Henrys Fork at St Anthony, ID
River level and flood forecast · Fremont County
The river is 3.5 ft below flood stage (7 ft).
Forecast to fall to 3.1 ft by Mon, Oct 19, 6 PM.
Flow: 1,170 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Mon, Oct 12, 8:56 AM. Forecasts change as rain falls and as upstream water arrives.
Get flood alerts for this river
An email when the National Weather Service forecasts Henrys Fork at St Anthony to flood, when it floods, and when it's over.
Flood stages
| Major flood stage | 11 ft |
| Moderate flood stage | 8.2 ft |
| Flood stage | 7 ft |
| Action stage | 6.5 ft |
| Record crest (June 8, 2011) | 8.84 ft |
What floods at each level
From the National Weather Service, highest first.
- 11 ftExtensive flooding and road closures.
- 9 ftFlooding near homes across from Keefer Island in St. Anthony.
- 8.5 ftWater 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 ftFlooding 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 ftFlooding near Del Rio Bridge.
- 7 ftFlooding will occur on Parker-Salem Road (N. 1900 E). Pastureland between the river and US Highway 20 will have minor flooding.
Highest crests on record
- 8.84 ft — June 8, 2011
- 8.62 ft — May 16, 1984
- 7.77 ft — June 4, 1975
- 7.57 ft — May 30, 1997
- 7.49 ft — May 17, 1996
Recent crests: 5.8 ft (June 14, 2022) · 4.96 ft (May 1, 2021) · 5.67 ft (April 30, 2020) · 5.85 ft (May 17, 2019) · 6.09 ft (April 28, 2018)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (ANTI1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.