Merced River at Happy Isles Bridge near Yosemite CA
USGS Site No: 11264500 • Merced River • Mariposa County, CA
Merced River at Happy Isles Bridge near Yosemite CA on the Merced River is currently at 482 cfs (Very High — 109th percentile for this date) . Gage height: 3.32 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 | 4 | |
| 25th | Low threshold | 7 | |
| 50th (Median) | Normal (median) | 16 | |
| 75th | High threshold | 46 | |
| 95th | Very High threshold | 199 |
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 | 580 | — |
| May 27, 2026 | 662 | — |
| May 26, 2026 | 812 | — |
| May 25, 2026 | 786 | — |
| May 24, 2026 | 839 | — |
| May 23, 2026 | 800 | — |
| May 22, 2026 | 791 | — |
| May 21, 2026 | 671 | — |
| May 20, 2026 | 622 | — |
| May 19, 2026 | 659 | — |
| May 18, 2026 | 802 | — |
| May 17, 2026 | 1,040 | — |
| May 16, 2026 | 1,220 | — |
| May 15, 2026 | 1,380 | — |
| Apr 20, 2026 | 601 | — |
| Apr 19, 2026 | 642 | — |
| Apr 18, 2026 | 621 | — |
| Apr 17, 2026 | 616 | — |
| Apr 16, 2026 | 656 | — |
| Apr 15, 2026 | 647 | — |
| Apr 14, 2026 | 613 | — |
| Apr 13, 2026 | 636 | — |
| Apr 12, 2026 | 655 | — |
| Apr 11, 2026 | 717 | — |
| Apr 10, 2026 | 766 | — |
| Apr 9, 2026 | 787 | — |
| Apr 8, 2026 | 742 | — |
| Apr 7, 2026 | 684 | — |
| Apr 6, 2026 | 625 | — |
| Apr 5, 2026 | 596 | — |
Station Information
- USGS Site No
- 11264500
- State
- CA
- County
- Mariposa County
- Coordinates
- 37.7313, -119.5590
- Drainage Area
- 181 mi²
- Datum (ft)
- 4,020.5
- HUC Code
- 18040008
Flood Stage Thresholds
- Flood Stage
- 7.5 ft
- Moderate Flood
- 10.0 ft
- Major Flood
- 13.3 ft
Currently 4.18 ft below flood stage.
Recent Extremes
- Max discharge
-
2,100 cfsMay 11, 2025
- Min discharge
-
12 cfsAug 22, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
- Unknown
- Unknown
- Unknown
- Unknown
- Unknown