Ruby River Below Reservoir Near Alder, Mount
USGS Site No: 06020600 • Ruby River • Madison County, MT
Ruby River Below Reservoir Near Alder, Mount on the Ruby River is currently at 329 cfs (Very High — 105th percentile for this date) . Gage height: 3.58 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 | 41 | |
| 25th | Low threshold | 50 | |
| 50th (Median) | Normal (median) | 69 | |
| 75th | High threshold | 90 | |
| 95th | Very High threshold | 167 |
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 | 330 | — |
| May 27, 2026 | 349 | — |
| May 26, 2026 | 355 | — |
| May 25, 2026 | 352 | — |
| May 24, 2026 | 346 | — |
| May 23, 2026 | 347 | — |
| May 22, 2026 | 349 | — |
| May 21, 2026 | 358 | — |
| May 20, 2026 | 369 | — |
| May 19, 2026 | 380 | — |
| May 18, 2026 | 405 | — |
| May 17, 2026 | 419 | — |
| May 16, 2026 | 420 | — |
| May 15, 2026 | 406 | — |
| Apr 20, 2026 | 132 | — |
| Apr 19, 2026 | 106 | — |
| Apr 18, 2026 | 84 | — |
| Apr 17, 2026 | 71 | — |
| Apr 16, 2026 | 47 | — |
| Apr 15, 2026 | 50 | — |
| Apr 14, 2026 | 46 | — |
| Apr 13, 2026 | 46 | — |
| Apr 12, 2026 | 46 | — |
| Apr 11, 2026 | 46 | — |
| Apr 10, 2026 | 46 | — |
| Apr 9, 2026 | 45 | — |
| Apr 8, 2026 | 45 | — |
| Apr 7, 2026 | 45 | — |
| Apr 6, 2026 | 45 | — |
| Apr 5, 2026 | 45 | — |
Station Information
- USGS Site No
- 06020600
- State
- MT
- County
- Madison County
- Coordinates
- 45.2419, -112.1112
- Drainage Area
- 595 mi²
- Datum (ft)
- 5,286.6
- HUC Code
- 10020003
Recent Extremes
- Max discharge
-
703 cfsMay 13, 2025
- Min discharge
-
41 cfsDec 9, 2025
Computed from the local daily-values archive.
Nearby Gauges
-
Ruby River Above Reservoir Near Alder, MountVery High3.8 mi · 210 cfs
-
Madison River Near Cameron MountNormal17.5 mi · 1,300 cfs
-
Beaverhead River Near Twin Bridges MountVery Low19.3 mi · 90 cfs
-
Madison River at Ennis, MountVery High20.3 mi · 1,460 cfs
-
Ruby River Near Twin Bridges MountVery Low21.2 mi · 20 cfs