Cedar River at Janesville, IA
River level and flood forecast · Bremer County
Normal2.5 ftas of Mon 1:45 PM
The river is 10.5 ft below flood stage (13 ft).
Flow: 1,700 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Fri, Sep 18, 8:19 PM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 18 ft |
| Moderate flood stage | 15 ft |
| Flood stage | 13 ft |
| Action stage | 10 ft |
| Record crest (June 10, 2008) | 19.45 ft |
What floods at each level
From the National Weather Service, highest first.
- 14 ftWater threatens areas of Janesville south of 8th St.
- 13 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 ftWidespread lowland flooding occurs especially within the city park. The flooding covers approximately 6000 acres.
- 11 ftLowland flooding of the city park occurs.
Highest crests on record
- 19.45 ft — June 10, 2008
- 17.15 ft — July 22, 1999
- 16.33 ft — March 28, 1961
- 16.33 ft — March 3, 1965
- 16.27 ft — September 24, 2016
Recent crests: 10.26 ft (August 21, 2025) · 14.36 ft (June 25, 2024) · 8.57 ft (May 17, 2023) · 6.11 ft (April 15, 2022) · 15.11 ft (August 30, 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 (JANI4); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.