Yes, in a way because the Columbia river flows halfway on the border of Oregon and Washington, therefore dividing the states.
Washington and Oregon border the Columbia River.
Columbia river
Columbia River
If you mean Oregon and Washington, you'd be looking for the Columbia River...
The Columbia River.
Columbia River
The Columbia River divides Washington and Oregon. The Columbia River is the largest river, at 1,240 miles, that flows into the Pacific Ocean.
The Columbia River.
The Columbia River separates Washington State and Oregon.
Columbia river
That would be the Columbia River. This river separates approximately two thirds of southern Washington from northern Oregon. At a place on the 46th parallel north this river total enters the state of Washington, and this parallel becomes the border line that separates the two states.
Potomac River