Mackinaw River Flow Today
As of October 2, 2026 at 3:45 AM, the Mackinaw River is flowing at 145 cfs near Green Valley, IL — 175% of normal for the date and up 14% in 24 hours. 2 of 2 USGS gauges reported in the last 3 days; flows range from 88 to 145 cfs. ❤ Favorite
Mackinaw River map
See the Mackinaw River on a live map
Every gauge, dam and paddle run on the river, one tap each:
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Mackinaw River conditions today
Where the river is running versus normal, what’s rising or dropping, and what it means for a trip — built from the live USGS readings below.
At Green Valley, the Mackinaw River is running 145 cfs — 175% of normal, up 14% since yesterday. Along the river, 2 of 2 reporting gauges are above normal (the typical gauge is at 212% of normal).
In the last 24 hours the river is rising at Congerville (+17%) and Green Valley (+14%).
How the Mackinaw River compares to normal
Every reporting gauge from the top of the river to the bottom: bar length is today’s flow, colour is percent of normal for the date.
Flow along the river, upstream to downstream
- Congerville611 ft 88 cfs250%
- Green Valley501 ft 145 cfs175%
Bar length uses a square-root scale so small headwater flows stay visible next to big downstream ones. Colour: <50% 50–90 90–110 110–150 150%+ of normal.
Where every gauge sits
One dot per Mackinaw River streamgauge, placed by its own percent of normal. The line is the typical gauge (212%).
Mackinaw River flow report
| Streamgage | Streamflow | % of normal | 24h | Gage height | To flood stage | Elevation |
|---|---|---|---|---|---|---|
|
Mackinaw River Near Congerville IL
Oct 2, 3:45 AM · USGS 05567500 |
88 cfs | 250% | +17% | 1.24 ft | 11.8 ft below | 611 ft |
|
Mackinaw River Near Green Valley IL
Oct 2, 3:45 AM · USGS 05568000 |
145 cfs | 175% | +14% | 13.95 ft | · | 501 ft |
USGS provisional data. Readings are in each gauge’s local time; gauges silent for more than 3 days are marked “Last reported”. Tap any gauge for its hydrograph, forecast and history.
Dams & reservoirs on the Mackinaw River
Releases from these dams shape the flow downstream. Tap one for its daily level and history.
Mackinaw River streamflow over time
Daily total flow across every monitored gauge on the river.
Maximum streamflow by year
Mackinaw River
The Mackinaw River flows through central Illinois, spanning 130 miles from its headwaters in McLean County to its confluence with the Illinois River in Tazewell County. The river's name comes from the Native American word "Makinauk," meaning turtle. The Mackinaw River has a drainage area of 1,800 square miles and is fed by several tributaries. The river has two major reservoirs, including the Evergreen Lake and Lake Bloomington, which serve as sources of drinking water for nearby communities. The river is also used for recreational activities such as fishing, canoeing, and camping. It is a popular spot for fly fishing and is home to several species of fish, including smallmouth bass and channel catfish. The river also supports agricultural activities, including crop irrigation and livestock watering.
About the Mackinaw River
How is the Mackinaw River flowing right now?
As of October 2, 2026, the Mackinaw River is flowing at 145 cfs near Green Valley, IL, about 175% of normal for the date. Across its 2 USGS gauges, current flows range from 88 to 145 cfs. Every gauge’s live reading is in the table above.
Is the Mackinaw River running high or low?
The typical gauge on the Mackinaw River is at 212% of normal for the date. Above 100% means higher than the historical average for this calendar day; below 100% means lower. The profile above shows which reaches are high or low.
What is flood stage on the Mackinaw River?
The National Weather Service sets flood stages for Congerville (13.0 ft), . The table shows how far each gauge is below its flood stage right now.
Where does the data come from?
Discharge and gage height are from the USGS National Water Information System; flood stages from the National Weather Service. The history chart sums every monitored gauge on the river.
Can I get alerts for a gauge?
Yes — open any gauge from the table, favorite it in the Snoflo app and set a flow threshold.