Big Lagoon, located in Humboldt County, California, is a privately owned earth dam completed in 1947 for water supply purposes. The dam stands at 16 feet high with a hydraulic height of 12 feet, creating a storage capacity of 780 acre-feet. With a surface area of 78 acres and a drainage area of 1.45 square miles, Big Lagoon serves as a vital resource for the surrounding area.

Managed by the California Department of Water Resources and regulated by the Safety of Dams program, Big Lagoon has a low hazard potential and is in satisfactory condition as of the last assessment in September 2017. Despite its age, the dam has shown resilience and continues to provide essential water supply services to the region. With its serene surroundings and important role in water resource management, Big Lagoon is a site of interest for water resource and climate enthusiasts alike.

With Congressman Jared Huffman representing the district, Big Lagoon's significance extends beyond its structural attributes. The dam plays a crucial role in mitigating water scarcity in the area and contributes to the overall environmental resilience of the region. As climate change impacts water resources, the sustainable management of structures like Big Lagoon becomes increasingly important, making it a focal point for those interested in the intersection of water management and climate adaptation.