Major Flood
19 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
17 ft
Minor Flood
15 ft
Action Stage
13 ft
What Floods at Each Level
24.5 ft
Water reaches the top of the levee at the invert at Highway V66.
23.7 ft
Water reaches the top of the levee invert on the west side of Marengo.
22 ft
Water approaches the top of the levee on the south bank at Marengo.
20.9 ft
Water reaches the bottom of the Highway V66 bridge.
19.5 ft
Water affects the Whirlpool Corporation parking lot and southeast exterior of the plant in Middle Amana.
19 ft
Homes west of Marengo are affected by floodwaters. Significant flooding of agricultural land.
18 ft
Water breaches the mill race dikes near Middle Amana.
17 ft
Extensive inundation of agricultural land.
16 ft
Water affects agricultural land along the river. Water is several feet deep in places.
15 ft
Water reaches the bottom of the levee surrounding Marengo. Water affects low lying agricultural land along the river
14 ft
Low lying agricultural land and pastureland along the river upstream of Marengo is affected.
11 ft
Water affects the lowest agricultural land along the river.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Jun 11, 2008 | 21.38 ft | 51,000 cfs |
| May 30, 2013 | 20.36 ft | 37,200 cfs |
| Jul 18, 1993 | 20.31 ft | 38,000 cfs |
About This Gauge
Get Flood Alerts for Iowa River
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Iowa River at Marengo?
The Iowa River at Marengo gauge is maintained by USGS (site 05453100) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Iowa River at Marengo?
The NWS-defined flood stage for Iowa River at Marengo is 15 feet. Action stage begins at 13 feet. Moderate flooding starts at 17 feet, and major flooding at 19 feet.
How do I get alerts when Iowa River rises?
Download StormCast free on Google Play, go to River Gauges, and add Iowa River at Marengo to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category.
Where is the Iowa River at Marengo gauge located?
The gauge is located in Iowa County, Iowa at coordinates 41.8127°N, 92.0648°W. USGS site number: 05453100. Data is provided by the U.S. Geological Survey and the National Weather Service.
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On This River
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Source & Notes
Data provided by: U.S. Geological Survey, Observations courtesy of U.S. Geological Survey, Observations courtesy of U.S. Army Corps of Engineers
- River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 48 hours into the future from the forecast issuance time.