Mississippi River at Mel Price (Alton) Lock and Dam
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) 06/13/2025 7:00 AM CDTOfficial Forecast (FCST) 06/12/2025 9:10 PM CDTRecord: 42.7 ftCATEGORY STAGE 
Major Flooding 34 ft Moderate Flooding 29 ft Minor Flooding 21 ft Action 19 ft Reliability of the Forecast:
NOTE: Forecasts are issued routinely year-round.
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.
For the latest navigation status update from the U.S. Army Corps of Engineers-St. Louis District, click here.
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
- 42.7 - This is the RECORD FLOOD LEVEL that was reached on August 1 1993.
- 42 - Near this height U.S. Highway 67 will be completely closed. (MoDOT)
- 40 - Railroad tracks from Wood River to Alton begin to flood.
Gauge Info
| Coordinates | 38.8664, -90.1464 |
| RFC | NCRFC |
| State | IL |
| WFO | LSX |
| County | Madison |
| Data Provider(s) | |
| U.S. Army Corps of Engineers | RiverGages.com |
Gauge Location
Recent Crests
| 1. | 23.62 ft | on 05-02-2024 |
| 2. | 23.17 ft | on 06-28-2021 |
| 3. | 22.90 ft | on 04-14-2021 |
| 4. | 25.04 ft | on 03-20-2021 |
| 5. | 25.14 ft | on 06-01-2020 |
Recent Crests
| 1. | 23.62 ft | on 05-02-2024 | |
| 2. | 23.17 ft | on 06-28-2021 | |
| 3. | 22.90 ft | on 04-14-2021 | |
| 4. | 25.04 ft | on 03-20-2021 | |
| 5. | 25.14 ft | on 06-01-2020 | |
| 6. | 22.16 ft | on 05-19-2020 | |
| 7. | 22.32 ft | on 04-30-2020 | |
| 8. | 23.72 ft | on 03-25-2020 | |
| 9. | 23.33 ft | on 01-13-2020 | |
| 10. | 21.55 ft | on 11-02-2019 | |
| 11. | 21.17 ft | on 11-01-2019 | |
| 12. | 25.35 ft | on 10-12-2019 | |
| 13. | 39.01 ft | on 06-09-2019 | |
| 14. | 26.78 ft | on 10-16-2018 | |
| 15. | 34.86 ft | on 05-06-2017 | |
| 16. | 22.67 ft | on 04-09-2017 | |
| 17. | 22.48 ft | on 01-12-2016 | |
| 18. | 35.80 ft | on 01-01-2016 | |
| 19. | 24.01 ft | on 12-19-2015 | |
| 20. | 32.27 ft | on 06-30-2015 | |
| 21. | 25.84 ft | on 07-11-2014 | |
| 22. | 34.38 ft | on 06-04-2013 | |
| 23. | 21.54 ft | on 05-23-2013 | |
| 24. | 30.62 ft | on 04-25-2013 | |
| 25. | 27.29 ft | on 06-20-2011 | |
| 26. | 22.17 ft | on 05-24-2011 | |
| 27. | 28.28 ft | on 04-30-2011 | |
| 28. | 21.09 ft | on 08-23-2010 | |
| 29. | 21.24 ft | on 08-17-2010 | |
| 30. | 29.05 ft | on 06-28-2010 | |
| 31. | 28.19 ft | on 05-19-2010 | |
| 32. | 24.03 ft | on 04-28-2010 | |
| 33. | 26.61 ft | on 03-29-2010 | |
| 34. | 21.02 ft | on 01-27-2010 | |
| 35. | 22.70 ft | on 11-21-2009 | |
| 36. | 26.31 ft | on 11-02-2009 | |
| 37. | 21.55 ft | on 06-20-2009 | |
| 38. | 27.24 ft | on 05-21-2009 | |
| 39. | 21.73 ft | on 04-01-2009 | |
| 40. | 22.66 ft | on 03-16-2009 | |
| 41. | 29.89 ft | on 09-18-2008 | |
| 42. | 24.06 ft | on 08-01-2008 | |
| 43. | 33.08 ft | on 06-30-2008 | |
| 44. | 21.02 ft | on 05-28-2008 | |
| 45. | 24.88 ft | on 05-10-2008 | |
| 46. | 25.38 ft | on 04-13-2008 | |
| 47. | 24.44 ft | on 03-21-2008 | |
| 48. | 22.76 ft | on 05-11-2007 | |
| 49. | 22.58 ft | on 01-06-2005 | |
| 50. | 22.16 ft | on 05-29-2004 | |
| 51. | 28.90 ft | on 06-09-2001 | |
| 52. | 25.91 ft | on 05-21-2001 | |
| 53. | 21.50 ft | on 03-19-2001 | |
| 54. | 28.10 ft | on 04-18-1998 | |
| 55. | 25.70 ft | on 04-20-1997 | |
| 56. | 26.70 ft | on 03-01-1997 | |
| 57. | 35.10 ft | on 05-22-1995 | |
| 58. | 42.72 ft | on 08-01-1993 | |
| 59. | 30.80 ft | on 04-18-1993 | |
| 60. | 34.20 ft | on 10-09-1986 | |
| 61. | 25.90 ft | on 05-23-1986 | |
| 62. | 27.70 ft | on 11-22-1985 | |
| 63. | 29.60 ft | on 03-08-1985 | |
| 64. | 24.30 ft | on 06-28-1984 | |
| 65. | 28.10 ft | on 04-25-1984 | |
