Cuivre River at Old Monroe

1. 37.40 ftThis is the RECORD FLOOD LEVEL that was reached on December 4 1982.
2. 37.00 ftThe levee protecting Old Monroe is overtopped, though this levee level of protection is closer to 35.5 at the old 79 bridge.
3. 35.79 ftMain Street in Old Monroe is flooded. At this height there is nothing left to prevent water from moving across town. This is the height of the pavement on the Old Monroe side of the old Highway 79 bridge.
4. 35.50 ftWater will begin moving across the lawn of the first Main Street home adjacent to the old Highway 79 bridge.
5. 33.79 ftLow Steel Elevation on Old 79 Highway Bridge is reached.
6. 33.00 ftNear this height, Missouri State Highway 79 is closed south of the Cuivre River bridge.
7. 31.80 ftOld Highway 79 floods between Old Monroe and Highway 79.
8. 31.25 ftLow steel on the BNSF railroad bridge is reached.
9. 30.80 ftThe Corner of Sycamore St. and First Street is flooded.
10. 30.00 ftMajor flooding begins. Residential flooding in Old Monroe.
11. 28.10 ftDyer Road upstream from the gage begins flooding just downstream of the new Highway 79 bridge.
12. 27.00 ftRight bank overflows.
13. 24.50 ftExtensive left bank agricultural flooding develops upstream of the gage. A utility road is flooded along the Old Monroe levee along the left bank upstream of the gage.
14. 24.00 ftInitial flooding upstream.
15. 23.50 ftMinor agricultural land begins to flood.

Chance of flooding, September to November

The three-month chances are the River Forecast Centers’ long-range flood outlook, issued August 28, 2026.

Most recent crests

• May 8, 2023: 24.86 ft
• May 7, 2022: 24.78 ft
• July 2, 2021: 26.01 ft
• June 27, 2021: 31.09 ft
• April 12, 2021: 24.29 ft
• March 19, 2021: 26.32 ft
• May 18, 2020: 24.71 ft
• April 26, 2020: 24.59 ft
• March 30, 2020: 24.38 ft
• March 21, 2020: 24.45 ft

• UpstreamCuivre River at Troy
• Mississippi River at Winfield Lock and Dam 25
• Dardenne Creek at St. Peters
• Dardenne Creek at O'Fallon
• Mississippi River at Grafton
• Illinois River at Hardin
• Missouri River at St. Charles
• Mississippi River at Mozier Landing

Forecasts by the North Central River Forecast Center. Forecasts are issued as needed during times of high water, but are not routinely available. 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.

Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.