Illinois River at Seneca

1. 36.00 ftBackwater causes Rat Run to threatened Main Street in Seneca.
2. 35.50 ftA few residences threatened near River Road and IL-170 in Seneca.
3. 35.00 ftRiver Road is threatened near IL-170 in Seneca.
4. 33.50 ftIndustrial structures are threatened along the river west of Seneca.
5. 33.00 ftBackwater causes Rat Run to threaten a few structures near Main Street in Seneca.
6. 32.00 ftIL-36 (Dupont Road) is threatened along the river near Seneca.
7. 31.50 ftOld Stage Road is threatened just east of Seneca.
8. 31.00 ftBackwater causes Rat Run to overtop its banks near Main Street in Seneca.
9. 28.00 ftOld Stage Road is threatened near the Illinois and Michigan Canal between Seneca and Morris. Agricultural land is inundated north of the river near Seneca.
10. 27.00 ftRoadways at numerous marinas threatened along the river near Seneca.
11. 25.00 ftWater overtops low-lying banks in Seneca.

Significant river flooding is possible here through September 26.

Weather conditions indicate that significant flooding could occur; it is neither certain nor imminent.

The five-day outlook is from the Weather Prediction Center with the River Forecast Centers.

Most recent crests

• May 19, 2020: 32.25 ft
• September 29, 2019: 27.94 ft
• May 2, 2019: 32.16 ft
• February 21, 2018: 30.78 ft
• May 2, 2017: 27.36 ft

• Illinois River at Marseilles
• Illinois River at Marseilles Lock (tailwater)
• Illinois River at Morris
• Fox River at Dayton
• Illinois River at Ottawa
• Mazon River at Coal City
• Aux Sable Creek at Morris
• Vermilion River (N-IL) at Leonore

Forecasts by the North Central River Forecast Center. Forecasts are not available. Only observed stages are available for this point.

Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.