River gauges›Iowa
RIVER GAUGE · BIG SIOUX RIVER

Big Sioux River above Hawarden

Sioux County, Iowa

Water level12.25 ft
Flow733 cfs
Last readingSep 16, 2026, 4:30 PM UTC (last recorded)
Action18.5 ft
Minor flood20.5 ft
Moderate flood24 ft
Major flood30 ft

The past week

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What floods at each level

Highest crests on record

DateLevelFlow
Jun 21, 202439.92 ft164,000 cfs
Mar 14, 201935.2 ft58,100 cfs
Jun 21, 201834 ft50,800 cfs

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