Tongue River at State Line near Decker Mount
USGS Site No: 06306300 • Tongue River • Big Horn County, MT
Tongue River at State Line near Decker Mount on the Tongue River is currently at 399 cfs (Very High — 97th percentile for this date) . Gage height: 3.20 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 | 160 | |
| 25th | Low threshold | 198 | |
| 50th (Median) | Normal (median) | 232 | |
| 75th | High threshold | 263 | |
| 95th | Very High threshold | 343 |
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 | 296 | — |
| May 27, 2026 | 239 | — |
| May 26, 2026 | 214 | — |
| May 25, 2026 | 220 | — |
| May 24, 2026 | 247 | — |
| May 23, 2026 | 249 | — |
| May 22, 2026 | 256 | — |
| May 21, 2026 | 255 | — |
| May 20, 2026 | 249 | — |
| May 19, 2026 | 259 | — |
| May 18, 2026 | 260 | — |
| May 17, 2026 | 279 | — |
| May 16, 2026 | 311 | — |
| May 15, 2026 | 331 | — |
| Apr 20, 2026 | 268 | — |
| Apr 19, 2026 | 273 | — |
| Apr 18, 2026 | 277 | — |
| Apr 17, 2026 | 294 | — |
| Apr 16, 2026 | 283 | — |
| Apr 15, 2026 | 291 | — |
| Apr 14, 2026 | 313 | — |
| Apr 13, 2026 | 324 | — |
| Apr 12, 2026 | 316 | — |
| Apr 11, 2026 | 314 | — |
| Apr 10, 2026 | 343 | — |
| Apr 9, 2026 | 386 | — |
| Apr 8, 2026 | 387 | — |
| Apr 7, 2026 | 413 | — |
| Apr 6, 2026 | 441 | — |
| Apr 5, 2026 | 308 | — |
Station Information
- USGS Site No
- 06306300
- State
- MT
- County
- Big Horn County
- Coordinates
- 45.0091, -106.8359
- Drainage Area
- 1,453 mi²
- Datum (ft)
- 3,431.0
- HUC Code
- 10090101
Recent Extremes
- Max discharge
-
2,590 cfsMay 20, 2025
- Min discharge
-
59 cfsJan 17, 2026
Computed from the local daily-values archive.
Nearby Gauges
-
Tongue River at Tongue River Dam near Decker MountNormal9.7 mi · 271 cfs
-
Rosebud C at Reservation Bndry near Kirby MountHigh25.5 mi · 6 cfs
-
Little Bighorn River below Pass Creek near Wyola MountVery Low29.6 mi · 88 cfs
-
Tongue River at Birney Day School Branch near Birney MountHigh33.4 mi · 310 cfs
-
Little Bighorn River at State Line near Wyola MountVery High38.1 mi · 286 cfs