Tualatin River River Levels

Last Updated: December 23, 2025

The Tualatin River is a 83-mile long river located in Oregon, United States.


Summary

Total streamflow across the Tualatin River was last observed at 7,250 cfs, and is expected to yield approximately 14,380 acre-ft of water today; about 168% of normal. River levels are high. Average streamflow for this time of year is 4,319 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 At West Linn reporting a streamflow rate of 6,120 cfs. However, the streamgauge with the highest stage along the river is the Tualatin River Near Dilley with a gauge stage of 16.47 ft. 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 Details

Last Updated 2025-12-23
Discharge Volume 14,380 ACRE-FT
Streamflow 7,250.0 cfs
+160.0 cfs (+2.26%)
Percent of Normal 167.87%
Maximum 15,370.0 cfs
2015-12-12
Seasonal Avg 4,319 cfs
       
River Streamflow Levels
Streamgauge Streamflow Gauge Stage 24hr Change (%) % Normal Minimum (cfs) Maximum (cfs) Air Temp Elevation
Tualatin River Near Dilley
USGS 14203500
1130 cfs 16.47 ft -10.32
Tualatin River At West Linn
USGS 14207500
6120 cfs 9.44 ft 4.97
Seasonal Discharge Comparison
Maximum Streamflow Discharge
Streamflow Elevation Profile

The Tualatin River is a tributary of the Willamette River in Oregon in the United States. The river is about 83 miles (134 km) long, and it drains a fertile farming region called the Tualatin Valley southwest and west of Portland at the northwest corner of the Willamette Valley. There are approximately 500,000 people residing on 15 percent of the land in the river's watershed.