Yellowstone River at Yellowstone Lake Outlet Ynp
USGS Site No: 06186500 • Yellowstone River • Teton County, WY
Yellowstone River at Yellowstone Lake Outlet Ynp on the Yellowstone River is currently at 2,290 cfs (Very High — 107th percentile for this date) . Gage height: 4.58 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 | 480 | |
| 25th | Low threshold | 559 | |
| 50th (Median) | Normal (median) | 664 | |
| 75th | High threshold | 823 | |
| 95th | Very High threshold | 1,020 |
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 | 2,120 | — |
| May 27, 2026 | 2,020 | — |
| May 26, 2026 | 1,950 | — |
| May 25, 2026 | 1,900 | — |
| May 24, 2026 | 1,880 | — |
| May 23, 2026 | 1,860 | — |
| May 22, 2026 | 1,850 | — |
| May 21, 2026 | 1,820 | — |
| May 20, 2026 | 1,770 | — |
| May 19, 2026 | 1,750 | — |
| May 18, 2026 | 1,720 | — |
| May 17, 2026 | 1,680 | — |
| May 16, 2026 | 1,630 | — |
| May 15, 2026 | 1,560 | — |
| Apr 20, 2026 | 828 | — |
| Apr 19, 2026 | 822 | — |
| Apr 18, 2026 | 824 | — |
| Apr 17, 2026 | 818 | — |
| Apr 16, 2026 | 818 | — |
| Apr 15, 2026 | 788 | — |
| Apr 14, 2026 | 765 | — |
| Apr 13, 2026 | 751 | — |
| Apr 12, 2026 | 724 | — |
| Apr 11, 2026 | 693 | — |
| Apr 10, 2026 | 666 | — |
| Apr 9, 2026 | 654 | — |
| Apr 8, 2026 | 644 | — |
| Apr 7, 2026 | 636 | — |
| Apr 6, 2026 | 622 | — |
| Apr 5, 2026 | 617 | — |
Station Information
- USGS Site No
- 06186500
- State
- WY
- County
- Teton County
- Coordinates
- 44.5671, -110.3804
- Drainage Area
- 995 mi²
- Datum (ft)
- 7,727.8
- HUC Code
- 10070001
Flood Stage Thresholds
- Action Stage
- 8.0 ft
- Flood Stage
- 9.0 ft
- Moderate Flood
- 10.0 ft
- Major Flood
- 11.0 ft
Currently 4.42 ft below flood stage.
Recent Extremes
- Max discharge
-
3,600 cfsJun 16, 2025
- Min discharge
-
401 cfsDec 15, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Tantalus Creek at Norris Junction, YnpLow20.0 mi · 3 cfs
-
Firehole River at Old Faithful, YnpVery High23.0 mi · 126 cfs
-
Firehole River Near West Yellowstone MountVery High24.1 mi · 329 cfs
-
Gibbon River at Madison Jct, YnpHigh24.2 mi · 107 cfs
-
Lamar River near Tower Ranger Station YnpVery High25.0 mi · 4,060 cfs