Summary
Total streamflow across the
Mackinaw River
was last observed at
333
cfs, and is expected to yield approximately
660
acre-ft of water today; about 19%
of normal.
River levels are low and may signify a drought.
Average streamflow for this time of year is
1,782 cfs,
with recent peaks last observed
on
2019-05-04 when daily discharge volume was observed at
26,190 cfs.
Maximum discharge along the river is currently at the
Mackinaw River Near Green Valley
reporting a streamflow rate of 196 cfs.
This is also the highest stage along the Mackinaw River, with a gauge stage of
13.71 ft at this location.
This river is monitored from 2 different streamgauging stations along the Mackinaw River, the highest being situated at an altitude of 611 ft, the
Mackinaw River Near Congerville.
15-Day Weather Outlook
River Details
| Last Updated | 2026-03-27 |
| Discharge Volume | 660 ACRE-FT |
| Streamflow |
333.0 cfs
-17.0 cfs (-4.86%) |
| Percent of Normal | 18.69% |
| Maximum |
26,190.0 cfs
2019-05-04 |
| Seasonal Avg | 1,782 cfs |
River Streamflow Levels
| Streamgauge | Streamflow | Gauge Stage | 24hr Change (%) | % Normal | Minimum (cfs) | Maximum (cfs) | Air Temp | Elevation |
|---|---|---|---|---|---|---|---|---|
|
Mackinaw River Near Congerville
USGS 05567500 |
137 cfs | 1.47 ft | 10.48 | |||||
|
Mackinaw River Near Green Valley
USGS 05568000 |
196 cfs | 13.71 ft | -13.27 |
Seasonal Discharge Comparison
Maximum Streamflow Discharge
Streamflow Elevation Profile
The Mackinaw River is a 130-mile-long (210 km) tributary of the Illinois River in the U.S. state of Illinois. Its watershed covers approximately 1,136 square miles (3,000 km2), and contains some of the most productive agricultural land in the United States. The river itself maintains some of the highest quality streams in the state and provides habitat for 60-70 native fish species and 25-30 species of mussels. Its name, also spelled Mackinac, is derived from the Ojibwe word mikinaak meaning "turtle".