Big Sioux River near Brookings
No watches, warnings or advisories are in effect for this area.
Future / Actual / Minor
OWP 2.0 WWA Modal Title
01/11/2021, 10:04 PM UTC through 01/11/2021, 10:04 PM UTC
Sender
Sent
- Warning: no valid ratings curve available. Transformations to and from FEET/CFS/KCFS will not happen.
Traces and Thresholds Click to turn on/off display
Observed (OBS) 07/13/2025 8:45 AM CDTRecord: 14.8 ftCATEGORY STAGE 
Major Flooding 15 ft Moderate Flooding 10.5 ft Minor Flooding 9 ft Action 8 ft Reliability of the Forecast:
NOTE: Forecasts are issued as needed during times of high water, but are not routinely available.
River forecasts for this location take into account past and future precipitation. The stages/flows that will occur may be different if future rainfall is different than forecast.
National Water Model Hydrograph
Official NWS streamflow forecasts are produced by NWS hydrologic forecasters for river gauge locations using hydrologic models which are calibrated to that location. This process considers additional guidance and information, including local expertise and experience, to produce the best forecast possible. The NWM output provides supplemental guidance to NWS forecasters and should not be considered an official NWS river forecast.
Flood Impacts
- 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.
Gauge Location
Recent Crests
| 1. | 11.06 ft | on 06-27-2024 |
| 2. | 11.16 ft | on 04-14-2023 |
| 3. | 7.09 ft | on 05-14-2022 |
| 4. | 6.37 ft | on 04-11-2021 |
| 5. | 11.05 ft | on 03-12-2020 |
Recent Crests
| 1. | 11.06 ft | on 06-27-2024 |
| 2. | 11.16 ft | on 04-14-2023 |
| 3. | 7.09 ft | on 05-14-2022 |
| 4. | 6.37 ft | on 04-11-2021 |
| 5. | 11.05 ft | on 03-12-2020 |
| 6. | 14.34 ft | on 09-13-2019 |
| 7. | 13.05 ft | on 03-25-2019 |
| 8. | 12.30 ft | on 04-24-2018 |
| 9. | 7.40 ft | on 05-25-2017 |
| 10. | 5.53 ft | on 06-19-2016 |
| 11. | 6.54 ft | on 08-22-2015 |
| 12. | 7.66 ft | on 06-10-2014 |
| 13. | 10.47 ft | on 06-29-2013 |
| 14. | 9.06 ft | on 05-09-2012 |
| 15. | 13.33 ft | on 03-24-2011 |
| 16. | 13.66 ft | on 09-25-2010 |
| 17. | 10.84 ft | on 03-28-2009 |
| 18. | 9.55 ft | on 06-10-2008 |
| 19. | 12.09 ft | on 03-15-2007 |
| 20. | 9.45 ft | on 04-03-2006 |
| 21. | 6.15 ft | on 06-17-2005 |
| 22. | 4.44 ft | on 09-26-2004 |
| 23. | 5.78 ft | on 03-20-2003 |
| 24. | 8.79 ft | on 04-02-2002 |
| 25. | 11.69 ft | on 04-24-2001 |
| 26. | 4.86 ft | on 05-19-2000 |
| 27. | 7.96 ft | on 04-11-1999 |
| 28. | 8.55 ft | on 04-10-1998 |
| 29. | 13.19 ft | on 04-08-1997 |
| 30. | 10.48 ft | on 03-19-1996 |
| 31. | 11.90 ft | on 04-20-1995 |
| 32. | 12.08 ft | on 06-25-1994 |
| 33. | 13.50 ft | on 07-04-1993 |
| 34. | 12.28 ft | on 06-20-1992 |
| 35. | 8.32 ft | on 06-25-1991 |
| 36. | 9.85 ft | on 06-21-1990 |
| 37. | 9.18 ft | on 03-28-1989 |
| 38. | 7.62 ft | on 03-14-1988 |
| 39. | 8.02 ft | on 03-27-1987 |
| 40. | 12.63 ft | on 09-20-1986 |
| 41. | 12.51 ft | on 03-19-1985 |
| 42. | 13.70 ft | on 06-22-1984 |
| 43. | 11.16 ft | on 03-07-1983 |
| 44. | 6.76 ft | on 03-18-1982 |
| 45. | 3.01 ft | on 07-26-1981 |
| 46. | 11.93 ft | on 06-25-1980 |
| 47. | 11.71 ft | on 04-14-1979 |
| 48. | 11.84 ft | on 03-29-1978 |
| 49. | 10.02 ft | on 03-13-1977 |
| 50. | 7.61 ft | on 03-24-1976 |
| 51. | 6.04 ft | on 04-22-1975 |
| 52. | 7.57 ft | on 03-06-1974 |
| 53. | 10.26 ft | on 03-08-1973 |
| 54. | 11.36 ft | on 06-01-1972 |
| 55. | 11.50 ft | on 03-15-1971 |
| 56. | 11.24 ft | on 03-06-1970 |
| 57. | 14.77 ft | on 04-09-1969 |
| 58. | 3.51 ft | on 04-23-1968 |
| 59. | 9.54 ft | on 06-17-1967 |
| 60. | 11.66 ft | on 03-13-1966 |
| 61. | 12.34 ft | on 04-06-1965 |
| 62. | 7.14 ft | on 04-03-1964 |
| 63. | 9.72 ft | on 08-02-1963 |
