Jamieson Vineyards, located in Napa Junction, California, is a privately owned water supply dam situated along Tr Fagan Creek. The dam, classified as an Earth type, stands at a height of 41 feet and has a storage capacity of 75 acre-feet. With a drainage area of 0.78 square miles and a surface area of 6.2 acres, the dam serves multiple purposes including irrigation, recreation, and water supply for the surrounding area.

Managed by the California Department of Water Resources and regulated by the Safety of Dams division, Jamieson Vineyards Dam has a significant hazard potential but is currently assessed as being in satisfactory condition. The dam underwent its last inspection in October 2020, with inspections occurring at a frequency of once per year. The emergency action plan status and risk assessment details for the dam are not available, but it is reassuring to note that the dam meets state permitting, inspection, and enforcement requirements, ensuring its continued safe operation for the community and environment it serves as a vital water resource infrastructure.