Illinois River at Dresden Lock (tailwater)
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) 06/21/2025 5:00 AM CDTNormal Pool: 483.2 ftRecord: 506.4 ftLow Threshold: 481.2 ftCATEGORY STAGE 
Action 491 ft Reliability of the Forecast:
NOTE: Graphical forecasts are not available during times of high water, forecast crest information can be found in the local WFO web page.
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
- 505.4 - High water levels cause Dresden Lock to shut down.
- 494.5 - High water levels begin to impact shipping interests along the river.
Gauge Info
| Coordinates | 41.3981, -88.2792 |
| RFC | NCRFC |
| State | IL |
| WFO | LOT |
| County | Grundy |
| Data Provider(s) | |
| US Geological Survey | USGS--Water Resources of the United States |
Gauge Location
Recent Crests
| 1. | 506.44 ft | on 05-18-2020 |
| 2. | 505.70 ft | on 02-22-2018 |
| 3. | 495.02 ft | on 07-23-2017 |
| 4. | 494.10 ft | on 05-11-2017 |
| 5. | 498.89 ft | on 05-02-2017 |
Recent Crests
| 1. | 506.44 ft | on 05-18-2020 |
| 2. | 505.70 ft | on 02-22-2018 |
| 3. | 495.02 ft | on 07-23-2017 |
| 4. | 494.10 ft | on 05-11-2017 |
| 5. | 498.89 ft | on 05-02-2017 |
| 6. | 506.38 ft | on 04-19-2013 |
| 7. | 506.35 ft | on 09-15-2008 |
| 8. | 502.87 ft | on 08-25-2007 |
| 9. | 504.29 ft | on 02-22-1997 |
| 10. | 504.50 ft | on 11-29-1990 |
| 11. | 503.50 ft | on 02-24-1985 |
| 12. | 505.23 ft | on 12-04-1982 |
| 13. | 504.70 ft | on 07-14-1957 |
Historic Crests
| 1. | 506.44 ft | on 05-18-2020 |
| 2. | 506.38 ft | on 04-19-2013 |
| 3. | 506.35 ft | on 09-15-2008 |
| 4. | 505.70 ft | on 02-22-2018 |
| 5. | 505.23 ft | on 12-04-1982 |
Historic Crests
| 1. | 506.44 ft | on 05-18-2020 |
| 2. | 506.38 ft | on 04-19-2013 |
| 3. | 506.35 ft | on 09-15-2008 |
| 4. | 505.70 ft | on 02-22-2018 |
| 5. | 505.23 ft | on 12-04-1982 |
| 6. | 504.70 ft | on 07-14-1957 |
| 7. | 504.50 ft | on 11-29-1990 |
| 8. | 504.29 ft | on 02-22-1997 |
| 9. | 503.50 ft | on 02-24-1985 |
| 10. | 502.87 ft | on 08-25-2007 |
| 11. | 498.89 ft | on 05-02-2017 |
| 12. | 495.02 ft | on 07-23-2017 |
| 13. | 494.10 ft | on 05-11-2017 |
Low Water Records
Low Water Records
Vertical Datum Table
| type | NAVD88 |
|---|---|
| major Flooding | N/A |
| moderate Flooding | N/A |
| minor Flooding | N/A |
| action | 490.72 ft |
| Latest Value | 485.58 ft |
| Gauge Zero | -0.28 ft |
Gauge Photos
No Images Found
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.