Little Sioux River at Linn Grove
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.
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Observed (OBS) 06/15/2025 10:00 AM CDTRecord: 30 ftCATEGORY STAGE 
Major Flooding 22.5 ft Moderate Flooding 20 ft Minor Flooding 16.5 ft Action 14 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
- 31.5 - Weaver St is flooded in Linn Grove.
- 29 - Significant flooding is ongoing in Sioux Rapids as water reaches as far in as 2nd and Main St. Water also reaches the bottom of the bridge on Weaver St in Linn Grove.
- 28 - Highway 71 south of the bridge in Sioux Rapids is flooded and at least one house in Linn Grove near the campground may flood.
- 27 - The bathroom at the campground in Linn Grove floods.
- 24 - Some businesses west of Hwy 71 in Sioux Rapids are in danger of flooding. The low portion of Highway 71 north of the bridge in Sioux Rapids may begin to flood.
Gauge Location
Recent Crests
| 1. | 29.98 ft | on 06-23-2024 |
| 2. | 13.90 ft | on 05-18-2023 |
| 3. | 7.76 ft | on 03-09-2021 |
| 4. | 15.72 ft | on 05-29-2020 |
| 5. | 24.13 ft | on 03-16-2019 |
Recent Crests
| 1. | 29.98 ft | on 06-23-2024 | |
| 2. | 13.90 ft | on 05-18-2023 | |
| 3. | 7.76 ft | on 03-09-2021 | |
| 4. | 15.72 ft | on 05-29-2020 | |
| 5. | 24.13 ft | on 03-16-2019 | |
| 6. | 23.91 ft | on 09-22-2018 | |
| 7. | 18.92 ft | on 05-25-2017 | |
| 8. | 20.18 ft | on 05-02-2016 | |
| 9. | 17.01 ft | on 08-20-2015 | |
| 10. | 22.91 ft | on 06-18-2014 | |
| 11. | 19.03 ft | on 05-30-2013 | |
| 12. | 18.35 ft | on 06-02-2012 | |
| 13. | 22.57 ft | on 07-17-2011 | |
| 14. | 22.85 ft | on 03-17-2010 | |
| 15. | 17.72 ft | on 07-15-2009 | |
| 16. | 19.09 ft | on 06-15-2008 | |
| 17. | 21.30 ft | on 03-16-2007 | |
| 18. | 19.72 ft | on 04-05-2006 | |
| 19. | 19.27 ft | on 05-17-2005 | |
| 20. | 20.94 ft | on 09-19-2004 | |
| 21. | 18.30 ft | on 06-28-2003 | |
| 22. | 17.33 ft | on 06-14-2002 | |
| 23. | 19.88 ft | on 06-18-2001 | |
| 24. | 16.88 ft | on 06-16-2000 | |
| 25. | 14.62 ft | on 06-15-1999 | 1 |
| 26. | 9.17 ft | on 06-24-1998 | 1 |
| 27. | 14.95 ft | on 03-25-1997 | 1 |
| 28. | -0.99 ft | on 03-30-1996 | 1 |
| 29. | 15.38 ft | on 05-17-1995 | 1 |
| 30. | 17.50 ft | on 06-26-1994 | |
| 31. | 20.63 ft | on 07-02-1993 | 1 |
| 32. | 15.35 ft | on 04-23-1992 | 1 |
| 33. | 14.46 ft | on 04-18-1991 | 1 |
| 34. | 11.36 ft | on 06-21-1990 | 1 |
| 35. | 8.02 ft | on 03-13-1989 | 1 |
| 36. | 9.86 ft | on 04-06-1988 | 1 |
| 37. | 14.52 ft | on 03-28-1987 | 1 |
| 38. | 16.04 ft | on 03-22-1986 | 1 |
| 39. | 16.21 ft | on 04-26-1985 | 1 |
| 40. | 19.58 ft | on 06-17-1984 | 1 |
| 41. | 18.06 ft | on 04-15-1983 | 1 |
| 42. | 18.40 ft | on 07-12-1982 | 1 |
| 43. | 10.19 ft | on 06-19-1981 | 1 |
| 44. | 14.34 ft | on 11-05-1979 | 1 |
| 45. | 18.20 ft | on 03-24-1979 | 1 |
