Big Sioux River at Sioux Falls I-90

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RETURN TO MAP. Below is a real-time look at the gauge. Under Flood Categories -> Primary, you can find details on how high the river needs to be at that gage to trigger what stage of flood is happening. Under gauge data, you will see the latest observation and some sites will have a forecast.

Flood Categories

Primary (ft)

  • Action : 11 ft
  • Minor : 12 ft
  • Moderate : 15 ft
  • Major : 17 ft

Secondary (kcfs)

  • Action : Not Set
  • Minor : Not Set
  • Moderate : Not Set
  • Major : Not Set

The forecast flood categories are the same as the observation flood categories.

Gauge Data



Forecast Issued: Oct 15, 2019 08:54 AM -0500



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