Columbia river
The Columbia River forms part of the border between Washington State and Oregon. Both of these states are West of the Mississippi River.
I'd have to guess the Columbia, running east to west between Washington and Oregon, emptying in to the Pacific Ocean.
If you mean the Columbia River along the Oregon/Washington border, The river rises in the Rocky Mountains in British Columbia, Canada, flows northwest and then south into the U.S. state of Washington, then turns west to form most of the border between Washington and the state of Oregon before emptying into the Pacific Ocean.
The Columbia River starts in the Canadian Rockies in the Province of British Columbia and then runs south into the State of Washington. It then runs west along the majority of the border between the states of Oregon and Washington until it empties into the sea near Astoria, Oregon.
The Columbia River borders most of the length between Washington & Oregon.
The capitol of Oregon is Salem.
The Columbia river starts high up in the Canadian Rockies, in the Province of British Columbia. It turns south, down through the state of Washington, where it then turns West, and forms the boarder between Washington and Oregon. The river empties into the Pacific Ocean.
Virginia Maryland West Virginia
That river would be the mighty Columbia.Roll on Columbia, roll on!
Washington state, Oregon and California.
The Snake river flows east for part of its course and the water eventually flows into the Pacific Ocean. It forms part of the border between Idaho and Oregon The Columbia river forms most of the border between Washington and Oregon, but the water in it flows WEST, so unless you meant something like "runs in an east-west direction" the Columbia is not the river you are looking for.
The Columbia River flows from British Columbia, through Washington State and then creates the border between Washington and Oregon before flowing into the Pacific Ocean The river rises in the Rocky Mountains in British Columbia, Canada, flows northwest and then south into the U.S. state of Washington, then turns west to form most of the border between Washington and the state of Oregon before emptying into the Pacific Ocean.