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Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at https://water.weather.gov will be replaced by the National Water Prediction Service (NWPS), with a target of Spring 2024. Existing AHPS content and features will be preserved and expanded within NWPS. The NWS is now accepting feedback on NWPS. Please visit https://www.weather.gov/owp/operations for more information.

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Hydrograph River at a Glance Download
San Lorenzo River (CA) at Big Trees Stage (ft)Flow (kcfs)Observed: 3.38 ft at 9:00PM Nov 29, 2023Observed: 3.38 ft at 9:15PM Nov 29, 2023Observed: 3.38 ft at 9:30PM Nov 29, 2023Observed: 3.38 ft at 9:45PM Nov 29, 2023Highest Observation: 3.39 ft at 10:00PM Nov 29, 2023Observed: 3.38 ft at 10:15PM Nov 29, 2023Observed: 3.38 ft at 10:30PM Nov 29, 2023Observed: 3.38 ft at 10:45PM Nov 29, 2023Observed: 3.38 ft at 11:00PM Nov 29, 2023Observed: 3.38 ft at 11:15PM Nov 29, 2023Highest Observation: 3.39 ft at 11:30PM Nov 29, 2023Highest Observation: 3.39 ft at 11:45PM Nov 29, 2023Observed: 3.38 ft at 12:00AM Nov 30, 2023Highest Observation: 3.39 ft at 12:15AM Nov 30, 2023Observed: 3.38 ft at 12:30AM Nov 30, 2023Highest Observation: 3.39 ft at 12:45AM Nov 30, 2023Highest Observation: 3.39 ft at 1:00AM Nov 30, 2023Observed: 3.38 ft at 1:15AM Nov 30, 2023Highest Observation: 3.39 ft at 1:30AM Nov 30, 2023Highest Observation: 3.39 ft at 1:45AM Nov 30, 2023Observed: 3.38 ft at 2:00AM Nov 30, 2023Highest Observation: 3.39 ft at 2:15AM Nov 30, 2023Highest Observation: 3.39 ft at 2:30AM Nov 30, 2023Observed: 3.38 ft at 2:45AM Nov 30, 2023Observed: 3.38 ft at 3:00AM Nov 30, 2023Observed: 3.38 ft at 3:15AM Nov 30, 2023Observed: 3.38 ft at 3:30AM Nov 30, 2023Observed: 3.38 ft at 3:45AM Nov 30, 2023Observed: 3.38 ft at 4:15AM Nov 30, 2023Observed: 3.38 ft at 4:30AM Nov 30, 2023Observed: 3.38 ft at 4:45AM Nov 30, 2023Observed: 3.38 ft at 5:00AM Nov 30, 2023Observed: 3.38 ft at 5:15AM Nov 30, 2023Observed: 3.38 ft at 5:30AM Nov 30, 2023Observed: 3.38 ft at 5:45AM Nov 30, 2023Observed: 3.38 ft at 6:00AM Nov 30, 2023Observed: 3.38 ft at 6:15AM Nov 30, 2023Observed: 3.38 ft at 6:30AM Nov 30, 2023Observed: 3.38 ft at 6:45AM Nov 30, 2023Observed: 3.38 ft at 7:00AM Nov 30, 2023Observed: 3.38 ft at 7:15AM Nov 30, 2023Observed: 3.38 ft at 7:30AM Nov 30, 2023Observed: 3.38 ft at 7:45AM Nov 30, 2023Observed: 3.38 ft at 8:00AM Nov 30, 2023Observed: 3.38 ft at 8:15AM Nov 30, 2023Observed: 3.38 ft at 8:30AM Nov 30, 2023Observed: 3.38 ft at 8:45AM Nov 30, 2023Observed: 3.38 ft at 9:00AM Nov 30, 2023Observed: 3.38 ft at 9:15AM Nov 30, 2023Observed: 3.38 ft at 9:30AM Nov 30, 2023Observed: 3.38 ft at 9:45AM Nov 30, 2023Observed: 3.38 ft at 10:00AM Nov 30, 2023Observed: 3.38 ft at 10:15AM Nov 30, 2023Observed: 3.38 ft at 10:30AM Nov 30, 2023Observed: 3.38 ft at 10:45AM Nov 30, 2023Observed: 3.38 ft at 11:00AM Nov 30, 2023Observed: 3.38 ft at 11:15AM Nov 30, 2023Observed: 3.38 ft at 11:30AM Nov 30, 2023Observed: 3.38 ft at 11:45AM Nov 30, 2023Observed: 3.38 ft at 12:00PM Nov 30, 2023Observed: 3.38 ft at 12:15PM Nov 30, 2023Observed: 3.38 ft at 12:30PM Nov 30, 2023Observed: 3.38 ft at 12:45PM Nov 30, 2023Observed: 3.38 ft at 1:00PM Nov 30, 2023Observed: 3.38 ft at 1:15PM Nov 30, 2023Observed: 3.38 ft at 1:30PM Nov 30, 2023Observed: 