Illinois River at Peoria

1. 35.20 ftKomatsu levee overtops.
2. 30.60 ftThe Peoria Sanitary District Levee overtopped at 30.6 feet.
3. 30.00 ftWater overtops the levee at the Pekin sewage treatment plant.
4. 29.00 ftWater overtops Pekin and LaMarsh levee at the railroad crossing. Constitution Avenue becomes inundated.
5. 28.70 ftFour blocks of Water Street in Peoria are inundated.
6. 28.50 ftWater reaches the lowest door sill elevations in the 300 block of SW Water Street in Peoria.
7. 28.00 ftEntire Length of Lake Street in Spring Bay is inundated. Water crosses Sunset Drive near Spring Beach Road.
8. 27.50 ftWater begins to flood the 100 block of NE Water Street in Peoria.
9. 27.00 ftWater begins to flood the 300 block of SW Water Street in Peoria. Water begins to impact homes on Millpoint Road and Sunset Drive in the Spring Bay Township.
10. 26.50 ftSeveral houses in Rome and Chillicothe become isolated. Homes on Sunset Drive between North Avenue and Collins Avenue...4 miles SSW of Bay View Gardens...are surrounded by water. In Spring Bay...North Lake Street from Missouri Street to Zimmerman Road is flooded.
11. 26.40 ftWater reaches the lowest door sill elevation of Peoria's historic River Station building on Water Street.
12. 26.00 ftWater inundates road by the railroad track north of the Pekin treatment plant. Liberty Park in Peoria is flooded.
13. 25.60 ftWater crosses South Darst Street in Peoria.
14. 25.10 ftA portion of Layne Crossing and North Street are closed in the Rome and Chillicothe areas. Poplar Lane floods in Peoria Heights.
15. 25.00 ftDamage begins at Pekin sewage treatment plant. Minor property damage in Peoria by the river.
16. 24.50 ftA portion of River Beach Drive and Second Street become flooded in the Chillicothe and Rome areas.
17. 24.00 ftWater begins to cover some streets in East Peoria.
18. 23.00 ftSome secondary roads affected in Peoria county and damage begins to buildings in Rome.
19. 22.70 ftFlooding begins to low lying areas in Peoria Heights and Peoria's Riverfront Park.
20. 18.00 ftSome flooding begins to bottomland not protected by levees.
21. 17.50 ftWater approaches Spring Bay Park.
22. 16.70 ftPumping begins in East Peoria near the train yard and Wesley Slough.

Chance of flooding, September to November

The three-month chances are the River Forecast Centers’ long-range flood outlook, issued August 28, 2026.

Most recent crests

• August 20, 2026: 17.28 ft
• July 7, 2026: 19.27 ft
• June 25, 2026: 20.66 ft
• April 23, 2026: 17.94 ft
• April 9, 2026: 17.88 ft
• May 5, 2024: 19.09 ft
• April 10, 2024: 18.83 ft
• February 2, 2024: 21.66 ft
• April 7, 2023: 17.15 ft
• March 10, 2023: 17.48 ft

• UpstreamIllinois River at Chillicothe
• DownstreamIllinois River at Peoria Lock and Dam
• Fondulac Creek at East Peoria
• Farm Creek at Farmdale
• Illinois River at Kingston Mines
• Mackinaw River at Green Valley
• Mackinaw River at Congerville
• Illinois River at Copperas Creek

Forecasts by the North Central River Forecast Center. Forecasts are issued routinely year-round. River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 24 hours into the future from the forecast issuance time.

Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service.