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This probabilistic forecast is issued by the Northwest River Forecast Center.
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About this graph
Forecasts for the Henrys Fork at St Anthony are issued routinely year-round.
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Downstream Gauge Downstream Gauge - near Rexburg
Zoom Level:16
Flood Categories (in feet)
Major Flood Stage: 11
Moderate Flood Stage: 8.2
Flood Stage: 7
Action Stage: 6.5
Low Stage (in feet): -9999

Historic Crests
(1) 8.84 ft on 06/08/2011
(2) 8.62 ft on 05/16/1984
(3) 7.77 ft on 06/04/1975
(4) 7.57 ft on 05/30/1997
(5) 7.49 ft on 05/17/1996
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(P): Preliminary values subject to further review.

Recent Crests
(1) 5.80 ft on 06/14/2022
(2) 4.96 ft on 05/01/2021
(3) 5.67 ft on 04/30/2020
(4) 5.85 ft on 05/17/2019
(5) 6.09 ft on 04/28/2018
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 1.91 ft on 07/09/1973
(2) 2.08 ft on 07/20/2010
(3) 2.27 ft on 10/21/1965
Show More Low Water Records
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Gauge LocationGauge Map Marker
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 Collapse
If you notice any errors in the below information, please contact our Webmaster
11 Extensive flooding and road closures.
9 Flooding near homes across from Keefer Island in St. Anthony.
8.5 Water will impact some county roads. Major flooding of farmland will occur. Flooding over South River Road near St. Anthony. Flood waters will flow over Keefer Island in St. Anthony.
8.19 Flooding near Keefer Island. Flooding of out buildings and water seepage of homes along South River Road near St. Anthony. Extensive flooding of farm and pastureland near the river.
7.3 Flooding near Del Rio Bridge.
7 Flooding will occur on Parker-Salem Road (N. 1900 E). Pastureland between the river and US Highway 20 will have minor flooding.
(1) ANTI1_googleearth
(2) ANTI1_map
(3) ANTI1_gage
(4) ANTI1_looking_upstream
(5) ANTI1_looking_downstream

Other Real-time and/or Archive Data Sources:

Additional Information Collapse
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 10600 CFS or 7.59 ft
50   Year Peak Flood 11600 CFS or 7.96 ft
100 Year Peak Flood 12500 CFS or 8.30 ft
200 Year Peak Flood 13300 CFS or 8.59 ft
500 Year Peak Flood 14300 CFS or 8.96 ft
Collaborative Agencies Collapse
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
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Page last modified: 2-Nov-2020 7:28 PM
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