| 64. | 12.95 ft | on 03-29-1962 |
| 65. | 8.50 ft | on 03-02-1961 |
| 66. | 12.28 ft | on 03-30-1960 |
| 67. | 5.00 ft | on 03-05-1959 |
| 68. | 4.58 ft | on 03-27-1958 |
| 69. | 11.67 ft | on 06-17-1957 |
| 70. | 4.42 ft | on 03-24-1956 |
| 71. | 8.62 ft | on 03-12-1955 |
| 72. | 9.79 ft | on 03-22-1954 |
Historic Crests
| 1. | 14.77 ft | on 04-09-1969 |
| 2. | 14.34 ft | on 09-13-2019 |
| 3. | 13.70 ft | on 06-22-1984 |
| 4. | 13.66 ft | on 09-25-2010 |
| 5. | 13.50 ft | on 07-04-1993 |
Historic Crests
| 1. | 14.77 ft | on 04-09-1969 |
| 2. | 14.34 ft | on 09-13-2019 |
| 3. | 13.70 ft | on 06-22-1984 |
| 4. | 13.66 ft | on 09-25-2010 |
| 5. | 13.50 ft | on 07-04-1993 |
| 6. | 13.33 ft | on 03-24-2011 |
| 7. | 13.19 ft | on 04-08-1997 |
| 8. | 13.05 ft | on 03-25-2019 |
| 9. | 12.95 ft | on 03-29-1962 |
| 10. | 12.63 ft | on 09-20-1986 |
| 11. | 12.51 ft | on 03-19-1985 |
| 12. | 12.34 ft | on 04-06-1965 |
| 13. | 12.30 ft | on 04-24-2018 |
| 14. | 12.28 ft | on 06-20-1992 |
| 15. | 12.28 ft | on 03-30-1960 |
| 16. | 12.09 ft | on 03-15-2007 |
| 17. | 12.08 ft | on 06-25-1994 |
| 18. | 11.93 ft | on 06-25-1980 |
| 19. | 11.90 ft | on 04-20-1995 |
| 20. | 11.84 ft | on 03-29-1978 |
| 21. | 11.71 ft | on 04-14-1979 |
| 22. | 11.69 ft | on 04-24-2001 |
| 23. | 11.67 ft | on 06-17-1957 |
| 24. | 11.66 ft | on 03-13-1966 |
| 25. | 11.50 ft | on 03-15-1971 |
| 26. | 11.36 ft | on 06-01-1972 |
| 27. | 11.24 ft | on 03-06-1970 |
| 28. | 11.16 ft | on 04-14-2023 |
| 29. | 11.16 ft | on 03-07-1983 |
| 30. | 11.06 ft | on 06-27-2024 |
| 31. | 11.05 ft | on 03-12-2020 |
| 32. | 10.84 ft | on 03-28-2009 |
| 33. | 10.48 ft | on 03-19-1996 |
| 34. | 10.47 ft | on 06-29-2013 |
| 35. | 10.26 ft | on 03-08-1973 |
| 36. | 10.02 ft | on 03-13-1977 |
| 37. | 9.85 ft | on 06-21-1990 |
| 38. | 9.79 ft | on 03-22-1954 |
| 39. | 9.72 ft | on 08-02-1963 |
| 40. | 9.55 ft | on 06-10-2008 |
| 41. | 9.54 ft | on 06-17-1967 |
| 42. | 9.45 ft | on 04-03-2006 |
| 43. | 9.18 ft | on 03-28-1989 |
| 44. | 9.06 ft | on 05-09-2012 |
| 45. | 8.79 ft | on 04-02-2002 |
| 46. | 8.62 ft | on 03-12-1955 |
| 47. | 8.55 ft | on 04-10-1998 |
| 48. | 8.50 ft | on 03-02-1961 |
| 49. | 8.32 ft | on 06-25-1991 |
| 50. | 8.02 ft | on 03-27-1987 |
| 51. | 7.96 ft | on 04-11-1999 |
| 52. | 7.66 ft | on 06-10-2014 |
| 53. | 7.62 ft | on 03-14-1988 |
| 54. | 7.61 ft | on 03-24-1976 |
| 55. | 7.57 ft | on 03-06-1974 |
| 56. | 7.40 ft | on 05-25-2017 |
| 57. | 7.14 ft | on 04-03-1964 |
| 58. | 7.09 ft | on 05-14-2022 |
| 59. | 6.76 ft | on 03-18-1982 |
| 60. | 6.54 ft | on 08-22-2015 |
| 61. | 6.37 ft | on 04-11-2021 |
| 62. | 6.15 ft | on 06-17-2005 |
| 63. | 6.04 ft | on 04-22-1975 |
| 64. | 5.78 ft | on 03-20-2003 |
| 65. | 5.53 ft | on 06-19-2016 |
| 66. | 5.00 ft | on 03-05-1959 |
| 67. | 4.86 ft | on 05-19-2000 |
| 68. | 4.58 ft | on 03-27-1958 |
| 69. | 4.44 ft | on 09-26-2004 |
| 70. | 4.42 ft | on 03-24-1956 |
| 71. | 3.51 ft | on 04-23-1968 |
| 72. | 3.01 ft | on 07-26-1981 |
Vertical Datum Table
| type | NAVD88 |
|---|---|
| major Flooding | 1567.80 ft |
| moderate Flooding | 1563.30 ft |
| minor Flooding | 1561.80 ft |
| action | 1560.80 ft |
| Latest Value | 1559.74 ft |
| Gauge Zero | 1552.80 ft |
Collaborative Agencies
The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
Resources
Hydrologic Resource Links
- River Forecast Centers
- NWS Sioux Falls Flooding Resource Page
- NOHRSC Snow Information
- USACE Missouri River Water Management
- USGS National Water Dashboard
- FEMA Flood Insurance Information
- South Dakota Flood Information System
- Iowa Flood Information System
- Missouri River Flood Information System
- Minnesota DNR
- Nebraska Real-Time Flood Forecasting
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