Little Sioux River near Turin, IA
River level and flood forecast · Monona County
Normal8.1 ftas of Mon 3 PM
The river is 16.9 ft below flood stage (25 ft).
Flow: 1,110 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 6 PM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 34.5 ft |
| Moderate flood stage | 28 ft |
| Flood stage | 25 ft |
| Action stage | 22 ft |
| Record crest (March 15, 2019) | 29.57 ft |
What floods at each level
From the National Weather Service, highest first.
- 37 ftWater reaches the bottom of the E54 bridge at the gage site.
- 34.5 ftWater nears the top of the federal levee.
- 25 ftFlooding may begin near the mouth of the river downstream of Interstate 29. Upstream of the Interstate the river is contained within the levee system.
- 22 ftWater exceeds the top of the natural channel but still remains within the confines of the levee system.
Highest crests on record
- 29.57 ft — March 15, 2019
- 27.44 ft — February 19, 1971
- 27.37 ft — June 26, 2024
- 26.99 ft — June 22, 1996
- 26.54 ft — June 21, 1983
Recent crests: 17.49 ft (August 1, 2025) · 27.37 ft (June 26, 2024) · 20.59 ft (March 1, 2023) · 10.25 ft (June 5, 2022) · 9.07 ft (March 4, 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 (TURI4); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.