Sangamon River at Petersburg, IL
River level and flood forecast · Menard County
Normal4.5 ftas of Mon 3:15 PM
The river is 18.5 ft below flood stage (23 ft).
Flow: 164 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 6 PM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 33 ft |
| Moderate flood stage | 24 ft |
| Flood stage | 23 ft |
| Action stage | 18 ft |
| Record crest (May 20, 1943) | 33.9 ft |
What floods at each level
From the National Weather Service, highest first.
- 29 ftRoute 123 is closed. Water overtops Illinois Midland railroad tracks at 4th Street.
- 25 ftSome residences on the east side of Petersburg flood.
- 23 ftExtensive agricultural and lowland flooding occurs.
- 22 ftAltig Bridge Ave. closed due to water over the west approach roadway.
- 21 ftPark and recreational land near the river in Petersburg is flooded.
- 15 ftWater begins to flood agricultural areas and local parks near the river.
Highest crests on record
- 33.9 ft — May 20, 1943
- 30.75 ft — May 14, 2002
- 30.55 ft — December 31, 2015
- 29.84 ft — April 14, 1994
- 27.45 ft — May 11, 1996
Recent crests: 18.73 ft (January 26, 2024) · 17.64 ft (February 25, 2022) · 19.3 ft (July 4, 2021) · 18.97 ft (May 22, 2021) · 23.8 ft (May 20, 2020)
Up and down the river, and nearby
- UpstreamSangamon River at Riverton, IL
- DownstreamSangamon River near Oakford, IL
- Salt Creek (IL) near Greenview, IL
- Sangamon River near Springfield, IL
- Spring Creek (IL) at Springfield, IL
- Sugar Creek (W-Central IL) near Springfield, IL
- South Fork Sangamon River below Rochester - AUX, IL
- South Fork Sangamon River near Rochester, IL
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (PETI2); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.