Big Creek Dam No. 3a, also known as Huntington Lake No. 3a, is a privately owned concrete dam located in Fresno, California. Completed in 1917, this multi-arch dam stands at a height of 29 feet and has a storage capacity of 89,800 acre-feet, making it a crucial hydroelectric facility on Big Creek. With a primary purpose of hydroelectric power generation, the dam also serves recreational purposes, offering a surface area of 1,435 acres for outdoor activities.

Managed by the Federal Energy Regulatory Commission, Big Creek Dam No. 3a is subject to state regulations and inspections by the California Department of Water Resources. Despite its low hazard potential, the dam is classified as high risk due to its age and the potential implications of its failure. Emergency action plans are in place, with the most recent update in December 2020, to ensure preparedness in case of any unforeseen events. The dam's association with other structures, such as CA00434S001 and CA00434S002, highlights its interconnectedness within the water resource management system.

Overall, Big Creek Dam No. 3a stands as a historic landmark in California's water infrastructure, contributing not only to hydroelectric power generation but also to recreational opportunities in the region. With ongoing inspections and risk assessments, the dam's safety and integrity are closely monitored to prevent any potential risks to the surrounding community and environment. As a key player in the state's water resource management, this concrete marvel continues to play a vital role in shaping California's sustainable future amidst the challenges of climate change.