Another kind of "soup"....
In looking at my atlas, I see that it's the Fox River that is nearby, not the Rock. I don't know where the Rock River is I guess. I thought it was in Illinois - Rockford maybe? ...and that it also is in Wisconsin somewhere. I do know that the communities along the western shore of Lake Winnebago are in the Fox River Valley, but thought that river went farther west from there. Oh well...