St Clair River at Algonac
Michigan — Water Level & Flood Stage
Located in St. Clair County, Michigan on the St Clair River. Live water level data from USGS, updated every 15 minutes.
Current Water Level
Gage Height
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Streamflow
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Last Reading
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This is an NWS forecast point (LID: AGCM4). Live data may be limited. View on NWS AHPS →
Flood Stages
Major Flood
578.22 ft
Minor Flood
578.02 ft
Action Stage
577.33 ft
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
7-Day Water Level Chart
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About This Gauge
NWS LID
AGCM4
River
St Clair River
County
St. Clair, MI
Coordinates
42.6158°N, 82.5436°W
Get Flood Alerts for St Clair 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 St Clair River at Algonac?
The St Clair River at Algonac gauge is maintained by USGS 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 St Clair River at Algonac?
The NWS-defined flood stage for St Clair River at Algonac is 578.02 feet. Action stage begins at 577.33 feet. Moderate flooding starts at N/A feet, and major flooding at 578.22 feet.
How do I get alerts when St Clair River rises?
Download StormCast free on Google Play, go to River Gauges, and add St Clair River at Algonac to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category — even when your screen is off.
Where is the St Clair River at Algonac gauge located?
The gauge is located in St. Clair County, Michigan at coordinates 42.6158°N, 82.5436°W. Data is provided by the U.S. Geological Survey and the National Weather Service.