Major Flood
4 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
3.3 ft
Minor Flood
3 ft
Action Stage
2.8 ft
What Floods at Each Level
6 ft
Algonquin Road (IL-62) is threatened west of the river in Algonquin.
4 ft
Flooding affects residences in Algonquin along Lowe Drive.
3.5 ft
Some homes flood in Valley View subdivision north of St Charles.
3.2 ft
Some homes are threatened by flooding in Richardson subdivision near Algonquin.
3 ft
Flooding 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.
Impact statements from the National Weather Service, describing what typically happens at each water level.
Low-Water Impacts
1.0
River reaches zero flow except for any water released manually through gates.
What happens as water levels drop, per the National Weather Service.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Mar 31, 1916 | 4.5 ft | — |
| Jul 4, 1938 | 4.42 ft | 5,630 cfs |
| Mar 5, 1918 | 4.4 ft | 5,750 cfs |
About This Gauge
Get Flood Alerts for Fox River
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Fox River at Algonquin?
The Fox River at Algonquin gauge is maintained by USGS (site 05550000) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Fox River at Algonquin?
The NWS-defined flood stage for Fox River at Algonquin is 3 feet. Action stage begins at 2.8 feet. Moderate flooding starts at 3.3 feet, and major flooding at 4 feet.
How do I get alerts when Fox River rises?
Download StormCast free on Google Play, go to River Gauges, and add Fox River at Algonquin to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category.
Where is the Fox River at Algonquin gauge located?
The gauge is located in McHenry County, Illinois at coordinates 42.1663°N, 88.2903°W. USGS site number: 05550000. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Gauges on Fox River
On This River
Upstream: Fox River at McHenry (Stratton Lock and Dam) tailwater
Downstream: Fox River at Algonquin tailwater
More Resources
Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey