I just thought I'd drop in and let you know that I work with a girl whose family owned the mill, surrounding land, and is the namesake for the mill and bridge. Her family still owns a fair amount of the ajacent land. Her grandfather who was nicknamed rooster, and went by "roost" carved his name in the bridge. You can see it in the last photo on the support to the left of "Kate + John".
I knew she was from Cowden, so I asked about the bridge when I came across the pictures in your thread. She proceeded to tell me all about the bridge and mill.
Great thread! It is a small world.