Rivers in Iowa

Little Sioux River near Montgomery

Dickinson County, IowaNWS MLSI4Sioux Falls office

Below flood stage
1385.8ftStage

Observed Mon, Sep 28, 4:45 AM CDT

Flood stage
1391.0 ft
Record crest
1395.9 ft2024

Open the live map with the river flood outlook

Flood stages and impacts

CategoryStage
Major flood1394.5 ft
Moderate flood1393.0 ft
Minor flood1391.0 ft
Action1390.0 ft
  1. 1397.0 ftThe bridge on 140th Street west of Montgomery is overtopped.
  2. 1396.5 ft140th Street west of Montgomery begins to flood as does 130th west of the bridge at the gage.
  3. 1395.0 ft190th Avenue south of the MN/IA State Line begins to flood, and the bridge on 170th Avenue north of Highway 9 is overtopped. Water also reaches the bottom of the bridge on 120th Street west of Montgomery.
  4. 1394.5 ftHighway 9 east of the Little Sioux River bridge is flooded in two lower spots.
  5. 1393.5 ft170th Ave north of Highway 9 begins to flood as does 170th Ave near 160th St.
  6. 1393.0 ftWater begins to flood 190th Avenue north of 120th st.
  7. 1391.0 ftCrop and pasture land begin to flood.

Crest history

7 crests on NOAA’s list since 2018.

#DateStage
1June 23, 20241395.9 ft
2June 24, 20181394.9 ft
3March 16, 20191394.3 ft
4March 7, 20201391.4 ft
5April 15, 20181390.1 ft
6March 26, 20231389.9 ft
7August 18, 20251388.0 ft

Most recent crests

  • August 18, 2025: 1388.0 ft
  • June 23, 2024: 1395.9 ft
  • March 26, 2023: 1389.9 ft
  • March 7, 2020: 1391.4 ft
  • March 16, 2019: 1394.3 ft
  • June 24, 2018: 1394.9 ft
  • April 15, 2018: 1390.1 ft

Nearby

Upstream, downstream and the gauges around this one.

What this means

Forecasts by the Missouri Basin River Forecast Center. Forecasts are not available. Only observed stages are available for this point. No forecasts are available for this location Gauge reading may be affected by ice.

Sources

Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service.