Alpine Main, also known as Alpine No. 1, is a privately owned dam located in the picturesque county of Alpine, California. Built in 1891, this rockfill dam stands at a height of 49 feet and serves multiple purposes including hydroelectric power generation, recreation, and water supply. With a storage capacity of 4,300 acre-feet and a drainage area of 5.3 square miles, the dam plays a crucial role in managing water resources in the region.

Managed by the Federal Energy Regulatory Commission (FERC) and regulated by the California Department of Water Resources (DWR), Alpine Main has a high hazard potential and a moderate risk assessment rating. The dam's primary function is to harness the power of Silver Creek for hydroelectricity, while also providing opportunities for recreational activities and supplying water to the surrounding areas. With a structural height of 81.3 feet and a hydraulic height of 78.3 feet, Alpine Main is a key component of the region's water infrastructure.

Despite its age, Alpine Main has undergone regular inspections and is equipped with emergency action plans to ensure the safety of downstream communities in case of a dam failure. With its historical significance and ongoing role in water management, Alpine Main stands as a testament to the enduring importance of dams in balancing the needs of water resource management and climate adaptation in California's diverse landscapes.