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Henrys Fork near Rexburg, ID

River level and flood forecast · Madison County

Normal3.2 ftas of Mon 9:15 PM

The river is 6.3 ft below flood stage (9.5 ft).

Forecast to fall to 2.8 ft by Mon, Oct 19, 6 PM.

Flow: 985 cubic feet per second (USGS).

The last 7 days and the forecast

02.557.51012.515TueThuSatMonWedFriSunAction 9 ftFlood 9.5 ftModerate 11.5 ftMajor 13 ftNowObserved (ft)NWS forecast

NWS forecast issued Mon, Oct 12, 8:56 AM. Forecasts change as rain falls and as upstream water arrives.

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Flood stages

Major flood stage13 ft
Moderate flood stage11.5 ft
Flood stage9.5 ft
Action stage9 ft
Record crest (May 17, 1984)12.05 ft

What floods at each level

From the National Weather Service, highest first.

  • 13 ftMajor and extensive flooding of farmland and pastureland near the river especially on the east bank will occur. Flooding/overtopping of access roads near the river will cut off local access. Water may start to back up on the upstream side of the Idaho State Highway 33 bridge (over the Henrys Fork) with large amounts of woody debris distributed throughout the reach. An irrigation water pump at Beaver Dick Park will be submerged and the USGS gagehouse will become affected.
  • 11.5 ftModerate flooding of farmland and pastureland near the river and side channels/sloughs will occur with impacts to farm outbuildings near W 2700 S. Some low lying secondary and access roads near the river will have water over them.
  • 9.5 ftMinor flooding of farmland near the river will occur between the confluence of the Snake River and upstream to near St. Anthony. Lower Beaver Dick Park is under water and some picnic shelters are inaccessible. Portions of Warm Slough Access will be under water.

Highest crests on record

  1. 12.05 ft — May 17, 1984
  2. 11.87 ft — June 9, 2011
  3. 11.3 ft — June 9, 2010
  4. 11.26 ft — May 18, 1996
  5. 11.21 ft — June 12, 1997

Recent crests: 9.55 ft (June 15, 2022) · 7.8 ft (May 24, 2021) · 9.32 ft (June 8, 2020) · 9.66 ft (May 19, 2019) · 10.15 ft (May 26, 2018)

Up and down the river, and nearby

See it on the live map →Radar & warnings for Madison CountyNWS gauge pageUSGS gauge 13056500

Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (REXI1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.