Roots of Motive Power in Willits, CA, is an all-volunteer organisation founded in 1982 dedicated to preserving and restoring steam as well as diesel powered equipment used in the California north coast logging industry from the 1850s to the present.
Every year, volunteers hold a Steam Festival, which is really a must-see if you're into any forms of steam power. I attended the September 2019 festival. Volunteers were very welcoming and informative, and I was free to roam throughout the site, including the workshops and sheds while various pieces of equipment were fired up for the day.
Once the day got going, there was a steam train to ride, cranes, donkeys and a traction engine all hissing and hooting at each other. There was also a BBQ and souvenirs on sale. It's a great day out for the kids and the kid in all of us.
I think these guys/gals are awesome and represent some of the very best of volunteer steam preservation in the US, keeping alive a key part of the nation’s history.