Vineyard Subdivision, also known as Vineyard Lake, is a private water supply dam located in Geyserville, California. Built in 1962, this earth dam stands at 26 feet high and has a storage capacity of 245 acre-feet. The dam's primary purpose is to provide water for the surrounding area, with secondary purposes including recreation. It is regulated and permitted by the California Department of Water Resources and is subject to regular inspections to ensure its safety and proper functioning.

Situated on Tr Gill Creek in Sonoma County, Vineyard Subdivision plays a crucial role in water management and supply in the region. The dam has a significant hazard potential but has been assessed as satisfactory in condition as of September 2017. The inspection frequency is set at once per year, with the last inspection conducted in January 2020. Despite its age, the dam continues to serve its intended purposes effectively, highlighting the importance of proper maintenance and regulation in ensuring the safety and reliability of water resources in the area.

With its strategic location and vital role in water supply, Vineyard Subdivision serves as a key asset for the community of Geyserville and surrounding areas. Its satisfactory condition and adherence to regulatory standards demonstrate a commitment to water resource management and the safety of dams. As water resource and climate enthusiasts, understanding the infrastructure and maintenance of dams like Vineyard Subdivision is essential for ensuring the sustainable and efficient utilization of water for both human consumption and recreational activities in the region.