Tualatin River at West Linn, OR
USGS Site No: 14207500 • Tualatin River • Clackamas County, OR
Tualatin River at West Linn, OR on the Tualatin River is currently at 329 cfs (Normal — 63th percentile for this date) . Gage height: 3.24 ft.
Reading from
Historical Percentile Comparison
Today's discharge compared to the long-term record for October 27 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 | 55 | |
| 25th | Low threshold | 109 | |
| 50th (Median) | Normal (median) | 257 | |
| 75th | High threshold | 400 | Today: 329 cfs |
| 95th | Very High threshold | 1,210 |
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 | 372 | — |
| May 27, 2026 | 382 | — |
| May 26, 2026 | 370 | — |
| May 25, 2026 | 338 | — |
| May 24, 2026 | 313 | — |
| May 23, 2026 | 312 | — |
| May 22, 2026 | 331 | — |
| May 21, 2026 | 358 | — |
| May 20, 2026 | 399 | — |
| May 19, 2026 | 454 | — |
| May 18, 2026 | 486 | — |
| May 17, 2026 | 443 | — |
| May 16, 2026 | 426 | — |
| May 15, 2026 | 420 | — |
| Apr 20, 2026 | 1,320 | — |
| Apr 19, 2026 | 1,540 | — |
| Apr 18, 2026 | 1,810 | — |
| Apr 17, 2026 | 2,020 | — |
| Apr 16, 2026 | 1,820 | — |
| Apr 15, 2026 | 1,280 | — |
| Apr 14, 2026 | 909 | — |
| Apr 13, 2026 | 1,020 | — |
| Apr 12, 2026 | 1,000 | — |
| Apr 11, 2026 | 833 | — |
| Apr 10, 2026 | 702 | — |
| Apr 9, 2026 | 730 | — |
| Apr 8, 2026 | 779 | — |
| Apr 7, 2026 | 821 | — |
| Apr 6, 2026 | 861 | — |
| Apr 5, 2026 | 933 | — |
Station Information
- USGS Site No
- 14207500
- State
- OR
- County
- Clackamas County
- Coordinates
- 45.3507, -122.6762
- Drainage Area
- 706 mi²
- Datum (ft)
- 85.6
- HUC Code
- 17090010
Flood Stage Thresholds
- Action Stage
- 11.0 ft
- Flood Stage
- 13.5 ft
- Moderate Flood
- 14.5 ft
- Major Flood
- 15.0 ft
Currently 10.26 ft below flood stage.
Recent Extremes
- Max discharge
-
6,420 cfsMar 18, 2026
- Min discharge
-
200 cfsOct 18, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Fanno Creek at Durham, ORNormal5.3 mi · 7 cfs
-
Molalla River Near Canby, ORNormal7.4 mi · 241 cfs
-
Chicken Creek above Seasonal Trail, near Sherwood, ORLow8.2 mi · 0 cfs
-
Pudding River at Aurora, ORNormal8.9 mi · 202 cfs
-
Fanno Creek at 56th Ave, at Portland, ORNormal9.9 mi · 0 cfs