About this river
Illinois Bayou is a 21.1 mile river near Whenever Watersports in Arkansas. Streamflow is measured at the USGS gauge Illinois Bayou near Scottsville, AR (site 07257500). The National Hydrography Dataset places it at stream order 5. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1948 to 2026
Illinois Bayou typically runs highest in March, at a median 437 cfs, and lowest in September, at 3.8 cfs. The highest flow on record for any single day is 38,500 cfs, in 1949.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 209 | 98 to 487 | |
| February | 348 | 152 to 636 | |
| March | 437 | 231 to 862 | |
| April | 391 | 213 to 765 | |
| May | 293 | 136 to 739 | |
| June | 71 | 21 to 224 | |
| July | 18 | 3.1 to 83 | |
| August | 7.2 | 2.1 to 32 | |
| September | 3.8 | 0.8 to 26 | |
| October | 7.3 | 1.0 to 39 | |
| November | 45 | 9.8 to 169 | |
| December | 160 | 51 to 390 |
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 49 years of record. Statistics published by the US Geological Survey for Illinois Bayou near Scottsville, AR (site 07257500). 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 Illinois Bayou's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
See every free widget you can put on your site, including live conditions and a 7 day forecast.
