Illinois River at Seneca
La Salle County, Illinois
The past week
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What floods at each level
- 36 ft
Backwater causes Rat Run to threatened Main Street in Seneca.
- 35.5 ft
A few residences threatened near River Road and IL-170 in Seneca.
- 35 ft
River Road is threatened near IL-170 in Seneca.
- 33.5 ft
Industrial structures are threatened along the river west of Seneca.
- 33 ft
Backwater causes Rat Run to threaten a few structures near Main Street in Seneca.
- 32 ft
IL-36 (Dupont Road) is threatened along the river near Seneca.
- 31.5 ft
Old Stage Road is threatened just east of Seneca.
- 31 ft
Backwater causes Rat Run to overtop its banks near Main Street in Seneca.
- 28 ft
Old Stage Road is threatened near the Illinois and Michigan Canal between Seneca and Morris. Agricultural land is inundated north of the river near Seneca.
- 27 ft
Roadways at numerous marinas threatened along the river near Seneca.
- 25 ft
Water overtops low-lying banks in Seneca.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| May 18, 2020 | 32.25 ft | — |
| May 1, 2019 | 32.16 ft | — |
| Feb 20, 2018 | 30.78 ft | — |
When the water runs low
- 18.6
Low water levels begin to impact shipping interests along the river.
More on Illinois River
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