Illinois River near Henry, IL
River level and flood forecast · Marshall County
Normal15.3 ftas of Mon 1:45 PM
The river is 7.7 ft below flood stage (23 ft).
Forecast to fall to 15.0 ft by Mon, Oct 19, 7 AM.
Flow: 11,700 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Mon, Oct 12, 9:40 AM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 31 ft |
| Moderate flood stage | 24 ft |
| Flood stage | 23 ft |
| Action stage | 22 ft |
| Record crest (April 22, 2013) | 32.94 ft |
What floods at each level
From the National Weather Service, highest first.
- 32.5 ftIllinois Route 18 in Marshall County is closed. Parts of Illinois Route 17 between Sparland and Lacon are closed.
- 32 ftWater begins flooding parts of Illinois Route 18 between Henry and Illinois Route 26. Parts of Illinois Route 17 begin to flood.
- 30.5 ftThe Marina building is flooded. Inundation from Waterworks Park on Cromwell Drive toward old grain elevator location on Water Street.
- 29.6 ftA few homes begin to flood in Henry.
- 28.5 ftHennepin levee overtopped.
- 28 ftFlooding begins to affect buildings east of Illinois Route 29 in Sparland.
- 23 ftWater begins to affect the marina in Henry along with minor flooding of land adjacent to the river.
Highest crests on record
- 32.94 ft — April 22, 2013
- 32.67 ft — March 22, 1979
- 32.2 ft — May 23, 1943
- 32.02 ft — March 7, 1985
- 31.62 ft — May 21, 2020
Recent crests: 23.12 ft (July 7, 2026) · 24.24 ft (June 24, 2026) · 21.94 ft (April 21, 2026) · 22.06 ft (April 7, 2026) · 22.63 ft (May 2, 2024)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (HNYI2); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.