Sea Ranch is a private water supply dam located in Sonoma, California, specifically in the city of Sea Ranch. Completed in 1996, this offstream dam stands at a height of 61 feet with a hydraulic height of 57 feet. It has a storage capacity of 300 acre-feet and covers a surface area of 14 acres, serving its primary purpose of water supply for the region.

Managed by the California Department of Water Resources, Sea Ranch is regulated, permitted, inspected, and enforced to ensure its safety and compliance with state regulations. Despite its low hazard potential, the dam is assessed to be in satisfactory condition as of September 2017. With the oversight of state agencies and regular inspections, Sea Ranch continues to provide reliable water storage for the surrounding area while mitigating potential risks associated with its operation. Water resource and climate enthusiasts can appreciate Sea Ranch as a vital infrastructure contributing to the sustainable management of water resources in California.