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Big Sioux River at Sioux City

Critical Stages
29' - Action
32' - Flood
38' - Moderate
41' - Major

Latest Observation

Updated: 5:30 AM CST 12/16/25

Status: No Flooding

Stage: 7.9 ft

Flow: 0.26 kcfs

Forecast

Forecast not available for this location.

TimeStage (ft)Flow (kcfs)
5:30 AM 12/16 7.9 0.26
5:15 AM 12/16 7.91 0.262
5:00 AM 12/16 7.91 0.262
4:45 AM 12/16 7.89 0.258
4:30 AM 12/16 7.9 0.26
4:15 AM 12/16 7.9 0.26
4:00 AM 12/16 7.92 0.264
3:45 AM 12/16 7.91 0.262
3:30 AM 12/16 7.9 0.26
3:15 AM 12/16 7.87 0.253
3:00 AM 12/16 7.89 0.258
2:45 AM 12/16 7.87 0.253
2:30 AM 12/16 7.86 0.251
2:15 AM 12/16 7.9 0.26
2:00 AM 12/16 7.88 0.255
1:45 AM 12/16 7.88 0.255
1:30 AM 12/16 7.92 0.264
1:16 AM 12/16 7.89 0.258
1:15 AM 12/16 7.89 0.258
1:01 AM 12/16 7.88 0.255
1:00 AM 12/16 7.88 0.255
12:46 AM 12/16 7.86 0.251
12:45 AM 12/16 7.86 0.251
12:30 AM 12/16 7.86 0.251
12:15 AM 12/16 7.87 0.253
12:00 AM 12/16 7.85 0.249
11:45 PM 12/15 7.82 0.242
11:30 PM 12/15 7.85 0.249
11:15 PM 12/15 7.84 0.247
11:00 PM 12/15 7.85 0.249
Hydrograph for Big Sioux River at Sioux City
48' - The levees on the South Dakota side are overtopped.
45.5' - More significant levee overtopping occurs in the Iowa Riverside Community.
43' - The lower levees in the Iowa Riverside community are in danger of being overtopped if not sandbagged.
38' - Most of the storm drains are submerged.
37' - Several structures south of River Dr on the SD will flood if a levee failure occurs.
35' - Some lower portions south of River Dr on the SD may be at risk of flooding with a levee failure.
32' - Agricultural land north of the leveed area begins to flood.
DateStage (ft)
Jun 23, 2024 44.9
Jun 20, 2014 37.7
Mar 17, 2019 37.46
Jun 25, 2018 31.57
Apr 2, 2020 21.89
May 4, 2016 19.04
Apr 15, 2023 18.57
May 26, 2017 17.73
Jul 10, 2015 15.09
Jun 2, 2022 14.94
Sep 1, 2021 12.37

Data provided by the National Weather Service.