Horse Lake in Lassen County, California, is a privately-owned dam built in 1912 primarily for water supply purposes. The dam stands at 12 feet high with a hydraulic height of 6.5 feet and a length of 1200 feet, providing a storage capacity of 75 acre-feet. Located in Snowstorm Ranch near Snowstorm Creek, Horse Lake serves as a crucial water source for the surrounding area, covering a surface area of 34 acres and draining a 16.65 square mile watershed.

Although the dam has a low hazard potential and is deemed to be in satisfactory condition as of the last assessment in September 2017, regular inspections by the Department of Water Resources and Safety of Dams ensure its safety and compliance with regulatory standards. Despite its modest size, Horse Lake offers recreational opportunities alongside its water supply function, attracting enthusiasts interested in the intersection of water resources and climate management. With a history dating back over a century, Horse Lake remains a significant structure in the region, contributing to the sustainability and resilience of the local water infrastructure.

Managed by private owners, Horse Lake exemplifies the importance of small-scale dams in supporting water supply needs in California. With its connections to Snowstorm Creek and the San Francisco District of the US Army Corps of Engineers, Horse Lake showcases the intricate network of water management systems in the state. As climate change impacts water resources, the upkeep and regulation of structures like Horse Lake become increasingly vital in ensuring water security and environmental stewardship for future generations.