East Nishnabotna River at Red Oak, IA
River level and flood forecast · Montgomery County
Normal8.2 ftas of Mon 2 PM
The river is 9.8 ft below flood stage (18 ft).
Flow: 578 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Sat, Oct 3, 10:21 AM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 27 ft |
| Moderate flood stage | 22 ft |
| Flood stage | 18 ft |
| Action stage | 16 ft |
| Record crest (June 15, 1998) | 29.39 ft |
What floods at each level
From the National Weather Service, highest first.
- 37 ftWater begins to flow over the Coolbaugh Street bridge at the gage site.
- 36 ftWater nears the top of the federal levee protecting Red Oak.
- 30 ftWater approaches the bottom of the bridge at Coolbaugh Street.
- 29.5 ftThe airport begins to flood.
- 28.5 ftWest Coolbaugh Street begins to flood.
- 27 ft200th Street, also known as H34, begins to flood east of the airport.
- 25 ftHighway 34 west of Broadway Street begins to flood.
- 22 ftBuildings between G Avenue and the river begin to flood. Also G Avenue is likely closed due to flooding.
- 20 ftLowland flooding begins along the west bank.
- 18 ftRural lowlands begin to flood along the east bank.
Highest crests on record
- 29.39 ft — June 15, 1998
- 27.43 ft — September 13, 1972
- 26.24 ft — May 7, 2007
- 24.61 ft — March 14, 2019
- 24.09 ft — June 13, 2008
Recent crests: 11.61 ft (June 26, 2025) · 17.16 ft (May 22, 2024) · 14.43 ft (February 27, 2023) · 13.92 ft (June 16, 2022) · 9.54 ft (July 11, 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 (RDOI4); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.