USGS Streamgage 14207500
Tualatin River at West Linn, OR
Tualatin River at West Linn, OR is USGS streamgage 14207500 in Oregon, monitoring river discharge in hydrologic subbasin 17090010. It drains a watershed of about 706 square miles. Discharge records at this site go back to 1928. Typical flow runs near 135 cfs in July and 1,293.3 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Oregon
- Drainage area
- 706 sq mi
- Subbasin (HUC-8)
- 17090010
- Coordinates
- 45.35068, -122.6762
- USGS site number
- 14207500
- Records begin
- 1928-08-01 (98 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 97 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.
| Month | Low p10 | Typical p50 | High p90 | Range |
|---|---|---|---|---|
| January | 891.5 | 3,496.5 | 7,405.8 | |
| February | 908 | 2,956.9 | 6,819 | |
| March | 924.7 | 2,324.2 | 5,396.1 | |
| April | 596.5 | 1,293.3 | 3,171.7 | |
| May | 315 | 567.2 | 1,325.5 | |
| June | 128.6 | 274 | 593.8 | |
| July | 22.2 | 135 | 277.6 | |
| August | 5.5 | 82 | 241.1 | |
| September | 8.3 | 114.9 | 304 | |
| October | 30.7 | 181.1 | 519.9 | |
| November | 143.9 | 699.4 | 2,793 | |
| December | 456.5 | 2,376.1 | 6,624.8 |
All values in cubic feet per second (cfs).
Other gauges in this subbasin
- Chicken Creek at Scholls-Sherwood Hwy, Sherwood, OR
- Scoggins Creek near Sw Old Hwy 47, near Gaston, OR
- Rock Creek at Brookwood Avenue, Hillsboro, OR
- Gales Creek at Old Hwy 47, Forest Grove, OR
- Wapato Canal at Pump House, at Gaston, OR
- Wapato Creek at Sw Gaston Road, at Gaston, OR
- Scoggins Creek below Henry Hagg Lake, near Gaston, OR
- Tualatin River near Dilley, OR