Missouri River at St. Charles, MO
River level and flood forecast · St. Louis County
Normal14.3 ftas of Mon 3:30 PM
The river is 10.7 ft below flood stage (25 ft).
Forecast to fall to 13.4 ft by Sat, Oct 17, 7 AM.
Flow: 83,800 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Mon, Oct 12, 9:21 AM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 36 ft |
| Moderate flood stage | 30 ft |
| Flood stage | 25 ft |
| Action stage | 23 ft |
| Record crest (June 24, 1844) | 40.11 ft |
What floods at each level
From the National Weather Service, highest first.
- 42.2 ftThis is the approximate minimum level of protection provided by the Monarch levee protecting Chesterfield Valley. Since this gage is affected by Mississippi River backwater, the actual level of overtopping may be higher.
- 38 ftFloor of the gage house.
- 37 ftResidences north of St. Charles become cut off near this height.
- 36 ftMajor flooding begins. The levee at the Highway 370 bridge is overtopped.
- 35 ftThe levee at the Highway 370 bridge overtops near this height. Missouri State Route F northwest of Defiance along Femme Osage Creek will be closed near this height.
- 34.5 ftMissouri Highway 94 near Route H will be closed in both directions near this height.
- 33 ftUp to 7 non-Federal levees are overtopped. (USACE)
- 32.5 ftThe west end of Greens Bottom Road floods. This road connects Pittman Hill Road and Jungs Station Road south of 94.
- 32 ftNear this height, Missouri Bottom Road begins flooding between Prouhet Farm Road and Aubuchon Road.
- 30.7 ftNear this height, the base of the Lewis and Clark Boat House will begin flooding.
- 28 ftNear this height, Aubuchon Road and Charbonier Road begin flooding between Teson Road and Riverwood Estates Boulevard.
- 27 ftThe Katy Trail begins flooding near this height along Hawning Road, about 2 miles north northeast of the Highway 370 bridge.
- 25 ftDownstream near this stage, Missouri Route H at Island Road and agricultural bottomland may begin flooding, depending on Mississippi River flow and backwater.
- 21 ftAn access road to farmland on Bonhomme Island gets cut off above this height.
Highest crests on record
- 40.11 ft — June 24, 1844
- 40.04 ft — August 2, 1993
- 37.5 ft — October 7, 1986
- 37.3 ft — July 20, 1951
- 36.8 ft — June 7, 1903
Recent crests: 27.61 ft (May 1, 2024) · 25.27 ft (June 4, 2022) · 26.84 ft (May 6, 2022) · 29.21 ft (June 29, 2021) · 26.42 ft (April 13, 2021)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (SCLM7); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.