Winter 2023-2024 Throughout the 2023-2024 rain season our Peninsula reservoirs remained at normal levels. The next scheduled update to this page will be in the Fall of 2024. Please read below how you can monitor reservoir levels and stream flows, as well as how to sign up for alerts from your local jurisdiction. Wet Weather Operations The San Francisco Public Utilities Commission owns and operates the Crystal Springs Reservoir system on the Peninsula, which includes Lower Crystal Springs Dam on San Mateo Creek. This reservoir is a key source of drinking water for the San Francisco Peninsula