At the mouth, Ilwaco, WA. Its 8 miles wide.
The widest part of the Columbia river would appear to be from the south channel of Cathlamet bay Oregon...to Gray's bay, Washington .... about 9.7 miles wide.
The Columbia River
idaho
1 mile
The Mississippi River is wider than the Columbia River. The Mississippi River varies in width along its course, but at its widest point near Alton, Illinois, it can reach over 3 miles wide. In comparison, the Columbia River is typically less than a mile wide.
The widest river in the world is the Amazon River. The second widest river in the world is the Nile River, which is the longest river in the world.
the widest river in fiji
At it's widest point the Danube River is 1.5km (0.93 miles(1,640 yards)) wide.
The River Severn is over 50 kilometers wide at its widest point near the city of Bristol. This is equal to about 31 miles.
The Columbia River forms a major part of the border between the states of Oregon and Washington.
Columbia river
Columbia river
The Columbia River