Briones Reservoir Contra Costa County, CA Follow1 Share Share Briones Reservoir... Email Facebook Twitter Briones ReservoirFollow Overview Fishing Reports Guides & Tackle California Briones Reservoir Nearby Businesses Guides & Tackle Shops near Briones Reservoir Checkout local fishing businesses near Briones Reservoir. Add your business. Currently, no businesses are listed for Briones Reservoir. Be the first to add yours! Feature your Briones Reservoir Business here! Learn more