South Mountain is a federally owned Earth dam located in Modoc, California, constructed in 1980 for purposes of fire protection, stock, and small fish pond management. The dam stands at a height of 10 feet with a hydraulic height of 8 feet, and a length of 1235 feet. It has a storage capacity of 566 acre-feet and a drainage area of 4.7 square miles.

This dam, managed by the Forest Service, has a controlled spillway with a width of 30 feet and outlet gates consisting of a slide (sluice gate). Despite being rated as having a low hazard potential, the risk assessment for South Mountain indicates a very high risk level (1). The last inspection was conducted in August 2010, with an inspection frequency of every 10 years. The dam is essential for water resource management in the area and plays a crucial role in mitigating the impacts of climate change on the local ecosystem.

With its strategic location and purposeful design, South Mountain serves as a vital infrastructure for water storage and regulation in the region. As climate change continues to affect water resources, the maintenance and monitoring of dams like South Mountain are crucial for ensuring the resilience of the surrounding environment. The Forest Service's ongoing management of the dam highlights the importance of proactive measures in adapting to changing climate conditions and protecting water resources for future generations.