Marias River Near Chester Mount
USGS Site No: 06101500 • Marias River • Liberty County, MT
Marias River Near Chester Mount on the Marias River is currently at 610 cfs (Normal — 60th percentile for this date) . Gage height: 3.56 ft. This station is at or above flood stage.
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 | 256 | |
| 25th | Low threshold | 394 | |
| 50th (Median) | Normal (median) | 524 | |
| 75th | High threshold | 737 | Today: 610 cfs |
| 95th | Very High threshold | 1,310 |
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 | 610 | — |
| May 27, 2026 | 636 | — |
| May 26, 2026 | 606 | — |
| May 25, 2026 | 604 | — |
| May 24, 2026 | 604 | — |
| May 23, 2026 | 604 | — |
| May 22, 2026 | 604 | — |
| May 21, 2026 | 604 | — |
| May 20, 2026 | 604 | — |
| May 19, 2026 | 604 | — |
| May 18, 2026 | 541 | — |
| May 17, 2026 | 525 | — |
| May 16, 2026 | 525 | — |
| May 15, 2026 | 522 | — |
| Apr 20, 2026 | 504 | — |
| Apr 19, 2026 | 504 | — |
| Apr 18, 2026 | 504 | — |
| Apr 17, 2026 | 504 | — |
| Apr 16, 2026 | 504 | — |
| Apr 15, 2026 | 456 | — |
| Apr 14, 2026 | 412 | — |
| Apr 13, 2026 | 412 | — |
| Apr 12, 2026 | 412 | — |
| Apr 11, 2026 | 412 | — |
| Apr 10, 2026 | 412 | — |
| Apr 9, 2026 | 412 | — |
| Apr 8, 2026 | 412 | — |
| Apr 7, 2026 | 411 | — |
| Apr 6, 2026 | 378 | — |
| Apr 5, 2026 | 338 | — |
Station Information
- USGS Site No
- 06101500
- State
- MT
- County
- Liberty County
- Coordinates
- 48.3060, -111.0805
- Drainage Area
- 4,944 mi²
- Datum (ft)
- 2,814.0
- HUC Code
- 10030203
Flood Stage Thresholds
- Action Stage
- 9.0 ft
Recent Extremes
- Max discharge
-
636 cfsMay 27, 2026
- Min discharge
-
249 cfsMar 7, 2026
Computed from the local daily-values archive.
Nearby Gauges
-
Willow Creek Near Galata, MountNormal15.6 mi · 0 cfs
-
Marias River Near Loma MountNormal33.9 mi · 524 cfs
-
Teton River at Loma MountNormal36.7 mi · 18 cfs
-
Marias River Near Shelby MountVery High38.1 mi · 2,100 cfs
-
Missouri River at Fort Benton MountHigh38.8 mi · 6,740 cfs