3.38 ft at 1:45PM Nov 30, 2023Observed: 3.38 ft at 2:00PM Nov 30, 2023Observed: 3.38 ft at 2:15PM Nov 30, 2023Observed: 3.38 ft at 2:30PM Nov 30, 2023Observed: 3.38 ft at 2:45PM Nov 30, 2023Observed: 3.38 ft at 3:00PM Nov 30, 2023Observed: 3.36 ft at 3:15PM Nov 30, 2023Observed: 3.38 ft at 3:30PM Nov 30, 2023Observed: 3.38 ft at 3:45PM Nov 30, 2023Observed: 3.38 ft at 4:00PM Nov 30, 2023Observed: 3.38 ft at 4:15PM Nov 30, 2023Observed: 3.38 ft at 4:30PM Nov 30, 2023Observed: 3.38 ft at 4:45PM Nov 30, 2023Observed: 3.38 ft at 5:00PM Nov 30, 2023Observed: 3.38 ft at 5:15PM Nov 30, 2023Observed: 3.37 ft at 5:30PM Nov 30, 2023Observed: 3.37 ft at 5:45PM Nov 30, 2023Observed: 3.37 ft at 6:00PM Nov 30, 2023Observed: 3.37 ft at 6:15PM Nov 30, 2023Observed: 3.37 ft at 6:30PM Nov 30, 2023Observed: 3.37 ft at 6:45PM Nov 30, 2023Observed: 3.37 ft at 7:00PM Nov 30, 2023Observed: 3.37 ft at 7:15PM Nov 30, 2023Observed: 3.37 ft at 7:30PM Nov 30, 2023Observed: 3.37 ft at 7:45PM Nov 30, 2023Observed: 3.37 ft at 8:00PM Nov 30, 2023Observed: 3.37 ft at 8:15PM Nov 30, 2023Observed: 3.37 ft at 8:30PM Nov 30, 2023Observed: 3.37 ft at 8:45PM Nov 30, 2023Observed: 3.37 ft at 9:00PM Nov 30, 2023Observed: 3.37 ft at 9:15PM Nov 30, 2023Observed: 3.37 ft at 9:30PM Nov 30, 2023Observed: 3.37 ft at 9:45PM Nov 30, 2023Observed: 3.37 ft at 10:00PM Nov 30, 2023Observed: 3.37 ft at 10:15PM Nov 30, 2023Observed: 3.37 ft at 10:30PM Nov 30, 2023Observed: 3.37 ft at 10:45PM Nov 30, 2023Observed: 3.37 ft at 11:00PM Nov 30, 2023Observed: 3.37 ft at 11:15PM Nov 30, 2023Observed: 3.37 ft at 11:30PM Nov 30, 2023Observed: 3.37 ft at 11:45PM Nov 30, 2023Observed: 3.37 ft at 12:00AM Dec 01, 2023Observed: 3.37 ft at 12:15AM Dec 01, 2023Observed: 3.37 ft at 12:30AM Dec 01, 2023Observed: 3.37 ft at 12:45AM Dec 01, 2023Observed: 3.37 ft at 1:00AM Dec 01, 2023Observed: 3.37 ft at 1:15AM Dec 01, 2023Observed: 3.37 ft at 1:30AM Dec 01, 2023Observed: 3.37 ft at 1:45AM Dec 01, 2023Observed: 3.37 ft at 2:00AM Dec 01, 2023Observed: 3.37 ft at 2:15AM Dec 01, 2023Observed: 3.37 ft at 2:30AM Dec 01, 2023Observed: 3.37 ft at 2:45AM Dec 01, 2023Observed: 3.37 ft at 3:00AM Dec 01, 2023Observed: 3.37 ft at 3:15AM Dec 01, 2023Observed: 3.37 ft at 3:30AM Dec 01, 2023Observed: 3.37 ft at 3:45AM Dec 01, 2023Observed: 3.37 ft at 4:00AM Dec 01, 2023Observed: 3.37 ft at 4:15AM Dec 01, 2023Observed: 3.37 ft at 4:30AM Dec 01, 2023Observed: 3.37 ft at 4:45AM Dec 01, 2023Observed: 3.37 ft at 5:00AM Dec 01, 2023Observed: 3.37 ft at 5:15AM Dec 01, 2023Observed: 3.37 ft at 5:30AM Dec 01, 2023Observed: 3.37 ft at 5:45AM Dec 01, 2023Observed: 3.37 ft at 6:00AM Dec 01, 2023Observed: 3.37 ft at 6:15AM Dec 01, 2023Observed: 3.37 ft at 6:30AM Dec 01, 2023Observed: 3.37 ft at 6:45AM Dec 01, 2023Observed: 3.37 ft at 7:00AM Dec 01, 2023Observed: 3.37 ft at 7:15AM Dec 01, 2023Observed: 3.37 ft at 7:30AM Dec 01, 2023Observed: 3.37 ft at 7:45AM Dec 01, 2023Observed: 3.37 ft at 8:00AM Dec 01, 2023Observed: 3.37 ft at 8:15AM Dec 01, 2023Observed: 3.37 ft at 8:30AM Dec 01, 2023Observed: 3.37 ft at 8:45AM Dec 01, 2023Observed: 3.37 ft at 9:00AM Dec 01, 2023Observed: 3.37 ft at 9:15AM Dec 01, 2023Observed: 3.37 ft at 9:30AM Dec 01, 2023Observed: 3.37 ft at 9:45AM Dec 01, 2023Observed: 3.37 ft at 10:00AM Dec 01, 2023Observed: 3.37 ft at 10:15AM Dec 01, 2023Observed: 3.37 ft at 10:30AM