Floyd River at Alton
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
CATEGORY STAGE Major Flooding 22 ft Moderate Flooding 16 ft Minor Flooding 12 ft Action 10 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
- 26 - Hwy 10 is flooded and substantial flooding is ongoing near the river throughout Alton.
- 24 - Several houses on the north side of Alton flood. Hwy 60 south of Alton floods and water approaches Hwy 10 on the north side of Alton. The railroad tracks are also flooded.
- 22 - More substantial street flooding begins in Alton including 3rd Ave south of the bridge. Additional structures are also in danger of flooding.
- 20 - The lower levees in Alton may begin to be overtopped flooding some nearby industrial businesses. Portions of Division St may also begin to flood. The bridge on 3rd Ave may also be closed.
- 18 - The entire flood plain is under water and the river is about 1/2 mile wide. The flooding still primarily only affects agricultural land and county roads.
Gauge Location
Recent Crests
| 1. | 26.81 ft | on 06-22-2024 |
| 2. | 9.09 ft | on 05-13-2023 |
| 3. | 6.43 ft | on 06-25-2022 |
| 4. | 6.16 ft | on 07-14-2021 |
| 5. | 8.82 ft | on 05-27-2020 |
Recent Crests
| 1. | 26.81 ft | on 06-22-2024 |
| 2. | 9.09 ft | on 05-13-2023 |
| 3. | 6.43 ft | on 06-25-2022 |
| 4. | 6.16 ft | on 07-14-2021 |
| 5. | 8.82 ft | on 05-27-2020 |
| 6. | 20.87 ft | on 03-14-2019 |
| 7. | 21.96 ft | on 09-20-2018 |
| 8. | 20.50 ft | on 06-21-2018 |
| 9. | 11.07 ft | on 09-18-2016 |
| 10. | 6.24 ft | on 05-17-2015 |
| 11. | 18.04 ft | on 06-18-2014 |
| 12. | 19.19 ft | on 05-27-2013 |
| 13. | 11.26 ft | on 03-08-2012 |
| 14. | 13.54 ft | on 02-19-2011 |
| 15. | 17.97 ft | on 07-23-2010 |
| 16. | 14.17 ft | on 02-11-2009 |
| 17. | 12.07 ft | on 06-13-2008 |
| 18. | 10.34 ft | on 05-02-2006 |
| 19. | 9.98 ft | on 05-14-2005 |
| 20. | 12.15 ft | on 03-02-2004 |
| 21. | 11.86 ft | on 07-09-2003 |
| 22. | 7.42 ft | on 06-12-2002 |
| 23. | 12.84 ft | on 04-23-2001 |
| 24. | 6.83 ft | on 06-15-2000 |
| 25. | 8.34 ft | on 06-10-1999 |
| 26. | 7.48 ft | on 04-16-1998 |
| 27. | 15.66 ft | on 03-13-1997 |
| 28. | 12.50 ft | on 06-22-1996 |
| 29. | 15.05 ft | on 08-08-1995 |
| 30. | 17.34 ft | on 06-13-1994 |
| 31. | 17.46 ft | on 03-28-1993 |
| 32. | 10.94 ft | on 07-10-1992 |
| 33. | 7.71 ft | on 04-14-1991 |
| 34. | 14.05 ft | on 06-28-1990 |
| 35. | 9.76 ft | on 03-10-1989 |
| 36. | 10.46 ft | on 03-02-1988 |
| 37. | 12.35 ft | on 03-24-1987 |
| 38. | 14.38 ft | on 03-19-1986 |
| 39. | 16.93 ft | on 04-23-1985 |
| 40. | 16.58 ft | on 06-13-1984 |
| 41. | 18.54 ft | on 06-20-1983 |
| 42. | 16.39 ft | on 07-06-1982 |
| 43. | 14.17 ft | on 06-15-1981 |
| 44. | 12.68 ft | on 06-06-1980 |
| 45. | 18.40 ft | on 03-23-1979 |
| 46. | 13.37 ft | on 03-19-1978 |
| 47. | 7.46 ft | on 07-24-1977 |
| 48. | 9.16 ft | on 03-16-1976 |
| 49. | 16.55 ft | on 06-05-1975 |
| 50. | 14.00 ft | on 06-22-1974 |
| 51. | 15.95 ft | on 03-03-1973 |
| 52. | 15.59 ft | on 03-12-1972 |
| 53. | 17.17 ft | on 02-19-1971 |
| 54. | 15.47 ft | on 03-03-1970 |
| 55. | 17.78 ft | on 03-04-1969 |
| 56. | 8.61 ft | on 07-20-1968 |
| 57. | 13.75 ft | on 06-16-1967 |
| 58. | 16.62 ft | on 02-09-1966 |
