Major Flood
16 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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This is an NWS forecast point (LID: MRLI4). Live data may be limited. View on NWS AHPS →
FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
14 ft
Minor Flood
12 ft
Action Stage
10 ft
What Floods at Each Level
24 ft
230th Street east of the bridge at the gage will be flooded. Water nears the feedhorn of the automated sensor and thus river level data may be lost.
23 ft
Water reaches the bottom of the bridge at the gauging location on 230th Street.
22 ft
Portions of Hwy 75 near Merrill begin to flood. The bridge on County Road C38 is overtopped. The highest banks and levees are overtopped.
20.5 ft
The railroad tracks at the bridge 750 feet upstream of the gage are flooded.
19 ft
Water reaches the bottom of the bridge on County Road C38. Approximately 2200 acres of farm land are flooded.
17.5 ft
The levees protecting the sewage treatment lagoons on the left bank of the river are overtopped.
16 ft
Flooding begins to affect the eastern edges of the city of Merrill, including some structures. The lowest portions of C44 also begin to flood. About 2000 acres of farm land are under water.
14 ft
Approximately 1600 acres of farm land are flooded. The utility station off of C44 may flood if levee protection fails.
12 ft
Flooding of the low lying farm land begins.
10 ft
The lowest banks begin to be overtopped.
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 22, 2024 | 20.19 ft | — |
| Sep 17, 1926 | 20 ft | — |
| Jun 6, 1934 | 18.4 ft | — |
About This Gauge
NWS LID
MRLI4
River
Floyd River
County
Plymouth, IA
Coordinates
42.7214°N, 96.2401°W
Get Flood Alerts for Floyd 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 Floyd River at Merrill?
The Floyd River at Merrill gauge is maintained by USGS 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 Floyd River at Merrill?
The NWS-defined flood stage for Floyd River at Merrill is 12 feet. Action stage begins at 10 feet. Moderate flooding starts at 14 feet, and major flooding at 16 feet.
How do I get alerts when Floyd River rises?
Download StormCast free on Google Play, go to River Gauges, and add Floyd River at Merrill 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 Floyd River at Merrill gauge located?
The gauge is located in Plymouth County, Iowa at coordinates 42.7214°N, 96.2401°W. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Gauges on Floyd River
On This River
More Resources
Source & Notes
Data provided by: Observations courtesy of Iowa Flood Center
- 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.
- River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 24 hours into the future from the forecast issuance time.
- Gauge reading may be affected by ice.