Major Flood
29 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
24 ft
Minor Flood
20 ft
Action Stage
18 ft
What Floods at Each Level
37 ft
Near this height, floodwater begins to impact Grafton City Hall.
33.5 ft
Nutwood Levee is Overtopped.
32.1 ft
Methodist Church at Main St. and Vine St. begins flooding.
31 ft
The hangars at the south end of Smartt field begin to flood.
30.9 ft
Missouri Route B from Washeon Road to Seeburger Road is closed near this height.
30.1 ft
Water reaches the intersection of Main Street and Maple Street.
29.1 ft
Water reaches Main at Church Street.
29 ft
Route 100 between Grafton and Alton at Clifton Terrace is flooded near this height.
28.8 ft
Water begins entering the north hangars at Smartt Field.
28.5 ft
Water begins entering the ramps on the north end of Smartt Field as the northwest and northeast corners are already flooded.
28.4 ft
Water reaches Main Street at the Vistors Center
28.3 ft
Intersection at Main (Route 100) & Route 3 is closed. Also at this level the Northeast Corner of Smartt Airfield begins flooding. Grafton Hills Drive is closed to all but local and select (UPS, FedEx, and Amazon) delivery traffic.
28 ft
Agricultural levee north of Highway 370 is overtopped, flooding a St. Peters recreational area around a lake near 370 and Truman.
27.6 ft
Beasley Fish Market at Main Street and Overmeyer begins flooding.
27.5 ft
The intersection at Main Street and Dagget Hollow begins flooding.
26.5 ft
At this height the entrance to the Illinois Youth Center-Pere Marquette becomes flooded, forcing the evacuation of those staying there.
26.4 ft
Residential flooding in Grafton occurs.
26 ft
Water distribution system begins to flood so emergency measures begin.
25.6 ft
Water surrounds base of Aerie's Resort at Main Street (Hwy 100) near Market.
25.5 ft
Brussels Ferry closes near this height. O'Jan's Fish Stand in Grafton closes near this height.
25.2 ft
The intersection at Main Street and Canal Street begins flooding.
25 ft
Ball field south of Main Street and Hawg Pit BBQ begin flooding.
24.9 ft
Water reaches the intersection of Main St. and Edwards St.
24.7 ft
City of Grafton begins to detour traffic along Route 100 (Main Street) at Evans Street. Also at this level the Catholic Church parking lot at Main & Evans begins flooding. This represents the lowest point on Main Street in Grafton.
24 ft
Roads within Chautauqua and Elsah begin flooding near this height.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Jul 31, 1993 | 38.17 ft | 598,000 cfs |
| Jun 7, 2019 | 35.17 ft | 523,000 cfs |
| Apr 27, 1973 | 33.12 ft | — |
About This Gauge
USGS Site
NWS LID
GRFI2
River
Mississippi River
County
Jersey, IL
Coordinates
38.9681°N, 90.4289°W
Get Flood Alerts for Mississippi 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 Mississippi River at Grafton?
The Mississippi River at Grafton gauge is maintained by USGS (site 05587450) 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 Mississippi River at Grafton?
The NWS-defined flood stage for Mississippi River at Grafton is 20 feet. Action stage begins at 18 feet. Moderate flooding starts at 24 feet, and major flooding at 29 feet.
How do I get alerts when Mississippi River rises?
Download StormCast free on Google Play, go to River Gauges, and add Mississippi River at Grafton 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 Mississippi River at Grafton gauge located?
The gauge is located in Jersey County, Illinois at coordinates 38.9681°N, 90.4289°W. USGS site number: 05587450. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Gauges on Mississippi River
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Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey
- River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 24 hours into the future from the forecast issuance time.
- River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 48 hours into the future from the forecast issuance time.
- For the latest navigation status update from the U.S. Army Corps of Engineers-St. Louis District, <a href="http://www.mvs.usace.army.mil/Missions/Navigation/Status-Reports/">click here.</a>