My husband works for state parks and used to do the tours as the miller. I have seen 3 or 4 tours from others and some are better than others (longer too) but they are all good. This is a very interesting era of California history when wheat was grown in the Napa Valley. Recently more of the mill was restored and seeing it run is pretty cool. They only mill (run the water wheel) on the weekends, and it is the largest working mill west of the mississippi. You will learn the many sayings that come from milling. You can "mill around" as much as you want before or after the tour, even bring a lunch- it's nice country. The gift store has postcards, recipes and polenta, wheat etc. from the mill.
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