On the Steam Boat Tunnel, I think the adit in the Pic is the lower one by the buildings? You have to go up stream a few hundred yards, to get to the drain adit of the tunnel. They are connected. I think the one bricked off was the haul adit. I don’t think they would have destroyed the cemented adit with the drain pipe. If I remember right, we were surprised to find it and be able to get in. A few years later we went back and the grate was secured in place and would take a lot of work to get around. I think I have photos of it and will post them.
Danb
Danb
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