Either way, rebuilding a dam, is no small project.
We have an old dam, revolutionary war era, that’s breached on the property. It’s big, 20’ high, 6’ wide. It was the iron furnace that everything around here is named for, furnace brook, furnace brook lake, furnace dock rd, furnace woods rd... apparently it was a big in the 1750s. We had a tropical storm (blanking on the name) about 15 years ago that dropped like 9” rain and ripped a huge section off the dam.