I'm absolutely not the type tp spend hours in gloomy, dusty museum halls - this place is anything but. albeit small, it is packed with very interesting displays centered around Powell and his river discovery trips, as well as the history of the area, so closely tied to the river. Some of the info boards are even outdoors. There is also a really nice gift store with tasteful merchandise.
If you pass through Green River anyway, give this an hour or so, it's really worth it.
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