About this river
Mississippi River is a 22.4 mile river near Big Muddy Adventures in Missouri. Streamflow is measured at the USGS gauge Mississippi River at Grafton, IL (site 05587450). The National Hydrography Dataset places it at stream order 10. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1987 to 2026
Mississippi River typically runs highest in May, at a median 227,000 cfs, and lowest in October, at 65,700 cfs. The highest flow on record for any single day is 596,000 cfs, in 1993.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 74,500 | 53,000 to 105,000 | |
| February | 85,600 | 61,400 to 119,000 | |
| March | 141,000 | 106,000 to 204,000 | |
| April | 209,000 | 134,000 to 254,000 | |
| May | 227,000 | 143,000 to 280,000 | |
| June | 209,500 | 111,500 to 262,500 | |
| July | 142,000 | 92,400 to 227,000 | |
| August | 87,000 | 59,100 to 114,000 | |
| September | 67,250 | 51,500 to 92,850 | |
| October | 65,700 | 49,000 to 106,000 | |
| November | 79,400 | 56,550 to 117,000 | |
| December | 75,500 | 53,600 to 112,000 |
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 40 years of record. Statistics published by the US Geological Survey for Mississippi River at Grafton, IL (site 05587450). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Boat access nearby
6 mapped launches sit in the mapped area of Mississippi River, all of them public access. Ramp data comes from the USGS national boat-ramp inventory.
- Cuivre Island Conservation AreaCuivre SloughPublic
- Hide-A-Way HarborMississippi RiverPublic
- Hide-A-Way HarborMississippi RiverPublic
- Boat rampMississippi RiverPublic
- Marquette State ParkIllinois RiverPublic
- Stump LakeIllinois RIverPublic
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Mississippi 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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