RIVER GAUGE · ILLINOIS RIVER
Illinois River at Marseilles Lock (tailwater)
La Salle County, Illinois
Water level458.96 ft
Flow847 cfs
Last readingSep 16, 2026, 4:30 PM UTC (last recorded)
Action466.5 ft
Minor flood467 ft
The past week
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What floods at each level
- 483.5 ft
High water levels cause Marseilles Lock to shut down.
- 466.7 ft
High water levels begin to impact shipping interests along the river.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| Apr 18, 2013 | 476.72 ft | — |
| Sep 15, 2008 | 475.89 ft | — |
| May 18, 2020 | 475.84 ft | — |
When the water runs low
- 456.5
Low water levels begin to impact shipping interests along the river.
More on Illinois River
UpstreamIllinois River at Morris
DownstreamIllinois River at Ottawa
Illinois River at Beardstown
Illinois River at Dresden Lock (tailwater)
Illinois River at Hardin
Illinois River near Havana
Illinois River near Henry
Illinois River near La Salle
Illinois River at Morris
Illinois River at Meredosia
Illinois River at Marseilles
Illinois River at LaGrange Lock and Dam
Get an alert when Illinois River rises
Save this gauge in the free StormCast app and pick the level that matters to you. Your phone goes off when the water gets there.
