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Hydrograph River at a Glance Download
Floyd River at Merrill Stage (ft)Flow (cfs)Highest Observation: 0.01 ft at 7:15AM Sep 20, 2021Observed: 0 ft at 7:30AM Sep 20, 2021Observed: 0 ft at 1:30PM Sep 20, 2021Observed: 0 ft at 7:00AM Sep 22, 2021Iowa Flood CenterMRLI4(plotting HGIR5) Graph Created (3:04AM Sep 28, 2021)ObservedLatest observed value: 0 ft at 7:00 AM CDT 22-Sep-2021. Flood Stage is 12 ft
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Datum: Not Available
NOTE: 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.

NOTE: Forecasts for the Floyd River at Merrill are issued as needed during times of high water, but are not routinely available.

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Upstream Gauge - at Le Mars Upstream Gauge Downstream Gauge Downstream Gauge - at James
Flood Categories (in feet)
Major Flood Stage: 16
Moderate Flood Stage: 14
Flood Stage: 12
Action Stage: 10
Low Stage (in feet): -9999

Historic Crests
(1) 20.00 ft on 09/18/1926
(2) 18.40 ft on 06/07/1934
(3) 18.00 ft on 06/08/1953
(4) 17.60 ft on 03/15/2019
(5) 17.00 ft on 03/24/1979
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(P): Preliminary values subject to further review.

Recent Crests
(1) 2.19 ft on 06/24/2020
(2) 17.60 ft on 03/15/2019
(3) 17.00 ft on 09/21/2018
(4) 12.20 ft on 07/31/2010
(5) 10.00 ft on 04/14/2001
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

For more information on your flood risk go to

Zoom Level:14
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Gauge LocationGauge Map Marker
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
24 230th Street at the east of the bridge at the gage will be flooded.
23 Water reaches the bottom of the bridge at the gauging location on 230th Street.
22 The highest banks and levees are overtopped.
21 the bridge on County Road C38 is overtopped.
20.5 the railroad tracks at the bridge 750 feet upstream of the gage are flooded.
19 approximately 2200 acres of farm land are flooded.
18 the water reaches the bottom of the bridge on County Road C38.
17.5 the levees protecting the sewage treatment lagoons on the left bank of the river are overtopped.
16 flooding begins to affect the eastern edges of the city of Merrill, and about 2000 acres of farm land are flooded.
14 approximately 1600 acres of farm land are flooded.
12 flooding of the low lying farm land begins.
(1) Upstream View
(2) Downstream View
About This Location Collapse

Latitude: 42.720833° N, Longitude: 96.240833° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 12 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
(gauge height = flood stage)
Elevation information source
NAVD88 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 1154.4 ft 1166.4 ft Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  
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The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
National Weather Service
Sioux Falls Weather Forecast Office
26 Weather Lane
Sioux Falls, SD 57104-0198
(605) 330-4247
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Page last modified: 2-Nov-2020 7:29 PM
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