Lost Lake West, located in Alpine County, California, is a key water resource infrastructure managed by a public utility agency. Built in 1925, this earth dam stands at 21 feet tall and serves primarily for irrigation and water supply purposes, with a storage capacity of 140 acre-feet. The dam overlooks Lost Creek and has a low hazard potential, deemed satisfactory in condition as of the last assessment in 2017.

Managed by the Department of Water Resources and regulated by the Safety of Dams agency, Lost Lake West plays a crucial role in water management in the region. With its strategic location in Mesa Vista and proximity to the Lost Creek, this dam ensures the steady supply of water for agricultural and municipal needs. Despite its age, the structure appears to be well-maintained and regularly inspected, meeting state permitting and enforcement requirements.

For water resource and climate enthusiasts, Lost Lake West offers a glimpse into the intricate network of dams that support California's water infrastructure. Its historical significance, combined with its functional role in water supply, makes it a notable site for understanding the intersection of water management, engineering, and environmental stewardship in the face of changing climate conditions. As a vital piece of the puzzle in ensuring water security for the region, Lost Lake West stands as a testament to the ongoing efforts to manage and adapt to the challenges posed by a changing climate.