managed by the Natural Resources Conservation Service, Donovan Reservoir is regulated by the California Department of Water Resources for safety and inspection. The dam has a significant hazard potential but is currently in satisfactory condition, as assessed in September 2017. With a drainage area of 35.2 square miles and a surface area of 207 acres, the reservoir plays a crucial role in water management in the region, supporting the needs of both human and environmental systems.

The location of Donovan Reservoir along Rye Grass Swale offers a vital source of water for the local ecosystem, while also serving as a key infrastructure for irrigation purposes. With its strategic position and historical significance dating back to the mid-20th century, Donovan Reservoir continues to play a crucial role in water resource management and climate resilience efforts in the region.