RedactedNarrative: On November 5th ,2017, I was contacted by part-time boating officer who was working a permitted rowing event on the river downtown Chattanooga. He stated that a vessel had drifted into the Walnut Street bridge causing damage to the vessel. The coast guard vessel also working during the event assisted the boat and towed it to the Erwin Marine dock. The operator of the vessel stated that he had pulled away from the dock and realized that the throttle system was not responding and drifted into the Walnut Street Bridge.