Walking to work through Winchester town center a few years ago, John Kilborn peered into the Mill Pond from the bridge on Main Street. He was stumped by a curious sight -- a fish was attempting to climb up the steps of the Center Falls Dam, but was unable to make the leap.Kilborn, who is a fisherman, didn’t recognize the fish right away, but after some research learned that what he saw was a river herring, attempting to bypass the dam on its way upstream toward spawning grounds [...]