Gulkana River at Sourdough AK
USGS Site No: 15200280 • Gulkana River • Copper River Census Area, AK
Gulkana River at Sourdough AK on the Gulkana River is currently at 3,170 cfs (Very High — 106th percentile for this date) . Gage height: 7.75 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 | 406 | |
| 25th | Low threshold | 542 | |
| 50th (Median) | Normal (median) | 700 | |
| 75th | High threshold | 1,090 | |
| 95th | Very High threshold | 1,510 |
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 | 3,470 | — |
| May 27, 2026 | 3,810 | — |
| May 26, 2026 | 3,910 | — |
| May 25, 2026 | 3,930 | — |
| May 24, 2026 | 4,260 | — |
| May 23, 2026 | 4,740 | — |
| May 22, 2026 | 5,130 | — |
| May 21, 2026 | 4,980 | — |
| May 20, 2026 | 4,860 | — |
| May 19, 2026 | 5,310 | — |
| May 18, 2026 | 6,000 | — |
| May 17, 2026 | 6,500 | — |
| May 16, 2026 | 6,110 | — |
| May 15, 2026 | 5,450 | — |
| Oct 28, 2025 | 1,170 | — |
| Oct 27, 2025 | 1,160 | — |
| Oct 26, 2025 | 1,220 | — |
| Oct 25, 2025 | 1,240 | — |
| Oct 24, 2025 | 1,250 | — |
| Oct 23, 2025 | 1,280 | — |
| Oct 22, 2025 | 1,250 | — |
| Oct 21, 2025 | 1,280 | — |
| Oct 20, 2025 | 1,400 | — |
| Oct 19, 2025 | 1,500 | — |
| Oct 18, 2025 | 1,530 | — |
| Oct 17, 2025 | 1,530 | — |
| Oct 16, 2025 | 1,560 | — |
| Oct 15, 2025 | 1,510 | — |
| Oct 14, 2025 | 1,300 | — |
| Oct 13, 2025 | 1,190 | — |
Station Information
- USGS Site No
- 15200280
- State
- AK
- County
- Copper River Census Area
- Coordinates
- 62.5208, -145.5308
- Drainage Area
- 1,760 mi²
- Datum (ft)
- 1,852.1
- HUC Code
- 190201020609
Flood Stage Thresholds
- Action Stage
- 9.5 ft
- Flood Stage
- 11.0 ft
Currently 3.25 ft below flood stage.
Recent Extremes
- Max discharge
-
6,500 cfsMay 17, 2026
- Min discharge
-
245 cfsApr 22, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Tazlina River near Glennallen AKUnknown32.3 mi · 0 cfs
-
Phelan C near Paxson AKUnknown49.8 mi · 0 cfs