Dec 01, 2023Observed: 3.37 ft at 10:45AM Dec 01, 2023Observed: 3.37 ft at 11:00AM Dec 01, 2023Observed: 3.37 ft at 11:15AM Dec 01, 2023Observed: 3.37 ft at 11:30AM Dec 01, 2023Observed: 3.37 ft at 11:45AM Dec 01, 2023Observed: 3.37 ft at 12:00PM Dec 01, 2023Observed: 3.37 ft at 12:15PM Dec 01, 2023Observed: 3.37 ft at 12:30PM Dec 01, 2023Observed: 3.37 ft at 12:45PM Dec 01, 2023Observed: 3.37 ft at 1:00PM Dec 01, 2023Observed: 3.37 ft at 1:15PM Dec 01, 2023Observed: 3.37 ft at 1:30PM Dec 01, 2023Observed: 3.37 ft at 1:45PM Dec 01, 2023Observed: 3.36 ft at 2:00PM Dec 01, 2023Observed: 3.37 ft at 2:15PM Dec 01, 2023Observed: 3.37 ft at 2:30PM Dec 01, 2023Observed: 3.37 ft at 2:45PM Dec 01, 2023Observed: 3.37 ft at 3:00PM Dec 01, 2023Observed: 3.37 ft at 3:15PM Dec 01, 2023Observed: 3.37 ft at 3:30PM Dec 01, 2023Observed: 3.37 ft at 3:45PM Dec 01, 2023Observed: 3.37 ft at 4:00PM Dec 01, 2023Observed: 3.37 ft at 4:15PM Dec 01, 2023Observed: 3.37 ft at 4:30PM Dec 01, 2023Observed: 3.37 ft at 4:45PM Dec 01, 2023Observed: 3.37 ft at 5:00PM Dec 01, 2023Observed: 3.36 ft at 5:15PM Dec 01, 2023Observed: 3.36 ft at 5:30PM Dec 01, 2023Observed: 3.36 ft at 5:45PM Dec 01, 2023Observed: 3.36 ft at 6:00PM Dec 01, 2023Observed: 3.36 ft at 6:15PM Dec 01, 2023Observed: 3.36 ft at 6:30PM Dec 01, 2023Observed: 3.36 ft at 6:45PM Dec 01, 2023Observed: 3.36 ft at 7:00PM Dec 01, 2023Observed: 3.36 ft at 7:15PM Dec 01, 2023Observed: 3.36 ft at 7:30PM Dec 01, 2023Observed: 3.36 ft at 7:45PM Dec 01, 2023Observed: 3.36 ft at 8:00PM Dec 01, 2023Observed: 3.36 ft at 8:15PM Dec 01, 2023Observed: 3.36 ft at 8:30PM Dec 01, 2023Observed: 3.36 ft at 8:45PM Dec 01, 2023Observed: 3.36 ft at 9:00PM Dec 01, 2023Observed: 3.36 ft at 9:15PM Dec 01, 2023Observed: 3.36 ft at 9:30PM Dec 01, 2023Observed: 3.36 ft at 9:45PM Dec 01, 2023Observed: 3.36 ft at 10:00PM Dec 01, 2023Observed: 3.36 ft at 10:15PM Dec 01, 2023Observed: 3.36 ft at 10:30PM Dec 01, 2023Observed: 3.36 ft at 10:45PM Dec 01, 2023Observed: 3.36 ft at 11:00PM Dec 01, 2023Observed: 3.36 ft at 11:15PM Dec 01, 2023Observed: 3.36 ft at 11:30PM Dec 01, 2023Observed: 3.36 ft at 11:45PM Dec 01, 2023Observed: 3.36 ft at 12:00AM Dec 02, 2023Observed: 3.36 ft at 12:15AM Dec 02, 2023Observed: 3.36 ft at 12:30AM Dec 02, 2023Observed: 3.36 ft at 12:45AM Dec 02, 2023Observed: 3.36 ft at 1:00AM Dec 02, 2023Observed: 3.36 ft at 1:15AM Dec 02, 2023Observed: 3.36 ft at 1:30AM Dec 02, 2023Observed: 3.36 ft at 1:45AM Dec 02, 2023Observed: 3.36 ft at 2:00AM Dec 02, 2023Observed: 3.36 ft at 2:15AM Dec 02, 2023Observed: 3.36 ft at 2:30AM Dec 02, 2023Observed: 3.36 ft at 2:45AM Dec 02, 2023Observed: 3.36 ft at 3:00AM Dec 02, 2023Observed: 3.36 ft at 3:15AM Dec 02, 2023Observed: 3.36 ft at 3:30AM Dec 02, 2023Observed: 3.36 ft at 3:45AM Dec 02, 2023Observed: 3.36 ft at 4:00AM Dec 02, 2023Observed: 3.36 ft at 4:15AM Dec 02, 2023Observed: 3.36 ft at 4:45AM Dec 02, 2023Observed: 3.36 ft at 5:00AM Dec 02, 2023Observed: 3.36 ft at 5:15AM Dec 02, 2023Observed: 3.36 ft at 5:30AM Dec 02, 2023Observed: 3.36 ft at 5:45AM Dec 02, 2023Observed: 3.36 ft at 6:00AM Dec 02, 2023Observed: 3.36 ft at 6:15AM Dec 02, 2023Observed: 3.36 ft at 6:30AM Dec 02, 2023Observed: 3.36 ft at 6:45AM Dec 02, 2023Observed: 3.36 ft at 7:00AM Dec 02, 2023Observed: 3.36 ft at 7:15AM Dec 02, 2023Observed: 3.36 ft at 7:30AM Dec 02, 