Rivers in Iowa

Floyd River near Struble

Sioux County, IowaNWS STUI4USGS 06600300Sioux Falls office

Below flood stage
3.62ftStage

Observed Sun, Sep 20, 10:00 AM CDT

Flood stage
14.00 ft
Record crest
18.47 ft2024

Open the live map with the river flood outlook

Flood stages and impacts

CategoryStage
Major flood18.00 ft
Moderate flood15.00 ft
Minor flood14.00 ft
Action12.00 ft
  1. 25.00 ftHwy 75 may be flooded in the lowest spots and additional outbuildings and homes are in danger of flooding.
  2. 22.00 ftWater reaches the sensor feed-horn on the IFC gage and the bridge on 500th St is in danger of being overtopped.
  3. 20.00 ftThe bridge on 120th St is overtopped.
  4. 18.50 ftSome outbuildings begin to flood, including a few northwest of the gage location.
  5. 17.50 ftWater reaches the bottom of the bridge on 120th St.
  6. 16.00 ftA couple county roads begin to flood, including the low spot on 500th St west of the bridge. A couple of stretches of the railroad between Maurice and Merrill may also flood.
  7. 15.00 ftSome private roads and driveways begin to flood.
  8. 14.00 ftA significant amount of agricultural land begins to flood.
  9. 12.00 ftMinor flooding of the lowest lying agricultural areas upstream of the gage begins.

Flood outlook

Chance of flooding, September to November

CategoryChance
Minor floodingUnder 5%
Moderate floodingUnder 5%
Major floodingUnder 5%

The three-month chances are the River Forecast Centers’ long-range flood outlook, issued August 26, 2026.

Crest history

64 crests on NOAA’s list since 1956.

#DateStage
1June 22, 202418.47 ft
2March 14, 201916.41 ft
3September 21, 201816.24 ft
4July 30, 201015.86 ft
5June 20, 198315.86 ft
6March 4, 199415.86 ft
7May 27, 201315.77 ft
8March 28, 196215.63 ft
9February 19, 197115.50 ft
10March 22, 197915.39 ft
11February 9, 196615.27 ft
12February 10, 200915.16 ft
13June 24, 197415.03 ft
14April 4, 196914.90 ft
15March 13, 200714.79 ft
16March 29, 196014.72 ft
17February 23, 198214.63 ft
18May 28, 197014.61 ft
19June 17, 199014.57 ft
20April 1, 196514.49 ft
21July 6, 197814.42 ft
22May 21, 197614.38 ft
23June 20, 198414.37 ft
24March 3, 197314.30 ft
25April 22, 198514.29 ft

Most recent crests

  • July 30, 2025: 14.10 ft
  • June 22, 2024: 18.47 ft
  • August 6, 2023: 10.66 ft
  • April 1, 2020: 6.14 ft
  • October 2, 2019: 9.16 ft
  • March 14, 2019: 16.41 ft
  • September 21, 2018: 16.24 ft
  • February 12, 2017: 9.66 ft
  • February 21, 2016: 9.88 ft
  • June 16, 2014: 14.11 ft

Nearby

Upstream, downstream and the gauges around this one.

What this means

Forecasts by the Missouri Basin River Forecast Center. Forecasts are issued as needed during times of high water, but are not routinely available. 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.

Sources

Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.