| 46. | 14.80 ft | on 07-27-1978 | 1 |
| 47. | 7.76 ft | on 03-14-1977 | 1 |
| 48. | 10.86 ft | on 03-15-1976 | 1 |
| 49. | 17.85 ft | on 04-29-1975 | 1 |
| 50. | 10.77 ft | on 11-23-1973 | 1 |
| 51. | 14.52 ft | on 03-07-1973 | 1 |
| 52. | 22.25 ft | on 04-07-1965 | 1 |
| 53. | -0.99 ft | on 03-01-1962 |
Historic Crests
| 1. | 29.98 ft | on 06-23-2024 |
| 2. | 24.13 ft | on 03-16-2019 |
| 3. | 23.91 ft | on 09-22-2018 |
| 4. | 22.91 ft | on 06-18-2014 |
| 5. | 22.85 ft | on 03-17-2010 |
Historic Crests
| 1. | 29.98 ft | on 06-23-2024 | |
| 2. | 24.13 ft | on 03-16-2019 | |
| 3. | 23.91 ft | on 09-22-2018 | |
| 4. | 22.91 ft | on 06-18-2014 | |
| 5. | 22.85 ft | on 03-17-2010 | |
| 6. | 22.57 ft | on 07-17-2011 | |
| 7. | 22.25 ft | on 04-07-1965 | 1 |
| 8. | 21.30 ft | on 03-16-2007 | |
| 9. | 20.94 ft | on 09-19-2004 | |
| 10. | 20.63 ft | on 07-02-1993 | 1 |
| 11. | 20.18 ft | on 05-02-2016 | |
| 12. | 19.88 ft | on 06-18-2001 | |
| 13. | 19.72 ft | on 04-05-2006 | |
| 14. | 19.58 ft | on 06-17-1984 | 1 |
| 15. | 19.27 ft | on 05-17-2005 | |
| 16. | 19.09 ft | on 06-15-2008 | |
| 17. | 19.03 ft | on 05-30-2013 | |
| 18. | 18.92 ft | on 05-25-2017 | |
| 19. | 18.40 ft | on 07-12-1982 | 1 |
| 20. | 18.35 ft | on 06-02-2012 | |
| 21. | 18.30 ft | on 06-28-2003 | |
| 22. | 18.20 ft | on 03-24-1979 | 1 |
| 23. | 18.06 ft | on 04-15-1983 | 1 |
| 24. | 17.85 ft | on 04-29-1975 | 1 |
| 25. | 17.72 ft | on 07-15-2009 | |
| 26. | 17.50 ft | on 06-26-1994 | |
| 27. | 17.33 ft | on 06-14-2002 | |
| 28. | 17.01 ft | on 08-20-2015 | |
| 29. | 16.88 ft | on 06-16-2000 | |
| 30. | 16.21 ft | on 04-26-1985 | 1 |
| 31. | 16.04 ft | on 03-22-1986 | 1 |
| 32. | 15.72 ft | on 05-29-2020 | |
| 33. | 15.38 ft | on 05-17-1995 | 1 |
| 34. | 15.35 ft | on 04-23-1992 | 1 |
| 35. | 14.95 ft | on 03-25-1997 | 1 |
| 36. | 14.80 ft | on 07-27-1978 | 1 |
| 37. | 14.62 ft | on 06-15-1999 | 1 |
| 38. | 14.52 ft | on 03-07-1973 | 1 |
| 39. | 14.52 ft | on 03-28-1987 | 1 |
| 40. | 14.46 ft | on 04-18-1991 | 1 |
| 41. | 14.34 ft | on 11-05-1979 | 1 |
| 42. | 13.90 ft | on 05-18-2023 | |
| 43. | 11.36 ft | on 06-21-1990 | 1 |
| 44. | 10.86 ft | on 03-15-1976 | 1 |
| 45. | 10.77 ft | on 11-23-1973 | 1 |
| 46. | 10.19 ft | on 06-19-1981 | 1 |
| 47. | 9.86 ft | on 04-06-1988 | 1 |
| 48. | 9.17 ft | on 06-24-1998 | 1 |
| 49. | 8.02 ft | on 03-13-1989 | 1 |
| 50. | 7.76 ft | on 03-09-2021 | |
| 51. | 7.76 ft | on 03-14-1977 | 1 |
| 52. | -0.99 ft | on 03-01-1962 | |
| 53. | -0.99 ft | on 03-30-1996 | 1 |
Vertical Datum Table
| type | NAVD88 |
|---|---|
| major Flooding | 1246.48 ft |
| moderate Flooding | 1243.98 ft |
| minor Flooding | 1240.48 ft |
| action | 1237.98 ft |
| Latest Value | 1231.64 ft |
| Gauge Zero | 1223.98 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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