Illinois River at Ottawa
La Salle County, Illinois
The past week
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What floods at each level
- 476 ft
Water reaches the top of the levee at Ottawa High School.
- 475.5 ft
Backwater causes the Fox River to reach the top of the flood protection wall south of Main Street near Ottawa High School. Water inundates lower-level of residences at Heritage Harbor east of Ottawa.
- 474.5 ft
Backwater causes the Fox River to reach the top of the levee at Ottawa High School.
- 474 ft
Structures threatened at Shoreline Boat Club in Ottawa. Main Street at Fox River in Ottawa is threatened and may be closed, blocking the last primary evacuation route for east Ottawa. Water overtops the berm at Waste Water Treatment Plant.
- 472 ft
West parking lot of St. Elizabeth Medical Center in Ottawa is inundated.
- 471.5 ft
Water reaches top of levee at Ottawa Waste Water Treatment Plant. Backwater causes the Fox River to inundate the YMCA parking lot in Ottawa.
- 470 ft
Shabbona Street near Ottawa High School is inundated. St. Elizabeth Medical Center property in Ottawa is threatened including the loading dock areas.
- 469 ft
Backwater causes the Fox River to reach bankfull near the YMCA in Ottawa.
- 468 ft
River Rescue structure threatened in Ottawa.
- 467 ft
Green Street near Shoreline Boat Club in Ottawa is inundated, blocking a primary evacuation route for east Ottawa.
- 466.5 ft
Low-lying sections of Fox River Park in Ottawa are inundated including Hudson Street River Walk. St. Clair Street is threatened in Ottawa.
- 465.5 ft
Low-lying property near St. Elizabeth Medical Center is threatened. Marquette High School football field threatened.
- 465 ft
Harbor Walk in Heritage Harbor east of Ottawa is inundated.
- 464 ft
Backwater causes the Fox River to reach bankfull near St. Elizabeth Medical Center in Ottawa.
- 462.5 ft
Roadway entrance to Allen Park threatened in Ottawa. Allen Park west boat ramp inundated in Ottawa.
- 461 ft
River Rescue boat dock inundated in Ottawa.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| Apr 18, 2013 | 473.72 ft | — |
| May 18, 2020 | 472.59 ft | — |
| Sep 15, 2008 | 472.21 ft | — |
When the water runs low
- 456.5
Low water levels begin to impact shipping interests along the river.
Flood map
See which streets and areas flood at each water level here. Open the flood map ↗
More on Illinois River
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