This underrated river in the Mid-Atlantic is one of the oldest rivers on Earth—and a superb outdoor destination right in the US.

Many people assume the longest river in the U.S. is the Mississippi, but that title belongs to the Missouri and part of American agriculture history.

Note: Map contains unchecked data from automatic equipment. Please remember to refresh page so the data is up to date. Move mouse over station for more data.

Note: Map contains unchecked data from automatic equipment. Please remember to refresh page so the data is up to date. Move mouse over station for more data.