2023Observed: 3.36 ft at 7:45AM Dec 02, 2023Observed: 3.36 ft at 8:00AM Dec 02, 2023Observed: 3.36 ft at 8:15AM Dec 02, 2023Observed: 3.36 ft at 8:30AM Dec 02, 2023Observed: 3.36 ft at 8:45AM Dec 02, 2023Observed: 3.37 ft at 9:00AM Dec 02, 2023Observed: 3.36 ft at 9:15AM Dec 02, 2023Observed: 3.36 ft at 9:30AM Dec 02, 2023Observed: 3.37 ft at 9:45AM Dec 02, 2023Observed: 3.37 ft at 10:00AM Dec 02, 2023Observed: 3.37 ft at 10:15AM Dec 02, 2023Observed: 3.37 ft at 10:30AM Dec 02, 2023Observed: 3.37 ft at 10:45AM Dec 02, 2023Observed: 3.37 ft at 11:00AM Dec 02, 2023Observed: 3.37 ft at 11:15AM Dec 02, 2023Observed: 3.37 ft at 11:30AM Dec 02, 2023Observed: 3.37 ft at 11:45AM Dec 02, 2023Observed: 3.37 ft at 12:00PM Dec 02, 2023Observed: 3.37 ft at 12:15PM Dec 02, 2023Observed: 3.37 ft at 12:30PM Dec 02, 2023Observed: 3.36 ft at 12:45PM Dec 02, 2023Observed: 3.37 ft at 1:00PM Dec 02, 2023Observed: 3.37 ft at 1:15PM Dec 02, 2023Observed: 3.37 ft at 1:30PM Dec 02, 2023Observed: 3.37 ft at 1:45PM Dec 02, 2023Observed: 3.37 ft at 2:00PM Dec 02, 2023Observed: 3.37 ft at 2:15PM Dec 02, 2023Observed: 3.37 ft at 2:30PM Dec 02, 2023Observed: 3.37 ft at 2:45PM Dec 02, 2023Observed: 3.37 ft at 3:00PM Dec 02, 2023Observed: 3.37 ft at 3:15PM Dec 02, 2023Observed: 3.37 ft at 3:30PM Dec 02, 2023Observed: 3.37 ft at 3:45PM Dec 02, 2023Observed: 3.37 ft at 4:00PM Dec 02, 2023Observed: 3.37 ft at 4:15PM Dec 02, 2023Observed: 3.37 ft at 4:30PM Dec 02, 2023Observed: 3.37 ft at 4:45PM Dec 02, 2023Observed: 3.37 ft at 5:00PM Dec 02, 2023Observed: 3.37 ft at 5:15PM Dec 02, 2023Observed: 3.37 ft at 5:30PM Dec 02, 2023Observed: 3.37 ft at 5:45PM Dec 02, 2023Observed: 3.36 ft at 6:00PM Dec 02, 2023Observed: 3.36 ft at 6:15PM Dec 02, 2023Observed: 3.36 ft at 6:30PM Dec 02, 2023Observed: 3.37 ft at 6:45PM Dec 02, 2023Observed: 3.37 ft at 7:00PM Dec 02, 2023Observed: 3.36 ft at 7:15PM Dec 02, 2023Observed: 3.36 ft at 7:30PM Dec 02, 2023Observed: 3.36 ft at 7:45PM Dec 02, 2023Observed: 3.36 ft at 8:00PM Dec 02, 2023Observed: 3.36 ft at 8:15PM Dec 02, 2023Observed: 3.36 ft at 8:30PM Dec 02, 2023Observed: 3.36 ft at 8:45PM Dec 02, 2023Observed: 3.36 ft at 9:00PM Dec 02, 2023Observed: 3.36 ft at 9:15PM Dec 02, 2023Observed: 3.36 ft at 9:30PM Dec 02, 2023Observed: 3.36 ft at 9:45PM Dec 02, 2023Observed: 3.36 ft at 10:00PM Dec 02, 2023Observed: 3.36 ft at 10:15PM Dec 02, 2023Observed: 3.36 ft at 10:30PM Dec 02, 2023Observed: 3.36 ft at 10:45PM Dec 02, 2023Observed: 3.36 ft at 11:00PM Dec 02, 2023Observed: 3.36 ft at 11:15PM Dec 02, 2023Observed: 3.36 ft at 11:30PM Dec 02, 2023Observed: 3.36 ft at 11:45PM Dec 02, 2023Observed: 3.36 ft at 12:00AM Dec 03, 2023Observed: 3.36 ft at 12:15AM Dec 03, 2023Observed: 3.36 ft at 12:30AM Dec 03, 2023Observed: 3.36 ft at 12:45AM Dec 03, 2023Observed: 3.37 ft at 1:00AM Dec 03, 2023Observed: 3.36 ft at 1:15AM Dec 03, 2023Observed: 3.36 ft at 1:30AM Dec 03, 2023Observed: 3.36 ft at 1:45AM Dec 03, 2023Observed: 3.36 ft at 2:00AM Dec 03, 2023Observed: 3.36 ft at 2:15AM Dec 03, 2023Observed: 3.37 ft at 2:30AM Dec 03, 2023Observed: 3.37 ft at 2:45AM Dec 03, 2023Observed: 3.37 ft at 3:00AM Dec 03, 2023Observed: 3.37 ft at 3:15AM Dec 03, 2023Observed: 3.37 ft at 3:30AM Dec 03, 2023Observed: 3.37 ft at 3:45AM Dec 03, 2023Observed: 3.37 ft at 4:00AM Dec 03, 2023Observed: 3.37 ft at 4:15AM Dec 03, 2023Observed: 