During the reconstruction of the dam, the contractor was adjusting the 36" headgate by lifting it with the backhoe on the barge and pulled it completely out of the guides. A plug was cast that would go in the lower end of the pipe and it was attached to a trackhoe and inserted into the pipe , kind of like the little Dutch boy with his finger in the dike. You can see the trackhoe at the base of the dam, it sat there for six weeks while a new headgate was cast and installed.
We were fortunate because in the process we discovered there was a hole in the old gate about the size of a pencil. Had they not pulled it out and the hole was found at a later date, we would have had to bring equipment back in to replace the gate.