Mississippi River at Alton
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.No secondary data available. Transformations for Flow data and a secondary Y axis cannot be made at this time.
Traces and Thresholds Click to turn on/off display
Observed (OBS) 06/16/2025 5:30 AM CDTRecord: 39.5 ftCATEGORY STAGE 
Major Flooding 31 ft Moderate Flooding 24 ft Minor Flooding 21 ft Action 20 ft Reliability of the Forecast: Based on current and forecast river, weather and reservoir conditions
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 precipitation and the precipitation amounts expected approximately 24 hours into the future from the forecast issuance time.
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
- 39 - Near this height, floodwaters will reach the floor of the Lincoln Shields gazebo in West Alton, Missouri.
- 38.7 - Near this height U.S. Highway 67 will be completely closed.
- 36.7 - The railroad between Wood River and Alton begins flooding near this height.
Gauge Info
| Coordinates | 38.8872, -90.1839 |
| RFC | NCRFC |
| State | IL |
| WFO | LSX |
| County | Madison |
| Data Provider(s) | |
| U.S. Geological Survey | USGS--Water Resources of the United States |
| USGS | 05587498 |
| U.S. Army Corps of Engineers | St. Louis District observations |
Gauge Location
Recent Crests
| 1. | 21.70 ft | on 03-20-2021 |
| 2. | 21.69 ft | on 06-01-2020 |
| 3. | 20.30 ft | on 03-29-2020 |
| 4. | 21.86 ft | on 10-13-2019 |
| 5. | 35.30 ft | on 06-09-2019 |
Recent Crests
| 1. | 21.70 ft | on 03-20-2021 |
| 2. | 21.69 ft | on 06-01-2020 |
| 3. | 20.30 ft | on 03-29-2020 |
| 4. | 21.86 ft | on 10-13-2019 |
| 5. | 35.30 ft | on 06-09-2019 |
| 6. | 31.60 ft | on 05-07-2019 |
| 7. | 28.77 ft | on 04-03-2019 |
| 8. | 23.71 ft | on 10-17-2018 |
| 9. | 31.02 ft | on 05-06-2017 |
| 10. | 31.94 ft | on 01-01-2016 |
| 11. | 29.11 ft | on 06-30-2015 |
| 12. | 23.02 ft | on 07-11-2014 |
| 13. | 31.27 ft | on 06-04-2013 |
| 14. | 28.04 ft | on 04-25-2013 |
| 15. | 24.45 ft | on 06-20-2011 |
| 16. | 22.99 ft | on 06-07-2011 |
| 17. | 25.06 ft | on 04-30-2011 |
| 18. | 23.07 ft | on 07-24-2010 |
| 19. | 26.01 ft | on 06-28-2010 |
| 20. | 24.49 ft | on 05-19-2010 |
| 21. | 23.36 ft | on 03-30-2010 |
| 22. | 22.87 ft | on 11-02-2009 |
| 23. | 23.87 ft | on 05-21-2009 |
| 24. | 22.78 ft | on 05-04-2009 |
| 25. | 25.95 ft | on 09-19-2008 |
| 26. | 29.78 ft | on 06-29-2008 |
| 27. | 21.67 ft | on 04-28-2008 |
| 28. | 21.67 ft | on 04-13-2008 |
| 29. | 20.00 ft | on 12-28-2005 |
| 30. | 28.27 ft | on 04-17-2002 |
| 31. | 24.99 ft | on 06-09-2001 |
| 32. | 23.36 ft | on 05-02-1999 |
| 33. | 24.74 ft | on 04-17-1998 |
| 34. | 23.26 ft | on 03-01-1997 |
| 35. | 26.46 ft | on 06-02-1996 |
| 36. | 31.43 ft | on 05-22-1995 |
| 37. | 24.78 ft | on 04-14-1994 |
| 38. | 39.55 ft | on 08-01-1993 |
Historic Crests
| 1. | 39.55 ft | on 08-01-1993 |
| 2. | 35.30 ft | on 06-09-2019 |
| 3. | 31.94 ft | on 01-01-2016 |
| 4. | 31.60 ft | on 05-07-2019 |
| 5. | 31.43 ft | on 05-22-1995 |
Historic Crests
| 1. | 39.55 ft | on 08-01-1993 |
| 2. | 35.30 ft | on 06-09-2019 |
| 3. | 31.94 ft | on 01-01-2016 |
| 4. | 31.60 ft | on 05-07-2019 |
| 5. | 31.43 ft | on 05-22-1995 |
| 6. | 31.27 ft | on 06-04-2013 |
| 7. | 31.02 ft | on 05-06-2017 |
| 8. | 29.78 ft | on 06-29-2008 |
| 9. | 29.11 ft | on 06-30-2015 |
| 10. | 28.77 ft | on 04-03-2019 |
| 11. | 28.27 ft | on 04-17-2002 |
| 12. | 28.04 ft | on 04-25-2013 |
| 13. | 26.46 ft | on 06-02-1996 |
| 14. | 26.01 ft | on 06-28-2010 |
| 15. | 25.95 ft | on 09-19-2008 |
| 16. | 25.06 ft | on 04-30-2011 |
| 17. | 24.99 ft | on 06-09-2001 |
| 18. | 24.78 ft | on 04-14-1994 |
| 19. | 24.74 ft | on 04-17-1998 |
| 20. | 24.49 ft | on 05-19-2010 |
| 21. | 24.45 ft | on 06-20-2011 |
| 22. | 23.87 ft | on 05-21-2009 |
| 23. | 23.71 ft | on 10-17-2018 |
| 24. | 23.36 ft | on 03-30-2010 |
| 25. | 23.36 ft | on 05-02-1999 |
| 26. | 23.26 ft | on 03-01-1997 |
| 27. | 23.07 ft | on 07-24-2010 |
| 28. | 23.02 ft | on 07-11-2014 |
| 29. | 22.99 ft | on 06-07-2011 |
| 30. | 22.87 ft | on 11-02-2009 |
| 31. | 22.78 ft | on 05-04-2009 |
| 32. | 21.86 ft | on 10-13-2019 |
| 33. | 21.70 ft | on 03-20-2021 |
| 34. | 21.69 ft | on 06-01-2020 |
| 35. | 21.67 ft | on 04-28-2008 |
| 36. | 21.67 ft | on 04-13-2008 |
| 37. | 20.30 ft | on 03-29-2020 |
| 38. | 20.00 ft | on 12-28-2005 |
Vertical Datum Table
| type | NAVD88 |
|---|---|
| major Flooding | 430.66 ft |
| moderate Flooding | 423.66 ft |
| minor Flooding | 420.66 ft |
| action | 419.66 ft |
| Latest Value | 417.01 ft |
| Gauge Zero | 399.66 ft |
Probability Information
No Images Available
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.