Rivermatics

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 sits on the Tualatin River, alongside 4 other gauges Rivermatics tracks on the same river. 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. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead.

View live conditions & forecast →

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)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Tualatin River at West Linn, OR. Each day carries a median estimate and the band the model expects the flow to fall within — not a single number to plan against. Forecasts are re-issued daily; see the live screen for the current outlook.

Forecast daily mean discharge in cubic feet per second, by date
Date Low p10 Expected p50 High p90 Range
252 259 265
244 258 290
240 269 341
234 263 321
227 254 300
221 246 287
214 239 277
210 234 271
207 232 269
204 230 268
202 228 267
201 227 263
198 224 261
197 223 260

All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.

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.

Historical monthly discharge percentiles in cubic feet per second
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).

Common questions

When does Tualatin River at West Linn, OR normally run highest?
January, on the long-term record. The median daily flow that month is about 3,496.5 cfs, against 82 cfs in August, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Tualatin River at West Linn, OR?
It depends on the month. In January, half of days historically fall near 3,496.5 cfs, with the middle 80% of days between 891.5 and 7,405.8 cfs. The month-by-month table on this page gives the full range.
How long has Tualatin River at West Linn, OR been measured?
Discharge records at USGS site 14207500 begin in 1928, about 98 years, covering roughly 9,200 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Tualatin River at West Linn, OR?
Yes. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on this basin's observed flows, weather, and snowpack, and issues a daily flow outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. Every forecast is scored against days the model never trained on, and that track record is published on the live gauge screen. Open live conditions to see the current outlook.
Where is Tualatin River at West Linn, OR?
The gauge sits at 45.35068, -122.6762, in Oregon, in hydrologic subbasin 17090010, draining roughly 706 square miles.
Can I use Tualatin River at West Linn, OR data for flood or safety decisions?
No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.

Upstream and downstream on the Tualatin River

Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Tualatin River in full.

Other gauges in this subbasin