Napa River near St Helena CA
USGS Site No: 11456000 • Napa River • Napa County, CA
Napa River near St Helena CA on the Napa River is currently at 13 cfs (High — 86th percentile for this date) . Gage height: 1.67 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 | 0 | |
| 25th | Low threshold | 0 | |
| 50th (Median) | Normal (median) | 1 | |
| 75th | High threshold | 3 | |
| 95th | Very High threshold | 21 | Today: 13 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 | 15 | — |
| May 27, 2026 | 15 | — |
| May 26, 2026 | 13 | — |
| May 25, 2026 | 14 | — |
| May 24, 2026 | 13 | — |
| May 23, 2026 | 13 | — |
| May 22, 2026 | 13 | — |
| May 21, 2026 | 13 | — |
| May 20, 2026 | 14 | — |
| May 19, 2026 | 14 | — |
| May 18, 2026 | 14 | — |
| May 17, 2026 | 15 | — |
| May 16, 2026 | 16 | — |
| May 15, 2026 | 17 | — |
| Apr 20, 2026 | 30 | — |
| Apr 19, 2026 | 20 | — |
| Apr 18, 2026 | 22 | — |
| Apr 17, 2026 | 23 | — |
| Apr 16, 2026 | 26 | — |
| Apr 15, 2026 | 30 | — |
| Apr 14, 2026 | 34 | — |
| Apr 13, 2026 | 50 | — |
| Apr 12, 2026 | 79 | — |
| Apr 11, 2026 | 46 | — |
| Apr 10, 2026 | 29 | — |
| Apr 9, 2026 | 15 | — |
| Apr 8, 2026 | 15 | — |
| Apr 7, 2026 | 15 | — |
| Apr 6, 2026 | 16 | — |
| Apr 5, 2026 | 17 | — |
Station Information
- USGS Site No
- 11456000
- State
- CA
- County
- Napa County
- Coordinates
- 38.5113, -122.4558
- Drainage Area
- 79 mi²
- Datum (ft)
- 191.3
- HUC Code
- 18050002
Flood Stage Thresholds
- Action Stage
- 16.0 ft
- Flood Stage
- 18.0 ft
- Moderate Flood
- 20.0 ft
- Major Flood
- 22.0 ft
Currently 16.33 ft below flood stage.
Recent Extremes
- Max discharge
-
1,600 cfsJan 5, 2026
- Min discharge
-
0 cfsDec 5, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Sonoma Creek at Kenwood CAVery High8.6 mi · 2 cfs
-
Pope C at Walter Springs CAUnknown10.6 mi · 0 cfs
-
Napa River near Napa CAHigh12.9 mi · 28 cfs
-
Sonoma C at Agua Caliente CAHigh13.2 mi · 11 cfs
-
Nathanson C at Sonoma CAUnknown15.9 mi · 0 cfs