Lower Twin Lake, located in Mono County, California, is a private water supply dam with a history dating back to its completion in 1888. The dam, primarily serving irrigation and water supply purposes, stands at a height of 16 feet with a hydraulic height of 11.7 feet. It stores a maximum capacity of 4011 acre-feet of water and covers a surface area of 399 acres, drawing from a drainage area of 39.1 square miles.

Managed by the California Department of Water Resources (DWR) and regulated for safety by the Safety of Dams agency, Lower Twin Lake's dam has a high hazard potential but is currently rated in fair condition as of the last assessment in September 2017. The dam's emergency action plan was last revised in August 2019, ensuring preparedness in the event of a crisis. With a recent inspection in October 2020 and a regular inspection frequency of 1 year, the dam remains under careful monitoring to ensure its structural integrity and continued safe operation.

Surrounded by the stunning scenery of Bridgeport and fed by Robinson Creek, Lower Twin Lake stands as a vital resource for water supply and agricultural irrigation in the region. Its historical significance, coupled with its ongoing regulatory oversight and maintenance efforts, highlights the importance of sustainable water management practices in the face of changing climate conditions. Enthusiasts of water resources and climate resilience can appreciate the role that Lower Twin Lake plays in balancing human needs with environmental stewardship in California's diverse landscape.