Little Sioux River at Linn Grove
Observed Wed, Sep 23, 8:00 AM CDT
- Flood stage
- 16.50 ft
- Record crest
- 29.98 ft2024
Flood stages and impacts
| Category | Stage |
|---|---|
| Major flood | 22.50 ft |
| Moderate flood | 20.00 ft |
| Minor flood | 16.50 ft |
| Action | 14.00 ft |
- 31.50 ftWeaver St is flooded in Linn Grove.
- 29.00 ftSignificant flooding is ongoing in Sioux Rapids as water reaches as far in as 2nd and Main St. Water also reaches the bottom of the bridge on Weaver St in Linn Grove.
- 28.00 ftHighway 71 south of the bridge in Sioux Rapids is flooded and at least one house in Linn Grove near the campground may flood.
- 27.00 ftThe bathroom at the campground in Linn Grove floods.
- 24.00 ftSome businesses west of Hwy 71 in Sioux Rapids are in danger of flooding. The low portion of Highway 71 north of the bridge in Sioux Rapids may begin to flood.
- 22.50 ftPark St, as well as the northern portion of 1st St in Sioux Rapids begin to flood.
- 21.00 ftThe lowest campsites at the campground in Linn Grove begin to flood.
- 20.00 ftSignificant flooding of agricultural land begins along this entire stretch of the river. Water begins to flood the lower road at the campground in Linn Grove.
- 16.50 ftMore substantial flooding of agricultural land as well as the park in Sioux Rapids begins
- 14.00 ftWater begins to overtop the lowest banks as well as spill in the lowest areas of the park in Sioux Rapids.
Flood outlook
Chance of flooding, September to November
| Category | Chance |
|---|---|
| Minor flooding | Under 5% |
| Moderate flooding | Under 5% |
| Major flooding | Under 5% |
The three-month chances are the River Forecast Centers’ long-range flood outlook, issued September 23, 2026.
Crest history
54 crests on NOAA’s list since 1962.
| # | Date | Stage |
|---|---|---|
| 1 | June 23, 2024 | 29.98 ft |
| 2 | March 16, 2019 | 24.13 ft |
| 3 | September 22, 2018 | 23.91 ft |
| 4 | June 18, 2014 | 22.91 ft |
| 5 | March 17, 2010 | 22.85 ft |
| 6 | July 17, 2011 | 22.57 ft |
| 7 | April 7, 1965 | 22.25 ft |
| 8 | March 16, 2007 | 21.30 ft |
| 9 | September 19, 2004 | 20.94 ft |
| 10 | July 2, 1993 | 20.63 ft |
| 11 | May 2, 2016 | 20.18 ft |
| 12 | June 18, 2001 | 19.88 ft |
| 13 | April 5, 2006 | 19.72 ft |
| 14 | June 17, 1984 | 19.58 ft |
| 15 | May 17, 2005 | 19.27 ft |
| 16 | June 15, 2008 | 19.09 ft |
| 17 | May 30, 2013 | 19.03 ft |
| 18 | May 25, 2017 | 18.92 ft |
| 19 | July 12, 1982 | 18.40 ft |
| 20 | June 2, 2012 | 18.35 ft |
| 21 | June 28, 2003 | 18.30 ft |
| 22 | March 24, 1979 | 18.20 ft |
| 23 | April 15, 1983 | 18.06 ft |
| 24 | April 29, 1975 | 17.85 ft |
| 25 | July 15, 2009 | 17.72 ft |
Most recent crests
- August 2, 2025: 12.87 ft
- June 23, 2024: 29.98 ft
- May 18, 2023: 13.90 ft
- March 9, 2021: 7.76 ft
- May 29, 2020: 15.72 ft
- March 16, 2019: 24.13 ft
- September 22, 2018: 23.91 ft
- May 25, 2017: 18.92 ft
- May 2, 2016: 20.18 ft
- August 20, 2015: 17.01 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.