Illinois River at LaGrange Lock and Dam
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
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- Warning: no valid ratings curve available. Transformations to and from FEET/CFS/KCFS will not happen.
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Observed (OBS) 06/11/2025 10:00 PM CDTOfficial Forecast (FCST) 06/11/2025 10:42 AM CDTRecord: 34.7 ftCATEGORY STAGE 
Major Flooding 29 ft Moderate Flooding 27 ft Minor Flooding 23 ft Action 21 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.
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
- 36 - Lockmasters house and the lower Corps building at the lock and dam begin flooding.
- 35.5 - LaGrange Road (County Highway 12) is flooded south of LaGrange Lock and Dam.
- 29.5 - La Grange Lock Road (County Road 1730N) is flooded just north of the Lock and Dam.
Gauge Location
Recent Crests
| 1. | 24.06 ft | on 02-05-2024 |
| 2. | 24.27 ft | on 07-07-2021 |
| 3. | 31.35 ft | on 05-27-2020 |
| 4. | 23.62 ft | on 01-24-2020 |
| 5. | 33.89 ft | on 06-04-2019 |
Recent Crests
| 1. | 24.06 ft | on 02-05-2024 |
| 2. | 24.27 ft | on 07-07-2021 |
| 3. | 31.35 ft | on 05-27-2020 |
| 4. | 23.62 ft | on 01-24-2020 |
| 5. | 33.89 ft | on 06-04-2019 |
| 6. | 24.88 ft | on 04-01-2019 |
| 7. | 23.16 ft | on 02-28-2019 |
| 8. | 23.93 ft | on 02-17-2019 |
| 9. | 26.04 ft | on 03-07-2018 |
| 10. | 29.75 ft | on 05-08-2017 |
| 11. | 24.78 ft | on 04-14-2017 |
| 12. | 34.66 ft | on 07-02-2015 |
| 13. | 31.15 ft | on 06-06-2013 |
| 14. | 34.50 ft | on 04-27-2013 |
| 15. | 27.86 ft | on 06-28-2011 |
| 16. | 27.47 ft | on 05-04-2011 |
| 17. | 30.42 ft | on 06-29-2010 |
| 18. | 25.39 ft | on 05-23-2010 |
| 19. | 24.83 ft | on 03-22-2010 |
| 20. | 23.34 ft | on 01-30-2010 |
| 21. | 25.57 ft | on 01-02-2010 |
| 22. | 27.65 ft | on 11-06-2009 |
| 23. | 32.00 ft | on 05-22-2009 |
| 24. | 29.72 ft | on 03-19-2009 |
| 25. | 26.58 ft | on 01-06-2009 |
| 26. | 29.35 ft | on 09-24-2008 |
| 27. | 25.22 ft | on 06-16-2008 |
| 28. | 25.72 ft | on 02-23-2008 |
| 29. | 23.60 ft | on 01-19-2008 |
| 30. | 25.30 ft | on 04-04-2007 |
| 31. | 23.75 ft | on 03-08-2007 |
| 32. | 29.44 ft | on 01-20-2005 |
| 33. | 23.03 ft | on 12-13-2004 |
| 34. | 33.34 ft | on 05-20-2002 |
| 35. | 26.10 ft | on 06-02-2001 |
| 36. | 26.40 ft | on 03-03-2001 |
| 37. | 34.02 ft | on 06-01-1995 |
| 38. | 32.00 ft | on 07-29-1993 |
| 39. | 30.00 ft | on 04-23-1993 |
| 40. | 32.80 ft | on 04-19-1979 |
| 41. | 32.00 ft | on 04-29-1973 |
Historic Crests
| 1. | 34.66 ft | on 07-02-2015 |
| 2. | 34.50 ft | on 04-27-2013 |
| 3. | 34.02 ft | on 06-01-1995 |
| 4. | 33.89 ft | on 06-04-2019 |
| 5. | 33.34 ft | on 05-20-2002 |
Historic Crests
| 1. | 34.66 ft | on 07-02-2015 |
| 2. | 34.50 ft | on 04-27-2013 |
| 3. | 34.02 ft | on 06-01-1995 |
| 4. | 33.89 ft | on 06-04-2019 |
| 5. | 33.34 ft | on 05-20-2002 |
| 6. | 32.80 ft | on 04-19-1979 |
| 7. | 32.00 ft | on 04-29-1973 |
| 8. | 32.00 ft | on 07-29-1993 |
| 9. | 32.00 ft | on 05-22-2009 |
| 10. | 31.35 ft | on 05-27-2020 |
| 11. | 31.15 ft | on 06-06-2013 |
| 12. | 30.42 ft | on 06-29-2010 |
| 13. | 30.00 ft | on 04-23-1993 |
| 14. | 29.75 ft | on 05-08-2017 |
| 15. | 29.72 ft | on 03-19-2009 |
| 16. | 29.44 ft | on 01-20-2005 |
| 17. | 29.35 ft | on 09-24-2008 |
| 18. | 27.86 ft | on 06-28-2011 |
| 19. | 27.65 ft | on 11-06-2009 |
| 20. | 27.47 ft | on 05-04-2011 |
| 21. | 26.58 ft | on 01-06-2009 |
| 22. | 26.40 ft | on 03-03-2001 |
| 23. | 26.10 ft | on 06-02-2001 |
| 24. | 26.04 ft | on 03-07-2018 |
| 25. | 25.72 ft | on 02-23-2008 |
| 26. | 25.57 ft | on 01-02-2010 |
| 27. | 25.39 ft | on 05-23-2010 |
| 28. | 25.30 ft | on 04-04-2007 |
| 29. | 25.22 ft | on 06-16-2008 |
| 30. | 24.88 ft | on 04-01-2019 |
| 31. | 24.83 ft | on 03-22-2010 |
| 32. | 24.78 ft | on 04-14-2017 |
| 33. | 24.27 ft | on 07-07-2021 |
| 34. | 24.06 ft | on 02-05-2024 |
| 35. | 23.93 ft | on 02-17-2019 |
| 36. | 23.75 ft | on 03-08-2007 |
| 37. | 23.62 ft | on 01-24-2020 |
| 38. | 23.60 ft | on 01-19-2008 |
| 39. | 23.34 ft | on 01-30-2010 |
| 40. | 23.16 ft | on 02-28-2019 |
| 41. | 23.03 ft | on 12-13-2004 |
Vertical Datum Table
| type | NGVD29 |
|---|---|
| major Flooding | 442.50 ft |
| moderate Flooding | 440.50 ft |
| minor Flooding | 436.50 ft |
| action | 434.50 ft |
| Latest Value | 428.01 ft |
| Gauge Zero | 413.50 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.