Tualatin River

Total streamflow across the Tualatin River was last observed at 1,650 cfs, and is expected to yield approximately 3,273 acre-ft of water today; about 78% of normal. Average streamflow for this time of year is 2,129 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 1,230 cfs. However, the streamgauge with the highest stage along the river is the Tualatin River Near Dilley with a gauge stage of 11.63 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.

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.