Rivermatics

USGS Streamgage 14206241

Tualatin River at Hwy 219 near Hillsboro, OR

Tualatin River at Hwy 219 near Hillsboro, OR is USGS streamgage 14206241 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 462 square miles. Discharge records at this site go back to 2019. Typical flow runs near 155.4 cfs in July and 1,460.4 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, alongside daily high and low water-temperature forecasts.

View live conditions & forecast →

Gauge details

State
Oregon
Drainage area
462 sq mi
Subbasin (HUC-8)
17090010
Coordinates
45.50039, -122.99094
USGS site number
14206241
Records begin
2019-04-18 (7 years)
Rivermatics forecast
14-day flow outlook + water temperature

14-day flow forecast

Based on observations through for Tualatin River at Hwy 219 near Hillsboro, 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
129 134 141
130 139 161
133 151 190
131 148 187
127 143 173
123 138 165
118 133 154
116 131 151
116 132 161
112 128 150
109 126 146
108 125 146
107 124 144
107 124 145

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 4 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 — 2,545.9 —
February — 980.1 —
March — 2,357.7 —
April — 1,460.4 —
May — 722.7 —
June — 250.5 —
July — 155.4 —
August — 153.5 —
September — 166.7 —
October — 140 —
November — 665.1 —
December — 1,597.4 —

All values in cubic feet per second (cfs).

Common questions

When does Tualatin River at Hwy 219 near Hillsboro, OR normally run highest?
January, on the long-term record. The median daily flow that month is about 2,545.9 cfs, against 140 cfs in October, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
How long has Tualatin River at Hwy 219 near Hillsboro, OR been measured?
Discharge records at USGS site 14206241 begin in 2019, about 7 years, covering roughly 2,668 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 Hwy 219 near Hillsboro, 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. A companion model forecasts each day's water-temperature high and low. 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 Hwy 219 near Hillsboro, OR?
The gauge sits at 45.50039, -122.99094, in Oregon, in hydrologic subbasin 17090010, draining roughly 462 square miles.
Can I use Tualatin River at Hwy 219 near Hillsboro, 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