3.37 ft at 4:30AM Dec 03, 2023Observed: 3.36 ft at 4:45AM Dec 03, 2023Observed: 3.37 ft at 5:00AM Dec 03, 2023Observed: 3.37 ft at 5:15AM Dec 03, 2023Observed: 3.37 ft at 5:30AM Dec 03, 2023Observed: 3.37 ft at 5:45AM Dec 03, 2023Observed: 3.37 ft at 6:00AM Dec 03, 2023Observed: 3.36 ft at 6:15AM Dec 03, 2023Observed: 3.37 ft at 6:30AM Dec 03, 2023Observed: 3.37 ft at 6:45AM Dec 03, 2023Observed: 3.36 ft at 7:00AM Dec 03, 2023Observed: 3.37 ft at 7:15AM Dec 03, 2023Observed: 3.37 ft at 7:30AM Dec 03, 2023Observed: 3.37 ft at 7:45AM Dec 03, 2023Observed: 3.37 ft at 8:00AM Dec 03, 2023Observed: 3.37 ft at 8:15AM Dec 03, 2023Observed: 3.37 ft at 8:30AM Dec 03, 2023Observed: 3.37 ft at 8:45AM Dec 03, 2023Observed: 3.37 ft at 9:00AM Dec 03, 2023Observed: 3.37 ft at 9:15AM Dec 03, 2023Observed: 3.37 ft at 9:30AM Dec 03, 2023Observed: 3.37 ft at 9:45AM Dec 03, 2023Observed: 3.37 ft at 10:00AM Dec 03, 2023Observed: 3.37 ft at 10:15AM Dec 03, 2023Observed: 3.37 ft at 10:30AM Dec 03, 2023Observed: 3.36 ft at 10:45AM Dec 03, 2023Observed: 3.37 ft at 11:00AM Dec 03, 2023Observed: 3.37 ft at 11:15AM Dec 03, 2023Observed: 3.37 ft at 11:30AM Dec 03, 2023Observed: 3.37 ft at 11:45AM Dec 03, 2023Observed: 3.38 ft at 12:00PM Dec 03, 2023Observed: 3.38 ft at 12:15PM Dec 03, 2023Observed: 3.38 ft at 12:30PM Dec 03, 2023Observed: 3.37 ft at 12:45PM Dec 03, 2023Observed: 3.37 ft at 1:00PM Dec 03, 2023Observed: 3.37 ft at 1:15PM Dec 03, 2023Observed: 3.37 ft at 1:30PM Dec 03, 2023Observed: 3.37 ft at 1:45PM Dec 03, 2023Observed: 3.37 ft at 2:00PM Dec 03, 2023Observed: 3.37 ft at 2:15PM Dec 03, 2023Observed: 3.37 ft at 2:30PM Dec 03, 2023Observed: 3.37 ft at 2:45PM Dec 03, 2023Observed: 3.37 ft at 3:00PM Dec 03, 2023Observed: 3.37 ft at 3:15PM Dec 03, 2023Observed: 3.37 ft at 3:30PM Dec 03, 2023Observed: 3.37 ft at 3:45PM Dec 03, 2023Observed: 3.37 ft at 4:00PM Dec 03, 2023Observed: 3.37 ft at 4:15PM Dec 03, 2023Observed: 3.37 ft at 4:30PM Dec 03, 2023Observed: 3.37 ft at 4:45PM Dec 03, 2023Observed: 3.37 ft at 5:00PM Dec 03, 2023Observed: 3.37 ft at 5:15PM Dec 03, 2023Observed: 3.37 ft at 5:30PM Dec 03, 2023Observed: 3.37 ft at 5:45PM Dec 03, 2023Observed: 3.38 ft at 6:00PM Dec 03, 2023Observed: 3.38 ft at 6:15PM Dec 03, 2023Observed: 3.38 ft at 6:30PM Dec 03, 2023Observed: 3.37 ft at 6:45PM Dec 03, 2023Observed: 3.37 ft at 7:00PM Dec 03, 2023Observed: 3.37 ft at 7:15PM Dec 03, 2023Observed: 3.37 ft at 7:30PM Dec 03, 2023Observed: 3.37 ft at 7:45PM Dec 03, 2023Observed: 3.37 ft at 8:00PM Dec 03, 2023Observed: 3.37 ft at 8:15PM Dec 03, 2023Observed: 3.37 ft at 8:30PM Dec 03, 2023Observed: 3.37 ft at 8:45PM Dec 03, 2023Observed: 3.37 ft at 9:00PM Dec 03, 2023Observed: 3.37 ft at 9:15PM Dec 03, 2023Observed: 3.37 ft at 9:30PM Dec 03, 2023Observed: 3.37 ft at 9:45PM Dec 03, 2023Observed: 3.37 ft at 10:00PM Dec 03, 2023Observed: 3.37 ft at 10:15PM Dec 03, 2023Observed: 3.37 ft at 10:30PM Dec 03, 2023Observed: 3.38 ft at 10:45PM Dec 03, 2023Observed: 3.38 ft at 11:00PM Dec 03, 2023Observed: 3.38 ft at 11:15PM Dec 03, 2023Observed: 3.38 ft at 11:30PM Dec 03, 2023Observed: 3.38 ft at 11:45PM Dec 03, 2023Observed: 3.38 ft at 12:00AM Dec 04, 2023Observed: 3.38 ft at 12:15AM Dec 04, 2023Observed: 3.37 ft at 12:30AM Dec 04, 2023Observed: 3.38 ft at 12:45AM Dec 04, 2023Observed: 3.37 ft at 1:00AM Dec 04, 2023Observed: 3.37 ft at 