A walkway atop the central water channel in one of the tailraces. Side tunnels led off to other flooded tailraces. The ceiling was about 7 feet up, water was about 5 or 6 feet down, and of an unknown depth (more than 5 feet).
At the end of a tailrace, up inside the guts of a mill. This particular mill has been refurbished above, leaving a sealed crawlspace with an original floor, new ceiling, and lots of odd machinery and junk trapped in between. There are also a lot of rats, the only (live) ones I saw in or under the Twin Cities. The last photo poorly illustrates the really dodgy shaft down from the mill basement into the tailraces, a several floor drop through rusty gears, pipes, cables, and other random machinery. If you look closely you might make out some stairs way down there.
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