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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 Pocatello, ID

Northwest River Forecast Center

Hydrograph

River at a Glance

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

NOTE: Stage may be affected by ice during winter months. NOTE: Forecasts are not available for the Marsh Creek (Eastern ID) near McCammon. Only observed stages are available for this point.

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Downstream Gauge

Flood Categories (in feet) Major Flood Stage: 0 Moderate Flood Stage: 0 Flood Stage: 5.5 Action Stage: 4.99 Low Stage (in feet): -9999 Historic Crests (1) 13.85 ft on 05/17/1984 (2) 13.25 ft on 02/12/1962 (3) 11.98 ft on 01/15/1980 (4) 9.59 ft on 05/14/1971 (5) 9.40 ft on 05/19/1975 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 3.38 ft on 03/15/2022 (2) 3.31 ft on 03/16/2021 (3) 4.55 ft on 02/07/2020 (4) 4.41 ft on 02/15/2019 (5) 5.13 ft on 03/23/2018 Show More Recent Crests (P): Preliminary values subject to further review. Low Water Records Currently none available. For more information on your flood risk go to www.floodsmart.gov. Show FEMA's National Flood Hazard Layers FEMA's National Flood Hazard Layers not showing? Why aren't the FEMA National Flood Hazard Layers showing on the ESRI Map? Possible reasons: There are no FEMA National Flood Hazard Layers for the location which you are viewing on ESRI Maps. The FEMA Web Mapping Service (WMS) is down. Note: Your zoom level may have changed. ESRI's zoom levels must be between 14 and 16 to show National Flood Hazard layers.

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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5.55	Lowland flooding of fields and cropland possible from Downata Hot Springs to the confluence of the Portneuf River. Widespread water ponding from the confluence of the Portneuf to Walk Creek Road. Possible water ponding upstream Merrill Road, Goodenough Road, Robin Road, Arimo Road, Sublette Road, and Marsh Valley Road.
4.99	Near bankfull from Downata Hot Springs to the confluence of the Portneuf River. Isolated areas of lowland flooding possible along with ponding.

About This Location

Latitude: 42.629825° N, Longitude: 112.225375° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 5.5 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 4610 Not Available 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 McCammon

Additional Information

Historical Peak Flows     (Scroll to Streamflow Statistics for more years) USGS Historical Peak Flows Explanation Graphical View of Historical Peak Flows and Gage Analysis  25   Year Peak Flood 667 CFS or 8.10 ft 50   Year Peak Flood 783 CFS or 8.74 ft 100 Year Peak Flood 903 CFS 200 Year Peak Flood 1030 CFS 500 Year Peak Flood 1200 CFS

Resources

Hydrologic Resources Text Products Past Precipitation Forecast Precipitation River Forecast Centers River Stage Summary Inundation Mapping Locations Grassy Lake Dam Upper Snake Teacups Bear Basin Teacups

Additional Resources Area Hydrographs NWS Precipitation and River Forecasting AHPS Iframes for Developers Mobile iNWS for emergency management NWRFC CBRFC ID NRCS Snow Survey NOHRSC Snow Information USGS Current Stream Conditions USGS Water Watch

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 Pocatello Weather Forecast Office 1945 Beechcraft Ave Pocatello, ID 83204 (208) 232-9306 Ask Questions/Webmaster Page last modified: 2-Nov-2020 7:28 PM Disclaimer Credits Glossary Privacy Policy About Us Career Opportunities