About this river
Ohio River is a 14.6 mile river near Cache Bayou Outfitters in Illinois. Streamflow is measured at the USGS gauge Ohio River at Olmsted, IL (site 03612600). The National Hydrography Dataset places it at stream order 9. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
2013 to 2024
Ohio River typically runs highest in March, at a median 604,000 cfs, and lowest in September, at 104,000 cfs. The highest flow on record for any single day is 1,240,000 cfs, in 2019.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 450,000 | 328,000 to 671,000 | |
| February | 501,000 | 309,500 to 851,000 | |
| March | 604,000 | 400,000 to 850,000 | |
| April | 476,500 | 308,000 to 693,500 | |
| May | 356,000 | 247,000 to 462,000 | |
| June | 202,000 | 153,000 to 299,000 | |
| July | 197,000 | 127,000 to 292,000 | |
| August | 145,000 | 123,000 to 173,000 | |
| September | 104,000 | 82,250 to 154,000 | |
| October | 108,000 | 67,500 to 180,000 | |
| November | 178,000 | 116,500 to 250,000 | |
| December | 303,000 | 198,000 to 516,000 |
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 11 years of record. Statistics published by the US Geological Survey for Ohio River at Olmsted, IL (site 03612600). 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 Ohio River. Ramp data comes from the USGS national boat-ramp inventory.
- Fort Massac State ParkOhio RiverPublic
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Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Ohio 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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