Lake Mary, located in Mono County, California, is a Federal-owned water supply reservoir managed by the Forest Service. Built in 1934, this Earth dam stands at a height of 10 feet and has a storage capacity of 1300 acre-feet. The primary purpose of Lake Mary is to provide water supply, with additional benefits including flood risk reduction and recreation opportunities.

Despite its relatively small size, Lake Mary plays a critical role in the region's water resource management and is classified as having a high hazard potential. With a drainage area of 7.73 square miles, the reservoir serves as a vital source of water for surrounding communities. The dam features a controlled spillway and flap outlet gates, with periodic inspections and maintenance to ensure its structural integrity.

Although the condition assessment is currently listed as "Not Rated," the risk assessment for Lake Mary is categorized as very high. The reservoir's risk management measures and emergency action plan status are not specified, suggesting potential areas for improvement in ensuring the safety and reliability of this essential water supply infrastructure. As climate change continues to impact water resources, the conservation and proper maintenance of Lake Mary are crucial for meeting the region's growing water demands and adapting to changing environmental conditions.