Tuolumne River at Grand Cyn Of Tuolumne above Hetch Hetchy
USGS Site No: 11274790 • Tuolumne River • Tuolumne County, CA
Tuolumne River at Grand Cyn Of Tuolumne above Hetch Hetchy on the Tuolumne River is currently at 819 cfs (High — 85th percentile for this date) . Gage height: 10.69 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 | 7 | |
| 25th | Low threshold | 10 | |
| 50th (Median) | Normal (median) | 14 | |
| 75th | High threshold | 82 | |
| 95th | Very High threshold | 1,510 | Today: 819 cfs |
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 | 983 | — |
| May 27, 2026 | 1,060 | — |
| May 26, 2026 | 1,380 | — |
| May 25, 2026 | 1,350 | — |
| May 24, 2026 | 1,420 | — |
| May 23, 2026 | 1,360 | — |
| May 22, 2026 | 1,300 | — |
| May 21, 2026 | 1,100 | — |
| May 20, 2026 | 1,020 | — |
| May 19, 2026 | 1,040 | — |
| May 18, 2026 | 1,240 | — |
| May 17, 2026 | 1,620 | — |
| May 16, 2026 | 1,870 | — |
| May 15, 2026 | 2,050 | — |
| Apr 20, 2026 | 1,030 | — |
| Apr 19, 2026 | 1,090 | — |
| Apr 18, 2026 | 1,030 | — |
| Apr 17, 2026 | 1,030 | — |
| Apr 16, 2026 | 1,100 | — |
| Apr 15, 2026 | 1,070 | — |
| Apr 14, 2026 | 1,030 | — |
| Apr 13, 2026 | 1,080 | — |
| Apr 12, 2026 | 1,130 | — |
| Apr 11, 2026 | 1,150 | — |
| Apr 10, 2026 | 1,220 | — |
| Apr 9, 2026 | 1,220 | — |
| Apr 8, 2026 | 1,130 | — |
| Apr 7, 2026 | 1,040 | — |
| Apr 6, 2026 | 942 | — |
| Apr 5, 2026 | 900 | — |
Station Information
- USGS Site No
- 11274790
- State
- CA
- County
- Tuolumne County
- Coordinates
- 37.9166, -119.6599
- Drainage Area
- 301 mi²
- Datum (ft)
- 3,813.7
- HUC Code
- 18040009
Recent Extremes
- Max discharge
-
3,430 cfsMay 11, 2025
- Min discharge
-
20 cfsAug 22, 2025
Computed from the local daily-values archive.
Nearby Gauges
-
Tuolumne River near Hetch Hetchy CAVery High7.7 mi · 366 cfs
-
Merced River at Pohono Bridge near Yosemite CAVery High13.8 mi · 778 cfs
-
Merced River at Happy Isles Bridge near Yosemite CAVery High13.9 mi · 482 cfs
-
Cherry C below Valley Dam near Hetch Hetchy CANormal14.5 mi · 7 cfs
-
Tuolumne River above Early Intake near Mather CAVery High15.9 mi · 418 cfs