Floyd River at Alton
Observed Mon, Sep 21, 11:00 PM CDT
- Flood stage
- 12.00 ft
- Record crest
- 26.81 ft2024
Flood stages and impacts
| Category | Stage |
|---|---|
| Major flood | 22.00 ft |
| Moderate flood | 16.00 ft |
| Minor flood | 12.00 ft |
| Action | 10.00 ft |
- 26.00 ftHwy 10 is flooded and substantial flooding is ongoing near the river throughout Alton.
- 24.00 ftSeveral houses on the north side of Alton flood. Water approaches Hwy 10 on the north side of Alton. The railroad tracks are also flooded.
- 22.00 ftMore substantial street flooding begins in Alton including 3rd Ave south of the bridge. Additional structures are also in danger of flooding.
- 20.00 ftThe lower levees in Alton may begin to be overtopped flooding some nearby industrial businesses. Hwy 60 south of Alton is flooded. Portions of Division St in Alton may also begin to flood and the bridge on 3rd Ave may also be closed.
- 18.00 ftThe entire flood plain is under water and the river is about 1/2 mile wide. The flooding still primarily only affects agricultural land and county roads.
- 16.00 ftSignificant amounts of crop and pasture land are flooded.
- 15.00 ft410th Street and Larch Avenue is inundated. Also 440th Street and Kingbird Avenue is flooded, and the water reaches the bottom of the bridge at CR L14 and 440th Street.
- 12.00 ftFlooding begins to affect the lower lying agricultural lands along the river.
Flood outlook
Chance of flooding, September to November
| Category | Chance |
|---|---|
| Minor flooding | 10% |
| Moderate flooding | 7% |
| Major flooding | Under 5% |
The three-month chances are the River Forecast Centers’ long-range flood outlook, issued August 26, 2026.
Crest history
69 crests on NOAA’s list since 1956.
| # | Date | Stage |
|---|---|---|
| 1 | June 22, 2024 | 26.81 ft |
| 2 | September 20, 2018 | 21.96 ft |
| 3 | March 14, 2019 | 20.87 ft |
| 4 | June 21, 2018 | 20.50 ft |
| 5 | May 27, 2013 | 19.19 ft |
| 6 | June 20, 1983 | 18.54 ft |
| 7 | March 23, 1979 | 18.40 ft |
| 8 | March 28, 1962 | 18.35 ft |
| 9 | June 18, 2014 | 18.04 ft |
| 10 | July 23, 2010 | 17.97 ft |
| 11 | March 4, 1969 | 17.78 ft |
| 12 | March 28, 1993 | 17.46 ft |
| 13 | April 1, 1965 | 17.36 ft |
| 14 | June 13, 1994 | 17.34 ft |
| 15 | March 28, 1960 | 17.27 ft |
| 16 | February 19, 1971 | 17.17 ft |
| 17 | April 23, 1985 | 16.93 ft |
| 18 | February 9, 1966 | 16.62 ft |
| 19 | June 13, 1984 | 16.58 ft |
| 20 | June 5, 1975 | 16.55 ft |
| 21 | July 6, 1982 | 16.39 ft |
| 22 | March 3, 1973 | 15.95 ft |
| 23 | March 3, 1961 | 15.73 ft |
| 24 | March 13, 1997 | 15.66 ft |
| 25 | March 12, 1972 | 15.59 ft |
Most recent crests
- July 31, 2025: 13.43 ft
- June 22, 2024: 26.81 ft
- May 13, 2023: 9.09 ft
- June 25, 2022: 6.43 ft
- July 14, 2021: 6.16 ft
- May 27, 2020: 8.82 ft
- March 14, 2019: 20.87 ft
- September 20, 2018: 21.96 ft
- June 21, 2018: 20.50 ft
- September 18, 2016: 11.07 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.