Located in Brentwood, California, Los Vaqueros is a key water supply reservoir in Contra Costa County. Completed in 1997, this earth dam stands at 231 feet tall with a storage capacity of 160,000 acre-feet, serving as a vital resource for the region. The reservoir's primary purpose is water supply, with the surrounding area covering 1836 acres and draining a 18.75 square mile watershed that includes the Kellogg Creek.

Managed by a public utility and regulated by the California Department of Water Resources for dam safety, Los Vaqueros has a high hazard potential but is currently deemed to be in satisfactory condition following a 2017 assessment. The dam's emergency action plan was last revised in December 2020, ensuring preparedness for any potential risks. With its strategic location and critical role in supplying water to the region, Los Vaqueros serves as a symbol of sustainable water management in the face of climate challenges, making it a must-visit destination for water resource and climate enthusiasts.