Rivers in Illinois
Ohio River at Olmsted Lock and Dam Headwater
Below flood stage
21.08ftStage
Observed Sun, Sep 27, 4:00 AM CDT
- Flood stage
- 36.00 ft
- Record crest
- 48.20 ft2020
Flood stages and impacts
| Category | Stage |
|---|---|
| Major flood | 47.00 ft |
| Moderate flood | 42.00 ft |
| Minor flood | 36.00 ft |
| Action | 34.00 ft |
Flood outlook
Chance of flooding, September to November
| Category | Chance |
|---|---|
| Minor flooding | 5% |
| Moderate flooding | Under 5% |
| Major flooding | Under 5% |
The three-month chances are the River Forecast Centers’ long-range flood outlook, issued September 16, 2026.
Crest history
7 crests on NOAA’s list since 2020.
| # | Date | Stage |
|---|---|---|
| 1 | February 21, 2020 | 48.20 ft |
| 2 | March 3, 2022 | 44.79 ft |
| 3 | March 8, 2021 | 43.33 ft |
| 4 | February 20, 2025 | 42.94 ft |
| 5 | March 9, 2023 | 39.47 ft |
| 6 | January 11, 2022 | 38.10 ft |
| 7 | May 13, 2024 | 37.36 ft |
Most recent crests
- February 20, 2025: 42.94 ft
- May 13, 2024: 37.36 ft
- March 9, 2023: 39.47 ft
- March 3, 2022: 44.79 ft
- January 11, 2022: 38.10 ft
- March 8, 2021: 43.33 ft
- February 21, 2020: 48.20 ft
Nearby
Upstream, downstream and the gauges around this one.
What this means
Forecasts by the Lower Mississippi 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 48 hours into the future from the forecast issuance time.
Sources
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.