About this river
Vermilion River is a 26.2 mile river near Kayak Starved Rock in Illinois. Streamflow is measured at the USGS gauge Vermilion River near Leonore, IL (site 05555300). The National Hydrography Dataset places it at stream order 6. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1972 to 2026
Vermilion River typically runs highest in March, at a median 1,050 cfs, and lowest in September, at 41 cfs. The highest flow on record for any single day is 30,400 cfs, in 2013.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 428 | 166 to 950 | |
| February | 500 | 135 to 1,380 | |
| March | 1,050 | 537 to 2,100 | |
| April | 1,003 | 565 to 2,045 | |
| May | 979 | 530 to 1,870 | |
| June | 710 | 340 to 1,405 | |
| July | 326 | 138 to 692 | |
| August | 68 | 32 to 172 | |
| September | 41 | 22 to 141 | |
| October | 55 | 21 to 244 | |
| November | 178 | 52 to 601 | |
| December | 451 | 88 to 1,070 |
Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 55 years of record. Statistics published by the US Geological Survey for Vermilion River near Leonore, IL (site 05555300). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Vermilion River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
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