1:15AM Dec 04, 2023Observed: 3.37 ft at 1:30AM Dec 04, 2023Observed: 3.37 ft at 1:45AM Dec 04, 2023Observed: 3.37 ft at 2:00AM Dec 04, 2023Observed: 3.37 ft at 2:15AM Dec 04, 2023Observed: 3.37 ft at 2:30AM Dec 04, 2023Observed: 3.37 ft at 2:45AM Dec 04, 2023Observed: 3.37 ft at 3:00AM Dec 04, 2023Observed: 3.37 ft at 3:15AM Dec 04, 2023Observed: 3.37 ft at 3:30AM Dec 04, 2023Observed: 3.37 ft at 3:45AM Dec 04, 2023Observed: 3.37 ft at 4:00AM Dec 04, 2023Observed: 3.37 ft at 4:15AM Dec 04, 2023Observed: 3.37 ft at 4:30AM Dec 04, 2023Observed: 3.37 ft at 4:45AM Dec 04, 2023Observed: 3.37 ft at 5:00AM Dec 04, 2023Observed: 3.37 ft at 5:15AM Dec 04, 2023Observed: 3.37 ft at 5:30AM Dec 04, 2023Observed: 3.37 ft at 5:45AM Dec 04, 2023Observed: 3.37 ft at 6:00AM Dec 04, 2023Observed: 3.37 ft at 6:15AM Dec 04, 2023Observed: 3.37 ft at 6:30AM Dec 04, 2023Observed: 3.37 ft at 7:00AM Dec 04, 2023Observed: 3.37 ft at 7:15AM Dec 04, 2023Observed: 3.37 ft at 7:30AM Dec 04, 2023Observed: 3.37 ft at 7:45AM Dec 04, 2023Observed: 3.37 ft at 8:15AM Dec 04, 2023Observed: 3.37 ft at 8:30AM Dec 04, 2023Observed: 3.37 ft at 8:45AM Dec 04, 2023Observed: 3.37 ft at 9:00AM Dec 04, 2023Observed: 3.37 ft at 9:15AM Dec 04, 2023Observed: 3.37 ft at 9:30AM Dec 04, 2023Observed: 3.37 ft at 9:45AM Dec 04, 2023Observed: 3.38 ft at 10:15AM Dec 04, 2023Observed: 3.38 ft at 10:30AM Dec 04, 2023Observed: 3.37 ft at 10:45AM Dec 04, 2023Observed: 3.38 ft at 11:00AM Dec 04, 2023Observed: 3.38 ft at 11:15AM Dec 04, 2023Observed: 3.38 ft at 11:30AM Dec 04, 2023Observed: 3.38 ft at 11:45AM Dec 04, 2023Observed: 3.38 ft at 12:00PM Dec 04, 2023Observed: 3.38 ft at 12:15PM Dec 04, 2023Observed: 3.38 ft at 12:30PM Dec 04, 2023Observed: 3.38 ft at 12:45PM Dec 04, 2023Observed: 3.37 ft at 1:00PM Dec 04, 2023Observed: 3.37 ft at 1:15PM Dec 04, 2023Observed: 3.37 ft at 1:30PM Dec 04, 2023Observed: 3.37 ft at 1:45PM Dec 04, 2023Observed: 3.37 ft at 2:00PM Dec 04, 2023Observed: 3.37 ft at 2:15PM Dec 04, 2023Observed: 3.38 ft at 2:30PM Dec 04, 2023Observed: 3.38 ft at 2:45PM Dec 04, 2023Observed: 3.38 ft at 3:00PM Dec 04, 2023Observed: 3.38 ft at 3:15PM Dec 04, 2023Observed: 3.37 ft at 3:30PM Dec 04, 2023Observed: 3.37 ft at 3:45PM Dec 04, 2023Observed: 3.37 ft at 4:00PM Dec 04, 2023Observed: 3.37 ft at 4:15PM Dec 04, 2023Observed: 3.38 ft at 4:30PM Dec 04, 2023Observed: 3.38 ft at 4:45PM Dec 04, 2023Observed: 3.38 ft at 5:00PM Dec 04, 2023Observed: 3.38 ft at 5:15PM Dec 04, 2023Observed: 3.38 ft at 5:30PM Dec 04, 2023Observed: 3.38 ft at 5:45PM Dec 04, 2023Observed: 3.37 ft at 6:00PM Dec 04, 2023Observed: 3.37 ft at 6:15PM Dec 04, 2023Observed: 3.37 ft at 6:30PM Dec 04, 2023Observed: 3.37 ft at 6:45PM Dec 04, 2023Observed: 3.37 ft at 7:00PM Dec 04, 2023Observed: 3.37 ft at 7:15PM Dec 04, 2023Observed: 3.37 ft at 7:30PM Dec 04, 2023Observed: 3.37 ft at 7:45PM Dec 04, 2023Observed: 3.37 ft at 8:00PM Dec 04, 2023Observed: 3.37 ft at 8:15PM Dec 04, 2023Observed: 3.37 ft at 8:30PM Dec 04, 2023Forecast: 3.4 ft 9:00PM Dec 04, 2023Forecast: 3.4 ft 10:00PM Dec 04, 2023Forecast: 3.4 ft 11:00PM Dec 04, 2023Forecast: 3.4 ft 12:00AM Dec 05, 2023Forecast: 3.4 ft 1:00AM Dec 05, 2023Forecast: 3.4 ft 2:00AM Dec 05, 2023Forecast: 3.4 ft 3:00AM Dec 05, 2023Forecast: 3.4 ft 4:00AM Dec 05, 2023Forecast: 3.4 ft 5:00AM Dec 05, 2023Forecast: 3.4 ft 6:00AM Dec 05, 2023Forecast: 