About this river
Illinois River is a 5.3 mile river near Strayhorn Marina Tenkiller in Oklahoma. Streamflow is measured at the USGS gauge Illinois River near Gore, OK (site 07198000). The National Hydrography Dataset places it at stream order 7. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1954 to 2026
Illinois River typically runs highest in April, at a median 2,090 cfs, and lowest in October, at 292 cfs. The highest flow on record for any single day is 34,400 cfs, in 2016.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 1,170 | 317 to 2,340 | |
| February | 1,200 | 328 to 2,360 | |
| March | 1,280 | 367 to 2,900 | |
| April | 2,090 | 623 to 3,825 | |
| May | 1,790 | 552 to 3,530 | |
| June | 1,215 | 400 to 2,305 | |
| July | 968 | 386 to 1,530 | |
| August | 876 | 287 to 1,350 | |
| September | 473 | 129 to 958 | |
| October | 292 | 99 to 971 | |
| November | 528 | 105 to 1,560 | |
| December | 929 | 268 to 2,030 |
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 73 years of record. Statistics published by the US Geological Survey for Illinois River near Gore, OK (site 07198000). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Boat access nearby
One mapped launch sits in the mapped area of Illinois River. Ramp data comes from the USGS national boat-ramp inventory.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Illinois 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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