Mad River near Arcata CA
USGS Site No: 11481000 • Mad River • Humboldt County, CA
Mad River near Arcata CA on the Mad River is currently at 147 cfs (Normal — 41th percentile for this date) . Gage height: 6.30 ft.
Reading from
Historical Percentile Comparison
Today's discharge compared to the long-term record for June 11 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 | 71 | |
| 25th | Low threshold | 101 | |
| 50th (Median) | Normal (median) | 172 | Today: 147 cfs |
| 75th | High threshold | 248 | |
| 95th | Very High threshold | 812 |
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 | 144 | — |
| May 27, 2026 | 150 | — |
| May 26, 2026 | 144 | — |
| May 25, 2026 | 143 | — |
| May 24, 2026 | 143 | — |
| May 23, 2026 | 150 | — |
| May 22, 2026 | 152 | — |
| May 21, 2026 | 159 | — |
| May 20, 2026 | 161 | — |
| May 19, 2026 | 169 | — |
| May 18, 2026 | 174 | — |
| May 17, 2026 | 183 | — |
| May 16, 2026 | 188 | — |
| May 15, 2026 | 200 | — |
| Apr 20, 2026 | 516 | — |
| Apr 19, 2026 | 526 | — |
| Apr 18, 2026 | 600 | — |
| Apr 17, 2026 | 716 | — |
| Apr 16, 2026 | 897 | — |
| Apr 15, 2026 | 745 | — |
| Apr 14, 2026 | 834 | — |
| Apr 13, 2026 | 1,040 | — |
| Apr 12, 2026 | 776 | — |
| Apr 11, 2026 | 473 | — |
| Apr 10, 2026 | 330 | — |
| Apr 9, 2026 | 265 | — |
| Apr 8, 2026 | 281 | — |
| Apr 7, 2026 | 307 | — |
| Apr 6, 2026 | 342 | — |
| Apr 5, 2026 | 400 | — |
Station Information
- USGS Site No
- 11481000
- State
- CA
- County
- Humboldt County
- Coordinates
- 40.9098, -124.0606
- Drainage Area
- 485 mi²
- Datum (ft)
- 14.3
- HUC Code
- 18010102
Flood Stage Thresholds
- Action Stage
- 15.0 ft
- Flood Stage
- 22.0 ft
- Moderate Flood
- 24.0 ft
- Major Flood
- 28.0 ft
Currently 15.70 ft below flood stage.
Recent Extremes
- Max discharge
-
23,000 cfsDec 21, 2025
- Min discharge
-
48 cfsAug 30, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
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Little River near Trinidad CANormal7.0 mi · 18 cfs
-
Redwood C near Blue Lake CALow12.8 mi · 36 cfs
-
Elk River near Falk CAUnknown15.2 mi · 0 cfs
-
Trinity River at Hoopa CANormal22.4 mi · 2,200 cfs
-
Redwood C at Orick CANormal26.9 mi · 194 cfs