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 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 (MDT) Datum: NGVD29 Metadata

NOTE: Forecasts for the Snake River near Shelley are issued routinely year-round.

Default Hydrograph Scale to Flood Categories   Return to Area Map

Upstream Gauge

Downstream Gauge

Flood Categories (in feet) Major Flood Stage: 13.5 Moderate Flood Stage: 13 Flood Stage: 12.5 Action Stage: 12 Low Stage (in feet): -9999 Historic Crests (1) 16.97 ft on 06/17/1918 (2) 16.05 ft on 06/17/1997 (3) 14.68 ft on 06/22/1917 (4) 14.36 ft on 05/29/1928 (5) 13.15 ft on 05/28/2011 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 8.01 ft on 05/31/2022 (2) 8.74 ft on 08/05/2021 (3) 10.11 ft on 06/07/2020 (4) 11.04 ft on 04/24/2019 (5) 11.85 ft on 06/03/2018 Show More Recent Crests (P): Preliminary values subject to further review. Low Water Records (1) 2.22 ft on 11/05/1934

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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13.5	Major flooding of farmland is likely. Water may cover a few county roads near the river. Low lying properties near the river around Shelley and Firth may be inundated with water.
13	Moderate lowland flooding will occur along the river.
12.5	Water will cover the end of Highline Road near the riverjust south of Firth. Some outbuildings at the end of Highline Road will have water in or around them and water may cover some driveways. Lowland flooding will occur adjacent to the river around Shelley downstream to near Rose.
12
Photos (1) SHYI1_googleearth (2) SHYI1_map (3) SHYI1_SnakeShelley_gage (4) SHYI1_looking_upstream (5) SHYI1_looking_downstream

About This Location

Latitude: 43.413125° N, Longitude: 112.134900° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 12.5 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 4599.0 ft 4611.5 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: U.S. Geological Survey (USGS) Data and Site Info for Shelley

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 45400 CFS or 15.62 ft 50   Year Peak Flood 51400 CFS or 16.68 ft 100 Year Peak Flood 57300 CFS or 17.69 ft 200 Year Peak Flood 63200 CFS or 18.67 ft 500 Year Peak Flood 71100 CFS or 19.94 ft

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