Kishwaukee River at Marengo, IL
River level and flood forecast · McHenry County
Normal7.7 ftas of Mon 2:15 PM
The river is 4.3 ft below flood stage (12 ft).
Flow: 94 cubic feet per second (USGS).
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
| Flood stage | 12 ft |
| Action stage | 11.5 ft |
| Record crest (September 4, 2018) | 13.06 ft |
What floods at each level
From the National Weather Service, highest first.
- 16 ftResidences threatened along Woodbine Lane in Marengo.
- 14 ftMarengo Water Treatment Facility property threatened. Deerpass Road threatened north of Marengo.
- 13.5 ftIL-23 (State Street) threatened in Marengo.
- 12 ftBoone-McHenry County Line Road is threatened.
Highest crests on record
- 13.06 ft — September 4, 2018
- 12.67 ft — April 11, 2013
- 12.52 ft — May 18, 2020
- 12.34 ft — July 24, 2017
- 12.19 ft — July 6, 2022
Recent crests: 11.5 ft (April 3, 2024) · 12.19 ft (July 6, 2022) · 12.52 ft (May 18, 2020) · 11.51 ft (April 30, 2020) · 11.77 ft (September 14, 2019)
Up and down the river, and nearby
- DownstreamKishwaukee River at Belvidere, IL
- Nippersink Creek at Wonder Lake, IL
- Boone Creek near Mchenry, IL
- Fox River at Algonquin tailwater, IL
- Fox River at Algonquin, IL
- South Branch Kishwaukee River near Fairdale, IL
- Fox River at McHenry (Stratton Lock and Dam) tailwater, IL
- Fox River near Johnsburg, IL
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (MRGI2); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.