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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 (PST) Datum: Not Available Metadata

NOTE: Graphical forecasts are not available for the Carneros Creek at Old Sonoma Road. During times of high water, forecast crest information can be found in the text products.

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Flood Categories (in feet) Major Flood Stage: 28 Moderate Flood Stage: 25 Flood Stage: 19.5 Action Stage: 17.5 Low Stage (in feet): -9999 Historic Crests Currently none available. Recent Crests Currently none available. Low Water Records Currently none available.

Zoom Level:16 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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28	Major Flood Stage. Water is 3 feet deep on floodplain. Major roadway flooding in the area, including Highway 12/121.
25	Moderate Flood Stage. Flood waters are on the floodplain. Old Sonoma Road flooded. Old Sonoma Highway and Highway 12/121 likely flooded or in jeopardy just downstream.
19.5	Minor Flood Stage. Backwatering begins at Old Sonoma Road bridge. Water level is reaching elevation of bridge, with possible overflow. NWS will issue a Flash Flood Warning if not yet already issued.
17.5	Monitor Stage. Water is 2 feet below backwatering at Old Sonoma Road bridge. NWS will issue a Flash Flood Watch if not already issued.

About This Location

Latitude: 38.256667° N, Longitude: 122.340278° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 19.5 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 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks Other Not Available Not Available

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

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