Vermilion Valley, also known as Edison Lake, is a private hydroelectric facility located in Fresno, California, along the picturesque Mono Creek. Built by Bechtel and completed in 1954, this earth dam stands at 165 feet tall and stretches over 4,200 feet long, with a storage capacity of 140,000 acre-feet. With a normal storage level of 125,035 acre-feet and a maximum discharge capacity of 18,800 cubic feet per second, this dam plays a crucial role in water resource management and power generation in the region.

Managed by the Federal Energy Regulatory Commission, Vermilion Valley's spillway system is of the controlled type, with one Tainter radial gate for water release. The dam's hazard potential is classified as high, with a risk assessment rating of very high. Despite its age, the dam's condition assessment is currently not available, and its Emergency Action Plan (EAP) status is also pending updates. As a key player in California's water infrastructure, Vermilion Valley serves as a vital asset for both water resource and climate enthusiasts interested in the sustainable management of our natural resources.

With its strategic location in the Sacramento District and its crucial role in water storage and power generation, Vermilion Valley stands as a testament to human ingenuity in harnessing the power of nature for the greater good. As a private facility under state regulation, this dam represents the intersection of technology, environmental stewardship, and public safety. For enthusiasts passionate about water resources and climate resilience, Vermilion Valley offers a fascinating case study in the complexities of managing and maintaining vital infrastructure in the face of changing climatic conditions and regulatory challenges.