South Branch Ralston Creek at Iowa City, IA
River level and flood forecast · Johnson County
The river is 5.1 ft below flood stage (7 ft).
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.
Get flood alerts for this river
An email when the National Weather Service forecasts South Branch Ralston Creek at Iowa City to flood, when it floods, and when it's over.
Flood stages
| Flood stage | 7 ft |
| Action stage | 6 ft |
| Record crest (July 14, 1962) | 10.5 ft |
What floods at each level
From the National Weather Service, highest first.
- 8 ftWater is at the bottom of the Muscatine Avenue bridge.
- 7.5 ftWater affects the northwest approach to the Muscatine Avenue bridge.
- 6 ftWater is at the bottom of the 1st Avenue bridge.
- 4.5 ftWater is at the bottom of the F Street bridge.
- 4 ftWater is at the bottom of the Sixth Street bridge.
- 3.5 ftWater affects the north approach to the Sixth Street bridge.
Highest crests on record
- 10.5 ft — July 14, 1962
- 9.64 ft — October 6, 2018
- 9.48 ft — May 3, 2012
- 9.47 ft — July 17, 1972
- 9.43 ft — August 10, 1993
Recent crests: 6.57 ft (May 3, 2021) · 6.87 ft (June 9, 2020) · 9.64 ft (October 6, 2018) · 7.67 ft (September 25, 2018) · 7.96 ft (September 5, 2018)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (IACI4); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.