Floyd River at Merrill

Last updated: Jul 16, 2025, 6:09 AM UTC

No watches, warnings or advisories are in effect for this area.

Warning: no valid ratings curve available. Transformations to and from FEET/CFS/KCFS will not happen.

Observations courtesy of Iowa Flood Center

Scale to Flood Categories

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Observed (OBS) 07/16/2025 12:15 AM CDT

Record: 20.2 ft

CATEGORY STAGE

Major Flooding 16 ft

Moderate Flooding 14 ft

Minor Flooding 12 ft

Action 10 ft

Reliability of the Forecast:

NOTE: Forecasts are issued as needed during times of high water, but are not routinely available.

River forecasts for this location take into account past and future precipitation. The stages/flows that will occur may be different if future rainfall is different than forecast.
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	CATEGORY	STAGE
	Major Flooding	16 ft
	Moderate Flooding	14 ft
	Minor Flooding	12 ft
	Action	10 ft

Flood Impacts 🅘

24 - 230th Street 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 - 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 - The railroad tracks at the bridge 750 feet upstream of the gage are flooded.
19 - Water reaches the bottom of the bridge on County Road C38. Approximately 2200 acres of farm land are flooded.

Gauge Info

Coordinates	42.7214, -96.2401
RFC	MBRFC
State	IA
WFO	FSD
County	Plymouth
Data Provider(s)
Iowa Flood Center	Iowa Flood Center

Gauge Location

Recent Crests

1.	20.19 ft	on 06-23-2024
2.	3.75 ft	on 08-07-2023
3.	2.19 ft	on 06-24-2020
4.	17.60 ft	on 03-15-2019
5.	17.00 ft	on 09-21-2018

Historic Crests

1.	20.19 ft	on 06-23-2024
2.	20.00 ft	on 09-18-1926
3.	18.40 ft	on 06-07-1934
4.	18.00 ft	on 06-08-1953
5.	17.60 ft	on 03-15-2019

Vertical Datum Table

type	NGVD29
major Flooding	1170.40 ft
moderate Flooding	1168.40 ft
minor Flooding	1166.40 ft
action	1164.40 ft
Latest Value	1155.47 ft
Gauge Zero	1154.40 ft

Gauge Photos

Photo 1 of 2

Upstream View

Probability Information

Photo 1 of 3

Weekly Chance of Exceeding Levels
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Chance of Exceeding Levels During Entire Period
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Short Range Forecast Uncertainty
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Collaborative Agencies

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.

WFO Information

Weather Forecast Office

Sioux Falls

26 Weather Lane

Sioux Falls, SD 57104-0198

(605) 330-4247

Ask Questions/Webmaster

Official Homepage

1.	20.19 ft	on 06-23-2024
2.	3.75 ft	on 08-07-2023
3.	2.19 ft	on 06-24-2020
4.	17.60 ft	on 03-15-2019
5.	17.00 ft	on 09-21-2018
6.	12.20 ft	on 07-31-2010
7.	10.00 ft	on 04-14-2001
8.	8.70 ft	on 03-12-1997
9.	15.90 ft	on 06-21-1996
10.	13.10 ft	on 03-29-1993
11.	5.62 ft	on 07-13-1992
12.	10.80 ft	on 06-01-1991
13.	9.55 ft	on 06-17-1990
14.	5.30 ft	on 03-10-1989
15.	7.45 ft	on 08-22-1988
16.	6.17 ft	on 03-24-1987
17.	12.80 ft	on 03-18-1986
18.	13.65 ft	on 04-23-1985
19.	12.00 ft	on 06-21-1984
20.	17.00 ft	on 06-16-1983
21.	17.00 ft	on 03-24-1979
22.	15.98 ft	on 02-19-1971
23.	16.60 ft	on 04-05-1969
24.	16.50 ft	on 04-04-1966
25.	12.90 ft	on 04-01-1965
26.	16.03 ft	on 03-29-1962
27.	16.00 ft	on 03-29-1960
28.	14.00 ft	on 06-21-1954
29.	18.00 ft	on 06-08-1953
30.	14.80 ft	on 03-30-1952
31.	14.30 ft	on 07-04-1951
32.	14.50 ft	on 06-18-1950
33.	12.80 ft	on 03-05-1949
34.	13.00 ft	on 06-24-1947
35.	13.50 ft	on 03-01-1945
36.	14.20 ft	on 05-13-1944
37.	15.25 ft	on 06-04-1942
38.	15.60 ft	on 03-05-1937
39.	14.50 ft	on 03-10-1936
40.	18.40 ft	on 06-07-1934
41.	15.00 ft	on 06-09-1932
42.	12.20 ft	on 03-13-1929
43.	20.00 ft	on 09-18-1926
44.	14.50 ft	on 03-22-1917
45.	12.80 ft	on 02-20-1915
46.	14.80 ft	on 03-28-1912
47.	12.70 ft	on 03-05-1910
48.	14.00 ft	on 07-11-1909
49.	13.20 ft	on 05-17-1908
50.	16.80 ft	on 01-01-1901

1.	20.19 ft	on 06-23-2024
2.	20.00 ft	on 09-18-1926
3.	18.40 ft	on 06-07-1934
4.	18.00 ft	on 06-08-1953
5.	17.60 ft	on 03-15-2019
6.	17.00 ft	on 09-21-2018
7.	17.00 ft	on 06-16-1983
8.	17.00 ft	on 03-24-1979
9.	16.80 ft	on 01-01-1901
10.	16.60 ft	on 04-05-1969
11.	16.50 ft	on 04-04-1966
12.	16.03 ft	on 03-29-1962
13.	16.00 ft	on 03-29-1960
14.	15.98 ft	on 02-19-1971
15.	15.90 ft	on 06-21-1996
16.	15.60 ft	on 03-05-1937
17.	15.25 ft	on 06-04-1942
18.	15.00 ft	on 06-09-1932
19.	14.80 ft	on 03-28-1912
20.	14.80 ft	on 03-30-1952
21.	14.50 ft	on 03-10-1936
22.	14.50 ft	on 03-22-1917
23.	14.50 ft	on 06-18-1950
24.	14.30 ft	on 07-04-1951
25.	14.20 ft	on 05-13-1944
26.	14.00 ft	on 06-21-1954
27.	14.00 ft	on 07-11-1909
28.	13.65 ft	on 04-23-1985
29.	13.50 ft	on 03-01-1945
30.	13.20 ft	on 05-17-1908
31.	13.10 ft	on 03-29-1993
32.	13.00 ft	on 06-24-1947
33.	12.90 ft	on 04-01-1965
34.	12.80 ft	on 02-20-1915
35.	12.80 ft	on 03-18-1986
36.	12.80 ft	on 03-05-1949
37.	12.70 ft	on 03-05-1910
38.	12.20 ft	on 03-13-1929
39.	12.20 ft	on 07-31-2010
40.	12.00 ft	on 06-21-1984
41.	10.80 ft	on 06-01-1991
42.	10.00 ft	on 04-14-2001
43.	9.55 ft	on 06-17-1990
44.	8.70 ft	on 03-12-1997
45.	7.45 ft	on 08-22-1988
46.	6.17 ft	on 03-24-1987
47.	5.62 ft	on 07-13-1992
48.	5.30 ft	on 03-10-1989
49.	3.75 ft	on 08-07-2023
50.	2.19 ft	on 06-24-2020