River stage
Marengo, Iowa River
- River level
- 12.54 ft
- Status
- Below flood stage
- 7-day change
- -3.17 ft
- Recent high
- 16.01 ft
- Recent low
- 6.90 ft
Last reported 2026-10-13 | NWS MROI4
- 30-day change
- +5.57 ft
- Average
- 10.46 ft
- Readings
- 122
- Data span
- 122 days
- Record crest
- 21.38 ft
In brief
The Iowa River at Marengo, IA read 12.54 ft on Oct 13, 2026, 0.46 ft below action stage. That is 5.57 ft higher than 30 days earlier.
Source: National Weather Service gauge MROI4
At this level: Water affects the lowest agricultural land along the river.
River level timeline
Stage threshold profile
Highest crests on record
| Rank | Crest | Date |
|---|---|---|
| 1 | 21.38 ft | 2008-06-12 |
| 2 | 20.36 ft | 2013-05-31 |
| 3 | 20.31 ft | 1993-07-19 |
| 4 | 20.26 ft | 1993-07-12 |
| 5 | 19.96 ft | 2014-07-02 |
| 6 | 19.79 ft | 1969-07-12 |
| 7 | 19.57 ft | 1993-08-19 |
| 8 | 19.40 ft | 1979-03-19 |
Flood crests recorded at this gauge by the National Weather Service.
What happens at each level
- 11.00 ft
Water affects the lowest agricultural land along the river.
- 14.00 ft
Low lying agricultural land and pastureland along the river upstream of Marengo is affected.
- 15.00 ft
Water reaches the bottom of the levee surrounding Marengo. Water affects low lying agricultural land along the river
- 16.00 ft
Water affects agricultural land along the river. Water is several feet deep in places.
- 17.00 ft
Extensive inundation of agricultural land.
- 18.00 ft
Water breaches the mill race dikes near Middle Amana.
- 19.00 ft
Homes west of Marengo are affected by floodwaters. Significant flooding of agricultural land.
- 19.50 ft
Water affects the Whirlpool Corporation parking lot and southeast exterior of the plant in Middle Amana.
- 20.90 ft
Water reaches the bottom of the Highway V66 bridge.
- 22.00 ft
Water approaches the top of the levee on the south bank at Marengo.
Written by the local National Weather Service forecast office for this exact gauge.
Frequently asked questions
Is the Iowa River flooding at Marengo?
No. The Iowa River at Marengo is at 12.54 ft, 0.46 ft below action stage.
What is the flood stage at Marengo?
The National Weather Service sets action stage 13 ft, minor flooding 15 ft, moderate flooding 17 ft and major flooding 19 ft.
What is the highest the Iowa River has been at Marengo?
The highest crest on record is 21.38 ft, on 2008-06-12.
Is the Iowa River high or low right now at Marengo?
At 12.54 ft it is higher than 72% of readings over the last 122 days.
Stage and flood information from the NOAA National Weather Service (gauge MROI4); daily history from the U.S. Geological Survey (site 05453100). Last reading 2026-10-13. For flood safety decisions always follow official National Weather Service warnings.