* WHAT...Afternoon Heat index values of 100 to 108.
* WHERE...Portions of central, east central, southeast, and west
central Illinois.
* WHEN...Until 7 PM CDT Friday.
* IMPACTS...Hot temperatures and high humidity may cause heat
illnesses.
Heat Advisory
Until 2026-09-02T16:00:00-05:00
•
National Weather Service
* WHAT...Afternoon Heat index values of 100 to 108.
* WHERE...Portions of central, east central, southeast, and west
central Illinois.
* WHEN...Until 7 PM CDT Friday.
* IMPACTS...Hot temperatures and high humidity may cause heat
illnesses.
MACKINAW RIVER NEAR CONGERVILLE, IL
Realtime Data
•
Report
•
Conditions
212
Discharge (cfs)
1.5
Gauge Height (ft)
Streamflow discharge was last observed at 158 cfs, and a gauge height of 1.49 feet.
With the
% decrease since yesterday,
the streamflow average over the past 10 days is 349 .
Weather today, Tomorrow,
The river is fed by several tributaries and its flow is influenced by seasonal trends, with higher flow rates typically occurring in the spring and lower flow rates in the summer. There are no major dams on the Mackinaw River near Congerville, but the river does have some interesting hydrological features, such as steep banks and a variety of aquatic plant and animal species. Overall, the Mackinaw River near Congerville is an important resource for understanding the hydrology of the area and its impact on local ecosystems.
September 2, 2026
Elevation
611.0 ft
Last Updated
Gage height, ft
1.49 ft
Nitrate plus nitrite, water, in situ, mg/L as N
0.7 mg/l as N
Streamflow, ft³/s
158.0 ft3/s
Specific conductance, water, unfiltered, microsiemens per centimeter at 25°C
714.0 uS/cm @25C
Dissolved oxygen, water, unfiltered, mg/L
5.2 mg/l
Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 ±2.5°, formazin nephelometric units (FNU)