Mammoth Reservoir, located in Loomis, California, is a local government-owned water resource primarily used for hydroelectric power generation and irrigation purposes. Built in 1851, this offstream earth dam stands at a height of 23 feet and has a capacity of 103 acre-feet. With a surface area of 11 acres and a drainage area of 0.02 square miles, the reservoir serves as a crucial water management structure in the region.

Managed by the California Department of Water Resources, Mammoth Reservoir has a high hazard potential but is deemed to be in satisfactory condition following a recent assessment in September 2017. The dam is subject to regular inspections, with the last one conducted in February 2021. Despite its age, Mammoth Reservoir continues to play a vital role in water supply and energy production in the area, showcasing the resilience and importance of historical water infrastructure in the face of changing climate conditions.

As a key component of the local water infrastructure, Mammoth Reservoir reflects the intersection of history, hydroelectric power, and water management in California. With its long-standing presence and continued functionality, the reservoir stands as a testament to the enduring value of water resources in the region. Climate enthusiasts and water resource professionals alike can appreciate the significance of Mammoth Reservoir in sustaining the needs of both the community and the environment in an ever-changing climate landscape.