| 66. | 33.21 ft | on 05-01-1983 | |
| 67. | 32.44 ft | on 12-08-1982 | |
| 68. | 26.20 ft | on 06-12-1982 | |
| 69. | 25.60 ft | on 03-24-1982 | |
| 70. | 24.90 ft | on 07-30-1981 | |
| 71. | 36.89 ft | on 04-28-1973 | |
| 72. | 36.90 ft | on 06-18-1844 | 1 |
Historic Crests
| 1. | 42.72 ft | on 08-01-1993 | |
| 2. | 39.01 ft | on 06-09-2019 | |
| 3. | 36.90 ft | on 06-18-1844 | 1 |
| 4. | 36.89 ft | on 04-28-1973 | |
| 5. | 35.80 ft | on 01-01-2016 |
Historic Crests
| 1. | 42.72 ft | on 08-01-1993 | |
| 2. | 39.01 ft | on 06-09-2019 | |
| 3. | 36.90 ft | on 06-18-1844 | 1 |
| 4. | 36.89 ft | on 04-28-1973 | |
| 5. | 35.80 ft | on 01-01-2016 | |
| 6. | 35.10 ft | on 05-22-1995 | |
| 7. | 34.86 ft | on 05-06-2017 | |
| 8. | 34.38 ft | on 06-04-2013 | |
| 9. | 34.20 ft | on 10-09-1986 | |
| 10. | 33.21 ft | on 05-01-1983 | |
| 11. | 33.08 ft | on 06-30-2008 | |
| 12. | 32.44 ft | on 12-08-1982 | |
| 13. | 32.27 ft | on 06-30-2015 | |
| 14. | 30.80 ft | on 04-18-1993 | |
| 15. | 30.62 ft | on 04-25-2013 | |
| 16. | 29.89 ft | on 09-18-2008 | |
| 17. | 29.60 ft | on 03-08-1985 | |
| 18. | 29.05 ft | on 06-28-2010 | |
| 19. | 28.90 ft | on 06-09-2001 | |
| 20. | 28.28 ft | on 04-30-2011 | |
| 21. | 28.19 ft | on 05-19-2010 | |
| 22. | 28.10 ft | on 04-25-1984 | |
| 23. | 28.10 ft | on 04-18-1998 | |
| 24. | 27.70 ft | on 11-22-1985 | |
| 25. | 27.29 ft | on 06-20-2011 | |
| 26. | 27.24 ft | on 05-21-2009 | |
| 27. | 26.78 ft | on 10-16-2018 | |
| 28. | 26.70 ft | on 03-01-1997 | |
| 29. | 26.61 ft | on 03-29-2010 | |
| 30. | 26.31 ft | on 11-02-2009 | |
| 31. | 26.20 ft | on 06-12-1982 | |
| 32. | 25.91 ft | on 05-21-2001 | |
| 33. | 25.90 ft | on 05-23-1986 | |
| 34. | 25.84 ft | on 07-11-2014 | |
| 35. | 25.70 ft | on 04-20-1997 | |
| 36. | 25.60 ft | on 03-24-1982 | |
| 37. | 25.38 ft | on 04-13-2008 | |
| 38. | 25.35 ft | on 10-12-2019 | |
| 39. | 25.14 ft | on 06-01-2020 | |
| 40. | 25.04 ft | on 03-20-2021 | |
| 41. | 24.90 ft | on 07-30-1981 | |
| 42. | 24.88 ft | on 05-10-2008 | |
| 43. | 24.44 ft | on 03-21-2008 | |
| 44. | 24.30 ft | on 06-28-1984 | |
| 45. | 24.06 ft | on 08-01-2008 | |
| 46. | 24.03 ft | on 04-28-2010 | |
| 47. | 24.01 ft | on 12-19-2015 | |
| 48. | 23.72 ft | on 03-25-2020 | |
| 49. | 23.62 ft | on 05-02-2024 | |
| 50. | 23.33 ft | on 01-13-2020 | |
| 51. | 23.17 ft | on 06-28-2021 | |
| 52. | 22.90 ft | on 04-14-2021 | |
| 53. | 22.76 ft | on 05-11-2007 | |
| 54. | 22.70 ft | on 11-21-2009 | |
| 55. | 22.67 ft | on 04-09-2017 | |
| 56. | 22.66 ft | on 03-16-2009 | |
| 57. | 22.58 ft | on 01-06-2005 | |
| 58. | 22.48 ft | on 01-12-2016 | |
| 59. | 22.32 ft | on 04-30-2020 | |
| 60. | 22.17 ft | on 05-24-2011 | |
| 61. | 22.16 ft | on 05-29-2004 | |
| 62. | 22.16 ft | on 05-19-2020 | |
| 63. | 21.73 ft | on 04-01-2009 | |
| 64. | 21.55 ft | on 06-20-2009 | |
| 65. | 21.55 ft | on 11-02-2019 | |
| 66. | 21.54 ft | on 05-23-2013 | |
| 67. | 21.50 ft | on 03-19-2001 | |
| 68. | 21.24 ft | on 08-17-2010 | |
| 69. | 21.17 ft | on 11-01-2019 | |
| 70. | 21.09 ft | on 08-23-2010 | |
| 71. | 21.02 ft | on 01-27-2010 | |
| 72. | 21.02 ft | on 05-28-2008 |
Vertical Datum Table
| type | NAVD88 |
|---|---|
| major Flooding | 429.04 ft |
| moderate Flooding | 424.04 ft |
| minor Flooding | 416.04 ft |
| action | 414.04 ft |
| Latest Value | 405.97 ft |
| Gauge Zero | 395.04 ft |
Unique Local Info
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
Additional Resource Links
WFO Information
Weather Forecast Office
St. Louis
12 Missouri Research Park Drive
St. Charles, MO 63304
Official Homepage