no because then it would be classified as a pudding river. Not a river.
rice pudding
they ate his chocolate pudding
Columbia River is north of Oregon. - Lea
the Umatilla river
The Willamette River is the longest river "in" the State of Oregon. The Columbia and Snake are both much longer but are not completely "in" the State of Oregon.
The Grammart river flows north, and it is in Oregon.
Washington and Oregon border the Columbia River.
The Columbia River separates Washington State and Oregon.
Columbia River, Oregon.
If you mean Oregon and Washington, you'd be looking for the Columbia River...
The Sandy river and the Columbia river in Oregon
The Snake River forms part of Oregon's eastern border