River stage
Janesville, Cedar River
- River level
- 2.43 ft
- Status
- Below flood stage
- 7-day change
- -0.68 ft
- Recent high
- 12.08 ft
- Recent low
- 1.60 ft
Last reported 2026-10-13 | NWS JANI4
- 30-day change
- +0.80 ft
- Average
- 3.02 ft
- Readings
- 122
- Data span
- 122 days
- Record crest
- 19.45 ft
In brief
The Cedar River at Janesville, IA read 2.43 ft on Oct 13, 2026, 7.57 ft below action stage. That is 0.80 ft higher than 30 days earlier.
Source: National Weather Service gauge JANI4
River level timeline
Stage threshold profile
Highest crests on record
| Rank | Crest | Date |
|---|---|---|
| 1 | 19.45 ft | 2008-06-10 |
| 2 | 17.15 ft | 1999-07-22 |
| 3 | 16.33 ft | 1961-03-28 |
| 4 | 16.33 ft | 1965-03-03 |
| 5 | 16.27 ft | 2016-09-24 |
| 6 | 16.20 ft | 1945-03-17 |
| 7 | 16.00 ft | 1929-03-16 |
| 8 | 16.00 ft | 1933-04-01 |
Flood crests recorded at this gauge by the National Weather Service.
What happens at each level
- 11.00 ft
Lowland flooding of the city park occurs.
- 12.00 ft
Widespread lowland flooding occurs especially within the city park. The flooding covers approximately 6000 acres.
- 13.00 ft
Water 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.
- 14.00 ft
Water threatens areas of Janesville south of 8th St.
Written by the local National Weather Service forecast office for this exact gauge.
Frequently asked questions
Is the Cedar River flooding at Janesville?
No. The Cedar River at Janesville is at 2.43 ft, 7.57 ft below action stage.
What is the flood stage at Janesville?
The National Weather Service sets action stage 10 ft, minor flooding 13 ft, moderate flooding 15 ft and major flooding 18 ft.
What is the highest the Cedar River has been at Janesville?
The highest crest on record is 19.45 ft, on 2008-06-10.
Is the Cedar River high or low right now at Janesville?
At 2.43 ft it is higher than 45% of readings over the last 122 days.
Stage and flood information from the NOAA National Weather Service (gauge JANI4); daily history from the U.S. Geological Survey (site 05458500). Last reading 2026-10-13. For flood safety decisions always follow official National Weather Service warnings.