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: The National Hydrologic Discussion, Area Hydrologic Discussion, and Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via https://www.weather.gov/owp/operations, as described in the StoryMap here.

Weather Forecast Office Sacramento, CA

California Nevada River Forecast Center

Hydrograph

River at a Glance

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Probability Information Short-term Probabilistic Guidance (Experimental) Weekly Chance of Exceeding Levels Not Available Chance of Exceeding Levels During Entire Period Not Available

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Printable Image About this graph Tabular Data (UTC) Tabular Data (PDT) Datum: Not Available Metadata

NOTE: On March 9, 2023, monitor stage was updated to 36.0 ft and flood stage was updated to 42.0 ft. Observations are now valid for the full range of stage values up to 48 ft. NOTE: Forecasts for the Cosumnes River at McConnell are issued routinely year-round.

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Upstream Gauge

Flood Categories (in feet) Major Flood Stage: 51 Moderate Flood Stage: 50.9 Flood Stage: 42 Action Stage: 36 Low Stage (in feet): 0 Historic Crests (1) 49.90 ft on 01/14/1980 (2) 48.50 ft on 01/02/1997 (3) 47.10 ft on 02/18/1986 (4) 47.02 ft on 01/01/2006 (5) 46.56 ft on 02/04/1998 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 41.90 ft on 03/15/2023 (P) (2) 0.00 ft on 01/01/2023 (P) (3) 38.99 ft on 12/24/2021 (4) 32.00 ft on 01/29/2021 (5) 38.18 ft on 04/06/2020 Show More Recent Crests (P): Preliminary values subject to further review. 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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36	Monitor Stage - Water exits the river upstream and downstream of Highway 99. Dillard Road is flooded from Highway 99 to Riley Road. Twin Cities Road is flooded from Hardesty Lane to Christensen Road.
35	The Cosumnes River overflow channel begins to flow.

About This Location

Latitude: 38.357500° N, Longitude: 121.343611° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 42 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 0 ft 46 ft   Current/Historical Observations: Corps of Engineers (COE) Info for McConnell

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 WFO Sacramento Hydrology Inundation Mapping Locations

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

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