Middle River is 71 miles long from its start near Summerdean to its confluence with the North River near Weyers Cave.
We have a map for you of the entire Middle River watershed. The Middle River Mile Marker Map shows each mile of the River. The mile markers start at 0 where Middle River flows into North River and end at 71 at the River's source near Summerdean.
It's a large PDF file (56 MB). We recommend that you download the map to your desktop so that you can use it any time to calculate distances along the River.