| 36.0 | Extensive urban flooding in lower lying portions of Sioux City begins. | | 33.0 | Some of the recreational areas and some pasture land along the river begin to flood. | | 30.0 | Some of the boat docks and marinas along the river begin to flood. | | 7.0 | The power plants around Sioux City have problems as the water levels fall below what is needed for the cooling intake valves. |
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1) 30.77 ft on 06/25/1984
2) 30.65 ft on 02/19/1971
3) 27.55 ft on 07/17/1996
4) 27.33 ft on 07/15/1993
5) 26.66 ft on 08/26/1975
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Low water records are unavailable.
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