They should be posted on the site. When I went we just walked in, found the person, and he gave us a private tour.
When every you go there, they a flexible.
All of the above are true. When we went, there were three of us. We signed up and after we wandered around the museum for a bit, the gentleman took us on a tour of the locks and dam. Be aware of the weird little flies. They didn't bother me but one member of our party was freaked out. We found it all so fascinating. Big thanks to the staff there!
The last one is at 3pm they last around 45 minutes
When ever they have enough people that wanna join
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