Reservoir M, located in Modoc, California, is a federal-owned earth dam completed in 1977 primarily used for irrigation purposes. With a height of 13 feet and a storage capacity of 2840 acre-feet, it plays a crucial role in providing water for agricultural needs in the region. The dam's controlled spillway with a width of 80 feet allows for the safe release of excess water during heavy rainfall events, ensuring the safety of downstream areas.

Managed by the Forest Service, Reservoir M has a low hazard potential and a very high risk assessment rating, indicating the importance of regular inspections and maintenance. The dam's slide gate outlet system and the lack of a current condition assessment highlight the need for ongoing monitoring to ensure its structural integrity. Despite not being state-regulated, the reservoir serves as a vital resource for fire protection, livestock, and small fish pond purposes in addition to irrigation, making it a key asset for water resource management in the area.

Overall, Reservoir M stands as a critical infrastructure piece in the water supply network of California, contributing to the agricultural sustainability and water security of the region. As climate change continues to impact water resources, the maintenance and monitoring of this dam are essential to ensure its continued functionality and safety for both human and environmental needs. With its strategic location and purposeful design, Reservoir M serves as a testament to the intersection of water resource management and climate resilience in the face of changing environmental conditions.