3.4 ft 7:00AM Dec 05, 2023Forecast: 3.4 ft 8:00AM Dec 05, 2023Forecast: 3.4 ft 9:00AM Dec 05, 2023Forecast: 3.4 ft 10:00AM Dec 05, 2023Forecast: 3.4 ft 11:00AM Dec 05, 2023Forecast: 3.4 ft 12:00PM Dec 05, 2023Forecast: 3.4 ft 1:00PM Dec 05, 2023Forecast: 3.4 ft 2:00PM Dec 05, 2023Forecast: 3.4 ft 3:00PM Dec 05, 2023Forecast: 3.4 ft 4:00PM Dec 05, 2023Forecast: 3.4 ft 5:00PM Dec 05, 2023Forecast: 3.4 ft 6:00PM Dec 05, 2023Forecast: 3.4 ft 7:00PM Dec 05, 2023Forecast: 3.4 ft 8:00PM Dec 05, 2023Forecast: 3.4 ft 9:00PM Dec 05, 2023Forecast: 3.4 ft 10:00PM Dec 05, 2023Forecast: 3.4 ft 11:00PM Dec 05, 2023Forecast: 3.4 ft 12:00AM Dec 06, 2023Forecast: 3.4 ft 1:00AM Dec 06, 2023Forecast: 3.4 ft 2:00AM Dec 06, 2023Forecast: 3.4 ft 3:00AM Dec 06, 2023Forecast: 3.4 ft 4:00AM Dec 06, 2023Forecast: 3.4 ft 5:00AM Dec 06, 2023Forecast: 3.4 ft 6:00AM Dec 06, 2023Forecast: 3.4 ft 7:00AM Dec 06, 2023Forecast: 3.4 ft 8:00AM Dec 06, 2023Forecast: 3.4 ft 9:00AM Dec 06, 2023Forecast: 3.4 ft 10:00AM Dec 06, 2023Forecast: 3.4 ft 11:00AM Dec 06, 2023Forecast: 3.4 ft 12:00PM Dec 06, 2023Forecast: 3.4 ft 1:00PM Dec 06, 2023Forecast: 3.4 ft 2:00PM Dec 06, 2023Forecast: 3.4 ft 3:00PM Dec 06, 2023Forecast: 3.5 ft 4:00PM Dec 06, 2023Forecast: 3.5 ft 5:00PM Dec 06, 2023Forecast: 3.5 ft 6:00PM Dec 06, 2023Forecast: 3.6 ft 7:00PM Dec 06, 2023Highest Forecast: 3.7 ft 8:00PM Dec 06, 2023Highest Forecast: 3.7 ft 9:00PM Dec 06, 2023Highest Forecast: 3.7 ft 10:00PM Dec 06, 2023Highest Forecast: 3.7 ft 11:00PM Dec 06, 2023Highest Forecast: 3.7 ft 12:00AM Dec 07, 2023Forecast: 3.6 ft 1:00AM Dec 07, 2023Forecast: 3.6 ft 2:00AM Dec 07, 2023Forecast: 3.5 ft 3:00AM Dec 07, 2023Forecast: 3.5 ft 4:00AM Dec 07, 2023Forecast: 3.4 ft 5:00AM Dec 07, 2023Forecast: 3.4 ft 6:00AM Dec 07, 2023Forecast: 3.4 ft 7:00AM Dec 07, 2023Forecast: 3.4 ft 8:00AM Dec 07, 2023Forecast: 3.4 ft 9:00AM Dec 07, 2023Forecast: 3.4 ft 10:00AM Dec 07, 2023Forecast: 3.4 ft 11:00AM Dec 07, 2023Forecast: 3.4 ft 12:00PM Dec 07, 2023Forecast: 3.4 ft 1:00PM Dec 07, 2023Forecast: 3.4 ft 2:00PM Dec 07, 2023Forecast: 3.4 ft 3:00PM Dec 07, 2023Forecast: 3.4 ft 4:00PM Dec 07, 2023Forecast: 3.4 ft 5:00PM Dec 07, 2023Forecast: 3.4 ft 6:00PM Dec 07, 2023Forecast: 3.4 ft 7:00PM Dec 07, 2023Forecast: 3.4 ft 8:00PM Dec 07, 2023Forecast: 3.4 ft 9:00PM Dec 07, 2023Forecast: 3.4 ft 10:00PM Dec 07, 2023Forecast: 3.4 ft 11:00PM Dec 07, 2023Forecast: 3.4 ft 12:00AM Dec 08, 2023Forecast: 3.4 ft 1:00AM Dec 08, 2023Forecast: 3.4 ft 2:00AM Dec 08, 2023Forecast: 3.4 ft 3:00AM Dec 08, 2023Forecast: 3.4 ft 4:00AM Dec 08, 2023Forecast: 3.4 ft 5:00AM Dec 08, 2023Forecast: 3.4 ft 6:00AM Dec 08, 2023Forecast: 3.4 ft 7:00AM Dec 08, 2023Forecast: 3.4 ft 8:00AM Dec 08, 2023Forecast: 3.4 ft 9:00AM Dec 08, 2023Forecast: 3.4 ft 10:00AM Dec 08, 2023Forecast: 3.4 ft 11:00AM Dec 08, 2023Forecast: 3.4 ft 12:00PM Dec 08, 2023Forecast: 3.4 ft 1:00PM Dec 08, 2023Forecast: 3.4 ft 2:00PM Dec 08, 2023Forecast: 3.4 ft 3:00PM Dec 08, 2023Forecast: 3.4 ft 4:00PM Dec 08, 2023Forecast: 3.4 ft 5:00PM Dec 08, 2023Forecast: 3.4 ft 6:00PM Dec 08, 2023Forecast: 3.4 ft 7:00PM Dec 08, 2023Forecast: 3.4 ft 8:00PM Dec 08, 2023Forecast: 3.4 ft 9:00PM Dec 08, 2023Forecast: 3.4 ft 10:00PM Dec 08, 2023Forecast: 3.4 ft 11:00PM Dec 08, 2023Forecast: 3.4 ft 12:00AM Dec 09, 2023Forecast: 3.4 ft 1:00AM Dec 09, 2023Forecast: 3.4 ft 2:00AM Dec 09, 2023Forecast: 3.4 ft 3:00AM Dec 09, 2023Forecast: 3.4 ft 4:00AM Dec 09, 2023USGS--Water Resources of the United StatesBTEC1(plotting HGIRG) Graph Created (8:45PM Dec 4, 2023)ObservedForecast (issued 1:24PM Dec 4)Latest observed value: 3.37 ft at 8:30 PM PST 4-Dec-2023. Flood Stage is 16.5 ft
