Tualatin River Flow
As of 2026-08-11, the Tualatin River is flowing at a combined 443 cfs across 2 USGS streamgauges — 144% of normal for this time of year, versus a seasonal average of 307 cfs.
Total streamflow across the Tualatin River was last observed at 443 cfs, and is expected to yield approximately 879 acre-ft of water today; about 144% of normal. River levels are high. Average streamflow for this time of year is 307 cfs, with recent peaks last observed on 2015-12-12 when daily discharge volume was observed at 15,370 cfs.
Maximum discharge along the river is currently at the Tualatin River Near Dilley reporting a streamflow rate of 219 cfs. This is also the highest stage along the Tualatin River, with a gauge stage of 11.6 ft at this location. This river is monitored from 2 different streamgauging stations along the Tualatin River, the highest being situated at an altitude of 168 ft, the Tualatin River Near Dilley.
River streamflow levels
Daily aggregate streamflow across every monitored gauge along the Tualatin River. Use the range buttons to zoom in on a specific period.
Total streamflow
Sum of all monitored streamgauges · daily
Every streamgauge along the Tualatin River
All 2 USGS gauges Snoflo tracks for this river, with current flow, stage, recent change, percent of normal, and the gauge's all-time min / max. Click any header to sort. Cells are heatmapped relative to the column min/max -- darker blue = higher.
| Streamgauge▾ | Streamflow (cfs)▾ | Gauge stage (ft)▾ | 24h Δ (%)▾ | % Normal▾ | Min (cfs)▾ | Max (cfs)▾ | Elevation (ft)▾ |
|---|---|---|---|---|---|---|---|
|
Tualatin River Near Dilley
OR
USGS 14203500
|
219 | 11.60 | 2.3 | 98% | 51 | 3,400 | 168 |
|
Tualatin River At West Linn
OR
USGS 14207500
|
213 | 2.89 | 0.0 | 101% | 143 | 13,900 | 110 |
Maximum streamflow discharge by year
The single highest aggregate discharge recorded each year. Spotting the multi-year trend reveals droughts vs. wet cycles long before the headline daily flow does.
Annual peak discharge
From the river's full record · one point per water year
Streamflow elevation profile
Each bubble is one gauge along the river, plotted by current streamflow (x-axis) vs elevation (y-axis), sized by gauge stage. Reading top-to-bottom traces the river from headwaters down to its mouth -- you can see flow accumulate as elevation drops.
Elevation vs streamflow
One point per monitored gauge · bubble size = gauge stage
Tualatin River
The Tualatin River is a 83-mile long river located in Oregon, United States. It has a rich history, being home to indigenous people for thousands of years, and later used by early pioneers for transportation and agriculture. The river's hydrology is heavily influenced by precipitation and snowmelt, with flow peaking in the winter months. The river is impounded by several dams, including the Hagg Lake Dam and Barney Reservoir Dam, which provide flood control and recreational opportunities. The river is also used for agricultural purposes, with many farms located along its banks. Recreational activities include fishing, boating, and wildlife viewing. Despite ongoing efforts to improve water quality, the river has been plagued by pollutants in the past, and remains a focus of conservation efforts.
Recreation along the Tualatin River
Fishing access and paddle runs Snoflo tracks within the watershed.
Track the Tualatin River in the Snoflo app
Set per-gauge push alerts (e.g. "alert me when flow at the Russian R Nr Healdsburg crosses 5,000 cfs"), and Snoflo's iOS app pushes the moment USGS reports the crossing.
About the Tualatin River
How is the Tualatin River flowing right now?
As of 2026-08-11, the Tualatin River is flowing at a combined 443 cfs across its USGS streamgauges, about 144% of normal for this date. The live per-gauge breakdown and 24-hour trend are shown above.
Is the Tualatin River running high or low right now?
Check the percent-of-normal figure on this page: above 100% means the river is running higher than its seasonal average for the date, below 100% means lower. The per-gauge table shows which reaches are highest and lowest.
Where does the data for the Tualatin River come from?
Streamflow and gauge stage data are sourced from the U.S. Geological Survey (USGS) National Water Information System. The aggregate flow shown at the top of the page is computed by Snoflo as the sum of all monitored gauges along the river.
How is "percent of normal" calculated?
Today's aggregate streamflow is compared to the historical average aggregate streamflow on this calendar day across the river's full record. 100% means right on average; values above 100% indicate above-normal flow (wet year); values below indicate below-normal (dry year or drought).
Why are some gauges showing very different flows?
Gauges along a river measure flow at different points: headwater gauges read what's coming off the snowpack or mountain runoff; downstream gauges integrate everything upstream, including tributary inputs. Wide spreads usually mean a tributary is contributing significantly between gauges.
What's the elevation profile chart showing?
Each bubble is one gauge along the river, plotted by streamflow (x-axis) and elevation (y-axis), sized by gauge stage. Reading top-down traces the river from headwaters to mouth -- you can see flow build as elevation drops.
Can I get alerts when a specific gauge crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app on a per-gauge basis. Open any individual streamgauge from the table above and favorite it to set a discharge threshold.