Mississippi River at Chester, IL
USGS Site No: 07020500 • Mississippi River • Randolph County, IL
Mississippi River at Chester, IL on the Mississippi River is currently at 256,000 cfs (High — 82th percentile for this date) . Gage height: 16.70 ft.
Reading from
Historical Percentile Comparison
Today's discharge compared to the long-term record for October 28 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 | 74,800 | |
| 25th | Low threshold | 92,300 | |
| 50th (Median) | Normal (median) | 123,000 | |
| 75th | High threshold | 186,000 | |
| 95th | Very High threshold | 390,000 | Today: 256,000 cfs |
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 | 283,000 | — |
| May 27, 2026 | 308,000 | — |
| May 26, 2026 | 337,000 | — |
| May 25, 2026 | 370,000 | — |
| May 24, 2026 | 396,000 | — |
| May 23, 2026 | 404,000 | — |
| May 22, 2026 | 391,000 | — |
| May 21, 2026 | 356,000 | — |
| May 20, 2026 | 284,000 | — |
| May 19, 2026 | 238,000 | — |
| May 18, 2026 | 230,000 | — |
| May 17, 2026 | 247,000 | — |
| May 16, 2026 | 260,000 | — |
| May 15, 2026 | 270,000 | — |
| Apr 20, 2026 | 433,000 | — |
| Apr 19, 2026 | 406,000 | — |
| Apr 18, 2026 | 391,000 | — |
| Apr 17, 2026 | 383,000 | — |
| Apr 16, 2026 | 358,000 | — |
| Apr 15, 2026 | 334,000 | — |
| Apr 14, 2026 | 326,000 | — |
| Apr 13, 2026 | 327,000 | — |
| Apr 12, 2026 | 330,000 | — |
| Apr 11, 2026 | 333,000 | — |
| Apr 10, 2026 | 338,000 | — |
| Apr 9, 2026 | 344,000 | — |
| Apr 8, 2026 | 351,000 | — |
| Apr 7, 2026 | 371,000 | — |
| Apr 6, 2026 | 375,000 | — |
| Apr 5, 2026 | 332,000 | — |
Station Information
- USGS Site No
- 07020500
- State
- IL
- County
- Randolph County
- Coordinates
- 37.9008, -89.8302
- Drainage Area
- 708,600 mi²
- Datum (ft)
- 340.7
- HUC Code
- 07140105
Flood Stage Thresholds
- Action Stage
- 25.0 ft
- Flood Stage
- 27.0 ft
- Moderate Flood
- 35.0 ft
- Major Flood
- 40.0 ft
Currently 10.30 ft below flood stage.
Recent Extremes
- Max discharge
-
433,000 cfsApr 20, 2026
- Min discharge
-
71,900 cfsJan 22, 2026
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
South Fork Saline Creek Near Perryville, MOHigh12.5 mi · 21 cfs
-
Kaskaskia River at New Athens, ILVery High29.1 mi · 5,590 cfs
-
Big Muddy River at Rte 127 at Murphysboro, ILHigh29.1 mi · 509 cfs
-
Richland Creek Near Hecker, ILHigh30.2 mi · 54 cfs
-
Silver Creek Near Freeburg, ILHigh35.0 mi · 146 cfs