Rivers in Iowa
Cedar River at Janesville
Below flood stage
5.95ftStage
Observed Thu, Sep 24, 3:45 AM CDT
- Flood stage
- 13.00 ft
- Record crest
- 19.45 ft2008
Flood stages and impacts
| Category | Stage |
|---|---|
| Major flood | 18.00 ft |
| Moderate flood | 15.00 ft |
| Minor flood | 13.00 ft |
| Action | 10.00 ft |
- 14.00 ftWater threatens areas of Janesville south of 8th St.
- 13.00 ftWater affects W 3rd St and may result in evacuation of a trailer court in Janesville. Water also affects much of the Janesville city park as well as nearby gravel roads.
- 12.00 ftWidespread lowland flooding occurs especially within the city park. The flooding covers approximately 6000 acres.
- 11.00 ftLowland flooding of the city park occurs.
Flood outlook
Chance of flooding, September to November
| Category | Chance |
|---|---|
| Minor flooding | 8% |
| Moderate flooding | Under 5% |
| Major flooding | Under 5% |
The three-month chances are the River Forecast Centers’ long-range flood outlook, issued August 28, 2026.
Crest history
109 crests on NOAA’s list since 1905.
| # | Date | Stage |
|---|---|---|
| 1 | June 10, 2008 | 19.45 ft |
| 2 | July 22, 1999 | 17.15 ft |
| 3 | March 28, 1961 | 16.33 ft |
| 4 | March 3, 1965 | 16.33 ft |
| 5 | September 24, 2016 | 16.27 ft |
| 6 | March 17, 1945 | 16.20 ft |
| 7 | March 16, 1929 | 16.00 ft |
| 8 | April 1, 1933 | 16.00 ft |
| 9 | August 18, 1993 | 15.74 ft |
| 10 | August 30, 2021 | 15.11 ft |
| 11 | May 22, 2013 | 14.62 ft |
| 12 | June 25, 2024 | 14.36 ft |
| 13 | April 7, 1965 | 14.33 ft |
| 14 | March 1, 1948 | 14.10 ft |
| 15 | April 9, 1951 | 14.05 ft |
| 16 | March 31, 1962 | 13.86 ft |
| 17 | July 1, 1969 | 13.74 ft |
| 18 | September 18, 2004 | 13.40 ft |
| 19 | April 14, 2001 | 13.30 ft |
| 20 | July 17, 1968 | 12.79 ft |
| 21 | March 28, 1950 | 12.70 ft |
| 22 | June 21, 2014 | 12.42 ft |
| 23 | March 18, 2019 | 12.40 ft |
| 24 | September 23, 2018 | 12.14 ft |
| 25 | June 22, 1954 | 12.08 ft |
Most recent crests
- August 21, 2025: 10.26 ft
- June 25, 2024: 14.36 ft
- May 17, 2023: 8.57 ft
- April 15, 2022: 6.11 ft
- August 30, 2021: 15.11 ft
- March 11, 2020: 8.89 ft
- March 18, 2019: 12.40 ft
- September 23, 2018: 12.14 ft
- October 29, 2016: 9.24 ft
- September 24, 2016: 16.27 ft
Nearby
Upstream, downstream and the gauges around this one.
What this means
Forecasts by the North Central River Forecast Center. Forecasts are issued as needed during times of high water, but are not routinely available.
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.