What is the widest river in the US?
The widest delta for a river in the US is the Mississippi River, which also carries by far the most volume of any US river. The delta in southeastern Louisiana is about 20 to 25 miles wide where its various channels empty into the Gulf of Mexico.For a single channel, the Neuse River downriver from New Bern, NC is the widest river, about 5 miles wide where it enters Pamlico Sound.