Iowa River at Marengo, IA
River level and flood forecast · Iowa County
Near flood stage13.3 ftas of Mon 2 PM
The river is 1.7 ft below flood stage (15 ft).
Forecast to fall to 10.1 ft by Mon, Oct 19, 7 AM.
Flow: 5,750 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Mon, Oct 12, 9:07 AM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 19 ft |
| Moderate flood stage | 17 ft |
| Flood stage | 15 ft |
| Action stage | 13 ft |
| Record crest (June 12, 2008) | 21.38 ft |
What floods at each level
From the National Weather Service, highest first.
- 24.5 ftWater reaches the top of the levee at the invert at Highway V66.
- 23.7 ftWater reaches the top of the levee invert on the west side of Marengo.
- 22 ftWater approaches the top of the levee on the south bank at Marengo.
- 20.9 ftWater reaches the bottom of the Highway V66 bridge.
- 19.5 ftWater affects the Whirlpool Corporation parking lot and southeast exterior of the plant in Middle Amana.
- 19 ftHomes west of Marengo are affected by floodwaters. Significant flooding of agricultural land.
- 18 ftWater breaches the mill race dikes near Middle Amana.
- 17 ftExtensive inundation of agricultural land.
- 16 ftWater affects agricultural land along the river. Water is several feet deep in places.
- 15 ftWater reaches the bottom of the levee surrounding Marengo. Water affects low lying agricultural land along the river
- 14 ftLow lying agricultural land and pastureland along the river upstream of Marengo is affected.
- 11 ftWater affects the lowest agricultural land along the river.
Highest crests on record
- 21.38 ft — June 12, 2008
- 20.36 ft — May 31, 2013
- 20.31 ft — July 19, 1993
- 20.26 ft — July 12, 1993
- 19.96 ft — July 2, 2014
Recent crests: 18.16 ft (May 26, 2024) · 17.93 ft (June 25, 2020) · 17.59 ft (June 11, 2020) · 18.44 ft (May 29, 2019) · 18.83 ft (March 17, 2019)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (MROI4); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.