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 March 2024. Existing AHPS content and features will be preserved and expanded within NWPS.

Experimental National Water Center Products: Flood Inundation Mapping services are now available for 10% of the U.S. population. Please visit https://www.weather.gov/owp/operations for more information. The National Hydrologic Discussion, Area Hydrologic Discussion, Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via the URL above, as described in the StoryMap here.

Weather Forecast Office San Francisco Bay Area, CA

California Nevada River Forecast Center

Hydrograph

River at a Glance

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Printable Image About this graph Tabular Data (UTC) Tabular Data (PDT) Datum: NGVD29 Metadata

NOTE: Graphical forecasts are not available for the Corte Madera Creek at Ross. During times of high water, forecast crest information can be found in the text products.

Default Hydrograph Scale to Flood Categories   Return to Area Map

Flood Categories (in feet) Major Flood Stage: 23 Moderate Flood Stage: 20 Flood Stage: 17 Action Stage: 15 Low Stage (in feet): -9999 Historic Crests Currently none available. Recent Crests Currently none available. Low Water Records Currently none available.

Zoom Level:15 Legend FEMA Layer Gauge Location 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

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23	Major Flood Stage. (Stage of 25.5 for co-located County ALERT stream gage.) Major flood inundation in town; travel along local roadways likely impossible and very dangerous. Major damage to local businesses and homes. Water is above guard rail on Lagunitas Road bridge.
20	Moderate Flood Stage. (Stage of 22.5 for co-located County ALERT stream gage.) Lagunitas Road bridge is overtopped, and 1 to several feet of flood waters inundate local businesses, residences, and roadways.
17	Minor Flood Stage. (Stage of 19.5 feet for co-located County ALERT stream gage.) Backwatering begins at Lagunitas Road bridge, with minor flooding near Town Hall and Fire Station. NWS will issue a Flash Flood Warning if not yet already issued.
15	Monitor Stage. (Stage of 17.5 for co-located County ALERT stream gage.) Water level is 2 feet below Lagunitas Road bridge soffit, and less than 2 feet below local storm drain inlets on adjacent roads and parking lots. NWS will issue a Flash Flood Watch if not yet already issued.

About This Location

Latitude: 37.962979° N, Longitude: 122.556922° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 17 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 7.97 ft 24.97 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: U.S. Geological Survey (USGS) Data and Site Info for Ross

Resources

Hydrologic Resources Text Products Past Precipitation Forecast Precipitation River Forecast Centers River Stage Summary California Data Exchange Center Most Recent Scheduled Reservoir Releases USGS Real-time Data for California USGS - Western Region Geologic Information Inundation Mapping Locations

Additional Resources Area Hydrographs NWS Precipitation and River Forecasting AHPS Iframes for Developers Mobile iNWS for emergency management Snow Information

Collaborative Agencies 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 Ask Questions/Webmaster Page last modified: 2-Nov-2020 7:27 PM Disclaimer Credits Glossary Privacy Policy About Us Career Opportunities