Mississippi River at Grafton, IL
USGS Site No: 05587450 • Mississippi River • Jersey County, IL
Mississippi River at Grafton, IL on the Mississippi River is currently at 95,200 cfs (Normal — 64th percentile for this date) . Gage height: 15.43 ft.
Reading from
Historical Percentile Comparison
Today's discharge compared to the long-term record for October 27 at this station. Percentile rank shows what fraction of historical years had lower flow on this date.
| Percentile | Label | CFS Threshold | Today's Flow |
|---|---|---|---|
| 10th | Very Low threshold | 41,000 | |
| 25th | Low threshold | 53,700 | |
| 50th (Median) | Normal (median) | 76,900 | |
| 75th | High threshold | 110,000 | Today: 95,200 cfs |
| 95th | Very High threshold | 281,000 |
30-Day Hydrograph
Recent discharge plotted against the historical 10th–95th percentile envelope for the same calendar days. Source: USGS daily values + long-term statistics.
30-Day Flow History
| Date | Discharge (CFS) | Gage Ht (ft) |
|---|---|---|
| May 28, 2026 | 87,600 | — |
| May 27, 2026 | 99,600 | — |
| May 26, 2026 | 109,000 | — |
| May 25, 2026 | 106,000 | — |
| May 24, 2026 | 131,000 | — |
| May 23, 2026 | 166,000 | — |
| May 22, 2026 | 168,000 | — |
| May 21, 2026 | 168,000 | — |
| May 20, 2026 | 179,000 | — |
| May 19, 2026 | 174,000 | — |
| May 18, 2026 | 108,000 | — |
| May 17, 2026 | 102,000 | — |
| May 16, 2026 | 112,000 | — |
| May 15, 2026 | 168,000 | — |
| Apr 20, 2026 | 279,000 | — |
| Apr 19, 2026 | 272,000 | — |
| Apr 18, 2026 | 263,000 | — |
| Apr 17, 2026 | 261,000 | — |
| Apr 16, 2026 | 262,000 | — |
| Apr 15, 2026 | 257,000 | — |
| Apr 14, 2026 | 253,000 | — |
| Apr 13, 2026 | 250,000 | — |
| Apr 12, 2026 | 249,000 | — |
| Apr 11, 2026 | 248,000 | — |
| Apr 10, 2026 | 245,000 | — |
| Apr 9, 2026 | 240,000 | — |
| Apr 8, 2026 | 236,000 | — |
| Apr 7, 2026 | 232,000 | — |
| Apr 6, 2026 | 233,000 | — |
| Apr 5, 2026 | 232,000 | — |
Station Information
- USGS Site No
- 05587450
- State
- IL
- County
- Jersey County
- Coordinates
- 38.9680, -90.4290
- Drainage Area
- 171,300 mi²
- Datum (ft)
- 403.3
- HUC Code
- 07110009
Flood Stage Thresholds
- Action Stage
- 18.0 ft
- Flood Stage
- 20.0 ft
- Moderate Flood
- 24.0 ft
- Major Flood
- 29.0 ft
Currently 4.57 ft below flood stage.
Recent Extremes
- Max discharge
-
279,000 cfsApr 20, 2026
- Min discharge
-
30,000 cfsSep 22, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Mill Creek Near Florissant, MOHigh11.3 mi · 1 cfs
-
Missouri River at St. Charles, MOHigh12.7 mi · 117,000 cfs
-
Cowmire Creek at Bridgeton, MONormal14.1 mi · 1 cfs
-
Coldwater Creek Near Black Jack, MONormal14.1 mi · 8 cfs
-
Dardenne Creek at Old Town St. Peters, MOLow15.6 mi · 9 cfs