| 59. | 17.36 ft | on 04-01-1965 |
| 60. | 10.89 ft | on 07-11-1964 |
| 61. | 8.80 ft | on 03-17-1963 |
| 62. | 18.35 ft | on 03-28-1962 |
| 63. | 15.73 ft | on 03-03-1961 |
| 64. | 17.27 ft | on 03-28-1960 |
| 65. | 12.77 ft | on 06-01-1959 |
| 66. | 9.82 ft | on 06-03-1958 |
| 67. | 10.54 ft | on 07-04-1957 |
| 68. | 9.45 ft | on 07-11-1956 |
Historic Crests
| 1. | 26.81 ft | on 06-22-2024 |
| 2. | 21.96 ft | on 09-20-2018 |
| 3. | 20.87 ft | on 03-14-2019 |
| 4. | 20.50 ft | on 06-21-2018 |
| 5. | 19.19 ft | on 05-27-2013 |
Historic Crests
| 1. | 26.81 ft | on 06-22-2024 |
| 2. | 21.96 ft | on 09-20-2018 |
| 3. | 20.87 ft | on 03-14-2019 |
| 4. | 20.50 ft | on 06-21-2018 |
| 5. | 19.19 ft | on 05-27-2013 |
| 6. | 18.54 ft | on 06-20-1983 |
| 7. | 18.40 ft | on 03-23-1979 |
| 8. | 18.35 ft | on 03-28-1962 |
| 9. | 18.04 ft | on 06-18-2014 |
| 10. | 17.97 ft | on 07-23-2010 |
| 11. | 17.78 ft | on 03-04-1969 |
| 12. | 17.46 ft | on 03-28-1993 |
| 13. | 17.36 ft | on 04-01-1965 |
| 14. | 17.34 ft | on 06-13-1994 |
| 15. | 17.27 ft | on 03-28-1960 |
| 16. | 17.17 ft | on 02-19-1971 |
| 17. | 16.93 ft | on 04-23-1985 |
| 18. | 16.62 ft | on 02-09-1966 |
| 19. | 16.58 ft | on 06-13-1984 |
| 20. | 16.55 ft | on 06-05-1975 |
| 21. | 16.39 ft | on 07-06-1982 |
| 22. | 15.95 ft | on 03-03-1973 |
| 23. | 15.73 ft | on 03-03-1961 |
| 24. | 15.66 ft | on 03-13-1997 |
| 25. | 15.59 ft | on 03-12-1972 |
| 26. | 15.47 ft | on 03-03-1970 |
| 27. | 15.05 ft | on 08-08-1995 |
| 28. | 14.38 ft | on 03-19-1986 |
| 29. | 14.17 ft | on 02-11-2009 |
| 30. | 14.17 ft | on 06-15-1981 |
| 31. | 14.05 ft | on 06-28-1990 |
| 32. | 14.00 ft | on 06-22-1974 |
| 33. | 13.75 ft | on 06-16-1967 |
| 34. | 13.54 ft | on 02-19-2011 |
| 35. | 13.37 ft | on 03-19-1978 |
| 36. | 12.84 ft | on 04-23-2001 |
| 37. | 12.77 ft | on 06-01-1959 |
| 38. | 12.68 ft | on 06-06-1980 |
| 39. | 12.50 ft | on 06-22-1996 |
| 40. | 12.35 ft | on 03-24-1987 |
| 41. | 12.15 ft | on 03-02-2004 |
| 42. | 12.07 ft | on 06-13-2008 |
| 43. | 11.86 ft | on 07-09-2003 |
| 44. | 11.26 ft | on 03-08-2012 |
| 45. | 11.07 ft | on 09-18-2016 |
| 46. | 10.94 ft | on 07-10-1992 |
| 47. | 10.89 ft | on 07-11-1964 |
| 48. | 10.54 ft | on 07-04-1957 |
| 49. | 10.46 ft | on 03-02-1988 |
| 50. | 10.34 ft | on 05-02-2006 |
| 51. | 9.98 ft | on 05-14-2005 |
| 52. | 9.82 ft | on 06-03-1958 |
| 53. | 9.76 ft | on 03-10-1989 |
| 54. | 9.45 ft | on 07-11-1956 |
| 55. | 9.16 ft | on 03-16-1976 |
| 56. | 9.09 ft | on 05-13-2023 |
| 57. | 8.82 ft | on 05-27-2020 |
| 58. | 8.80 ft | on 03-17-1963 |
| 59. | 8.61 ft | on 07-20-1968 |
| 60. | 8.34 ft | on 06-10-1999 |
| 61. | 7.71 ft | on 04-14-1991 |
| 62. | 7.48 ft | on 04-16-1998 |
| 63. | 7.46 ft | on 07-24-1977 |
| 64. | 7.42 ft | on 06-12-2002 |
| 65. | 6.83 ft | on 06-15-2000 |
| 66. | 6.43 ft | on 06-25-2022 |
| 67. | 6.24 ft | on 05-17-2015 |
| 68. | 6.16 ft | on 07-14-2021 |
Vertical Datum Table
| type | NAVD88 |
|---|---|
| major Flooding | 1292.17 ft |
| moderate Flooding | 1286.17 ft |
| minor Flooding | 1282.17 ft |
| action | 1280.17 ft |
| Latest Value | 1276.33 ft |
| Gauge Zero | 1270.17 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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