Does a stream require a certain width or volume before it can be classified as a river, and if so, what is it?
There's no official distinction between a river and a creek, both of which are categories of streams. As an example, consider Pine Creek in Pennsylvania and Po River in Spotsylvania County, Virginia. Pine Creek is 87.2 miles long and has a flow rate that ranges between 40 to 30000 cubic feet per second. Po River on the other hand is 1.9 miles long and has a row rate that ranges between less than 2 to 4000 cubic feet per second. The longer and larger one is called a creek while the shorter and smaller one is called a river.