River stage
Last reported 2026-10-13 | NWS OTWI2
In brief
The Illinois River at Ottawa, IL read 458.69 ft on Oct 13, 2026, 2.31 ft below action stage.
Source: National Weather Service gauge OTWI2
| Rank | Crest | Date |
|---|---|---|
| 1 | 473.72 ft | 2013-04-19 |
| 2 | 472.59 ft | 2020-05-19 |
| 3 | 472.21 ft | 2008-09-16 |
| 4 | 471.49 ft | 2018-02-22 |
| 5 | 470.83 ft | 2019-05-02 |
| 6 | 470.23 ft | 2009-03-11 |
| 7 | 468.87 ft | 2008-12-29 |
| 8 | 468.06 ft | 2015-12-30 |
Flood crests recorded at this gauge by the National Weather Service.
River Rescue boat dock inundated in Ottawa.
Roadway entrance to Allen Park threatened in Ottawa. Allen Park west boat ramp inundated in Ottawa.
Backwater causes the Fox River to reach bankfull near St. Elizabeth Medical Center in Ottawa.
Harbor Walk in Heritage Harbor east of Ottawa is inundated.
Low-lying property near St. Elizabeth Medical Center is threatened. Marquette High School football field threatened.
Low-lying sections of Fox River Park in Ottawa are inundated including Hudson Street River Walk. St. Clair Street is threatened in Ottawa.
Green Street near Shoreline Boat Club in Ottawa is inundated, blocking a primary evacuation route for east Ottawa.
River Rescue structure threatened in Ottawa.
Backwater causes the Fox River to reach bankfull near the YMCA in Ottawa.
Shabbona Street near Ottawa High School is inundated. St. Elizabeth Medical Center property in Ottawa is threatened including the loading dock areas.
Written by the local National Weather Service forecast office for this exact gauge.
No. The Illinois River at Ottawa is at 458.69 ft, 2.31 ft below action stage.
The National Weather Service sets action stage 461 ft, minor flooding 463 ft, moderate flooding 467 ft and major flooding 471 ft.
The highest crest on record is 473.72 ft, on 2013-04-19.
Stage and flood information from the NOAA National Weather Service (gauge OTWI2). Last reading 2026-10-13. For flood safety decisions always follow official National Weather Service warnings.