There was a Wordpress blog, which disappeared. I did later find a replacement blog post that mentioned a community oven in Nevada City, California.
The post says in part:
The Bluebird Farm contingency has decided to revive the Thursday night summer potlucks……..only they have centered the gathering around a communal bread bake. They have built a cobb oven at the Wet Hill Road homestead off Cement Hill Road. A cobb oven is a wood fired oven made from clay and straw.I did find a Wet Hill Road off of Cement Hill Road. Looking for information about Bluebird Farm turned up a page with a picture, which links to a page with some directions, but not to anyplace on Wet Hill Road.
I did add a section heading in the community oven links page for this oven. It's on the community oven map as well.