Floyd River near Struble, IA
River level and flood forecast · Sioux County
Normal3.5 ftas of Mon 3 PM
The river is 10.5 ft below flood stage (14 ft).
Flow: 159 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 6 PM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 18 ft |
| Moderate flood stage | 15 ft |
| Flood stage | 14 ft |
| Action stage | 12 ft |
| Record crest (June 22, 2024) | 18.47 ft |
What floods at each level
From the National Weather Service, highest first.
- 25 ftHwy 75 may be flooded in the lowest spots and additional outbuildings and homes are in danger of flooding.
- 22 ftWater reaches the sensor feed-horn on the IFC gage and the bridge on 500th St is in danger of being overtopped.
- 20 ftThe bridge on 120th St is overtopped.
- 18.5 ftSome outbuildings begin to flood, including a few northwest of the gage location.
- 17.5 ftWater reaches the bottom of the bridge on 120th St.
- 16 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.
- 15 ftSome private roads and driveways begin to flood.
- 14 ftA significant amount of agricultural land begins to flood.
- 12 ftMinor flooding of the lowest lying agricultural areas upstream of the gage begins.
Highest crests on record
- 18.47 ft — June 22, 2024
- 16.41 ft — March 14, 2019
- 16.24 ft — September 21, 2018
- 15.86 ft — July 30, 2010
- 15.86 ft — June 20, 1983
Recent crests: 14.1 ft (July 30, 2025) · 18.47 ft (June 22, 2024) · 10.66 ft (August 6, 2023) · 6.14 ft (April 1, 2020) · 9.16 ft (October 2, 2019)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (STUI4); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.