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About this graph
Tabular Data (UTC)
Tabular Data (PST)
XML Data
RSS Files
Datum: NGVD29
Metadata
Reliability of the Forecast: Based on unobstructed flow

NOTE: Forecasts for the San Lorenzo River (CA) at Big Trees are issued routinely year-round.

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Flood Categories (in feet)
Major Flood Stage: 21.76
Moderate Flood Stage: 19.5
Flood Stage: 16.5
Action Stage: 14
Low Stage (in feet): -9999

Historic Crests
(1) 28.85 ft on 01/05/1982
(2) 24.54 ft on 01/09/2023
(3) 24.10 ft on 02/07/2017
(4) 24.08 ft on 02/03/1998
(5) 22.55 ft on 12/23/1955
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 16.90 ft on 03/14/2023
(2) 19.90 ft on 03/10/2023
(3) 21.83 ft on 01/14/2023
(4) 24.54 ft on 01/09/2023
(5) 22.15 ft on 12/31/2022
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
Zoom Level:16
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Gauge LocationGauge Map Marker
 Disclaimer
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
21.76 Major Flooding. At approximately 21.76 feet discharge in the San Lorenzo River is approximately 15,000 cfs. Major flooding in the Felton Grove neighborhood occurs at this stage, with roadways several feet deep and waters inundating the approaches to the Felton Covered Bridge. Felton Covered Bridge Park begins to experience widespread flooding at shallow depths. At 15,000 cfs, the City of Santa Cruz downstream will experience more serious flooding. The flood wave may take 2-3 hours to reach Santa Cruz.
19.5 Moderate Flooding. The St. Bernard Street area in Paradise Park is under several feet of water, with below grade floodplain infrastructure several feet deeper. St. Augustine Avenue neighborhood in Paradise Park begins to flood. Flooding imminent or already occurring in the Felton Grove neighborhood. Ground stories, first floors, and garages flooded. Felton Covered Bridge Park begins to flood.
16.5 Minor Flooding. Flooding is either imminent or already occurring in Paradise Park, with initial flooding in the St. Bernard Street area.
14 Monitor Stage. Stage can rise rapidly on the San Lorenzo River, up to several feet per hour. Approximately 2.5 feet below flood levels in Paradise Park and approximately 5.5 feet below flood stage in Felton Grove.
About This Location Collapse

Latitude: 37.044393° N, Longitude: 122.071389° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 16.5 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)		 Elevation
(gauge height = flood stage)		 Elevation information source
NAVD88 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 227 ft 243.5 ft Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

Current/Historical Observations:
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The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
National Weather Service
San Francisco Bay Area Weather Forecast Office
21 Grace Hopper Ave, Stop 5
Monterey, CA 93943-5505
(831) 656-1725
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