San Lorenzo River at Big Trees CA
USGS Site No: 11160500 • San Lorenzo River • Santa Cruz County, CA
San Lorenzo River at Big Trees CA on the San Lorenzo River is currently at 46 cfs (Very High — 96th percentile for this date) . Gage height: 3.72 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 | 11 | |
| 25th | Low threshold | 15 | |
| 50th (Median) | Normal (median) | 19 | |
| 75th | High threshold | 24 | |
| 95th | Very High threshold | 44 |
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 | 61 | — |
| May 27, 2026 | 42 | — |
| May 26, 2026 | 41 | — |
| May 25, 2026 | 42 | — |
| May 24, 2026 | 42 | — |
| May 23, 2026 | 42 | — |
| May 22, 2026 | 43 | — |
| May 21, 2026 | 43 | — |
| May 20, 2026 | 44 | — |
| May 19, 2026 | 45 | — |
| May 18, 2026 | 46 | — |
| May 17, 2026 | 47 | — |
| May 16, 2026 | 47 | — |
| May 15, 2026 | 49 | — |
| Apr 20, 2026 | 97 | — |
| Apr 19, 2026 | 64 | — |
| Apr 18, 2026 | 67 | — |
| Apr 17, 2026 | 70 | — |
| Apr 16, 2026 | 74 | — |
| Apr 15, 2026 | 79 | — |
| Apr 14, 2026 | 86 | — |
| Apr 13, 2026 | 105 | — |
| Apr 12, 2026 | 170 | — |
| Apr 11, 2026 | 131 | — |
| Apr 10, 2026 | 66 | — |
| Apr 9, 2026 | 52 | — |
| Apr 8, 2026 | 52 | — |
| Apr 7, 2026 | 53 | — |
| Apr 6, 2026 | 56 | — |
| Apr 5, 2026 | 59 | — |
Station Information
- USGS Site No
- 11160500
- State
- CA
- County
- Santa Cruz County
- Coordinates
- 37.0444, -122.0725
- Drainage Area
- 106 mi²
- Datum (ft)
- 230.1
- HUC Code
- 18060015
Flood Stage Thresholds
- Action Stage
- 14.0 ft
- Flood Stage
- 16.5 ft
- Moderate Flood
- 19.5 ft
- Major Flood
- 21.8 ft
Currently 12.78 ft below flood stage.
Recent Extremes
- Max discharge
-
1,490 cfsFeb 19, 2026
- Min discharge
-
16 cfsSep 1, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
San Lorenzo River at Santa Cruz CAHigh4.3 mi · 46 cfs
-
Soquel C at Soquel CAHigh7.4 mi · 13 cfs
-
Aptos C near Aptos CAUnknown9.6 mi · 0 cfs
-
Saratoga C at Saratoga CAVery High14.6 mi · 4 cfs
-
Corralitos C at Freedom CAHigh18.2 mi · 2 cfs