Koyukuk River at Hughes AK
USGS Site No: 15564900 • Koyukuk River • Yukon-Koyukuk Census Area, AK
Koyukuk River at Hughes AK on the Koyukuk River is currently at 55,200 cfs (Very High — 119th percentile for this date) . Gage height: 53.17 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 | 1,780 | |
| 25th | Low threshold | 3,080 | |
| 50th (Median) | Normal (median) | 4,000 | |
| 75th | High threshold | 6,750 | |
| 95th | Very High threshold | 16,200 |
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 29, 2026 | 55,500 | — |
| May 28, 2026 | 55,700 | — |
| May 27, 2026 | 56,600 | — |
| May 26, 2026 | 60,000 | — |
| May 25, 2026 | 66,300 | — |
| May 24, 2026 | 65,100 | — |
| May 23, 2026 | 57,600 | — |
| May 22, 2026 | 54,400 | — |
| May 21, 2026 | 52,000 | — |
| May 20, 2026 | 52,000 | — |
| Feb 26, 2026 | 192,000 | — |
| Feb 25, 2026 | 187,000 | — |
| Feb 24, 2026 | 181,000 | — |
| Feb 23, 2026 | 175,000 | — |
| Feb 22, 2026 | 169,000 | — |
| Feb 21, 2026 | 163,000 | — |
| Feb 20, 2026 | 157,000 | — |
| Feb 19, 2026 | 151,000 | — |
| Feb 18, 2026 | 145,000 | — |
| Feb 17, 2026 | 139,000 | — |
| Feb 16, 2026 | 133,000 | — |
| Feb 15, 2026 | 127,000 | — |
| Feb 14, 2026 | 121,000 | — |
| Feb 13, 2026 | 115,000 | — |
| Feb 12, 2026 | 109,000 | — |
| Feb 11, 2026 | 103,000 | — |
| Feb 10, 2026 | 96,600 | — |
| Feb 9, 2026 | 90,500 | — |
| Feb 8, 2026 | 84,400 | — |
| Feb 7, 2026 | 78,400 | — |
Station Information
- USGS Site No
- 15564900
- State
- AK
- County
- Yukon-Koyukuk Census Area
- Coordinates
- 66.0470, -154.2611
- Drainage Area
- 17,990 mi²
- Datum (ft)
- 231.6
- HUC Code
- 19090108
Flood Stage Thresholds
- Action Stage
- 62.0 ft
- Flood Stage
- 64.0 ft
- Moderate Flood
- 67.0 ft
- Major Flood
- 70.0 ft
Currently 10.83 ft below flood stage.
Recent Extremes
- Max discharge
-
192,000 cfsFeb 26, 2026
- Min discharge
-
1,330 cfsJan 24, 2026
- Days at flood stage
- 0
Computed from the local daily-values archive.