Fox River at Algonquin, IL
River level and flood forecast · McHenry County
Normal1.9 ftas of Mon 1:45 PM
The river is 1.1 ft below flood stage (3 ft).
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 6 PM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 4 ft |
| Moderate flood stage | 3.3 ft |
| Flood stage | 3 ft |
| Action stage | 2.8 ft |
| Record crest (April 1, 1916) | 4.5 ft |
What floods at each level
From the National Weather Service, highest first.
- 6 ftAlgonquin Road (IL-62) is threatened west of the river in Algonquin.
- 4 ftFlooding affects residences in Algonquin along Lowe Drive.
- 3.5 ftSome homes flood in Valley View subdivision north of St Charles.
- 3.2 ftSome homes are threatened by flooding in Richardson subdivision near Algonquin.
- 3 ftFlooding begins to affect residences along River Road in Fox River Grove. Water inundates some streets in mobile home park in Northwest Elgin. Street flooding begins in Holiday Hills.
Highest crests on record
- 4.5 ft — April 1, 1916
- 4.42 ft — July 5, 1938
- 4.4 ft — March 6, 1918
- 4.39 ft — July 23, 2017
- 4.37 ft — March 16, 1929
Recent crests: 3.16 ft (May 23, 2020) · 2.97 ft (September 17, 2019) · 3.09 ft (June 26, 2018) · 4.39 ft (July 23, 2017) · 4.03 ft (April 23, 2013)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (ALGI2); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.