Big Sioux River near Brookings
Critical Stages
8' - Action
9' - Flood
10.5' - Moderate
15' - Major
Latest Observation
Updated: 1:45 PM CST 12/15/25
Status: No Flooding
Stage: 4.09 ft
Flow: 0.534 kcfs
Forecast
Forecast not available for this location.
| Time | Stage (ft) | Flow (kcfs) |
|---|---|---|
| 2:45 PM 12/15 | 4.11 | 0.54 |
| 2:30 PM 12/15 | 4.11 | 0.54 |
| 2:15 PM 12/15 | 4.08 | 0.531 |
| 2:00 PM 12/15 | 4.11 | 0.54 |
| 1:45 PM 12/15 | 4.09 | 0.534 |
| 1:30 PM 12/15 | 4.1 | 0.537 |
| 1:15 PM 12/15 | 4.11 | 0.54 |
| 1:00 PM 12/15 | 4.1 | 0.537 |
| 12:45 PM 12/15 | 4.1 | 0.537 |
| 12:30 PM 12/15 | 4.14 | 0.549 |
| 12:15 PM 12/15 | 4.11 | 0.54 |
| 12:00 PM 12/15 | 4.13 | 0.546 |
| 11:45 AM 12/15 | 4.12 | 0.543 |
| 11:30 AM 12/15 | 4.12 | 0.543 |
| 11:15 AM 12/15 | 4.13 | 0.546 |
| 11:00 AM 12/15 | 4.11 | 0.54 |
| 10:45 AM 12/15 | 4.11 | 0.54 |
| 10:30 AM 12/15 | 4.11 | 0.54 |
| 10:15 AM 12/15 | 4.12 | 0.543 |
| 10:00 AM 12/15 | 4.12 | 0.543 |
| 9:45 AM 12/15 | 4.12 | 0.543 |
| 9:30 AM 12/15 | 4.11 | 0.54 |
| 9:15 AM 12/15 | 4.12 | 0.543 |
| 9:00 AM 12/15 | 4.12 | 0.543 |
| 8:45 AM 12/15 | 4.11 | 0.54 |
| 8:30 AM 12/15 | 4.12 | 0.543 |
| 8:15 AM 12/15 | 4.11 | 0.54 |
| 8:00 AM 12/15 | 4.14 | 0.549 |
| 7:45 AM 12/15 | 4.12 | 0.543 |
| 7:30 AM 12/15 | 4.14 | 0.549 |
16' -
The bridges on 473rd Avenue and 475th Avenue are overtopped.
14' -
The water reaches the bottom of the bridges on 473rd Avenue and 475th Avenue.
13' -
The bridge 1 mile south of Medary on 471st Avenue is overtopped.
12' -
475th Avenue and 222nd Street being to flood.
11.5' -
473rd Avenue at 221st Street begins to flood.
11' -
Some farm outbuildings begin to flood.
10.5' -
473rd Avenue north of the gauge begins to flood.
10' -
Flooding begins to affect agricultural lands along the right bank of the river.
9' -
Significant amounts of pasture and farm lands begin flooding on the left bank of the river. The road south of the Brookings water treatment plant is flooded, as is 217th Street between 468th and 469th Avenues.
8' -
There is some minor overflow of the lowest banks along this stretch of the river.
| Date | Stage (ft) |
|---|---|
| Apr 9, 1969 | 14.77 |
| Sep 13, 2019 | 14.34 |
| Jun 22, 1984 | 13.7 |
| Sep 25, 2010 | 13.66 |
| Jul 4, 1993 | 13.5 |
| Mar 24, 2011 | 13.33 |
| Apr 8, 1997 | 13.19 |
| Mar 25, 2019 | 13.05 |
| Mar 29, 1962 | 12.95 |
| Sep 20, 1986 | 12.63 |
| Mar 19, 1985 | 12.51 |
| Apr 6, 1965 | 12.34 |
| Apr 24, 2018 | 12.3 |
| Jun 20, 1992 | 12.28 |
| Mar 30, 1960 | 12.28 |
| Mar 15, 2007 | 12.09 |
| Jun 25, 1994 | 12.08 |
| Jun 25, 1980 | 11.93 |
| Apr 20, 1995 | 11.9 |
| Mar 29, 1978 | 11.84 |
Data provided by the National Weather Service.
