A repost by the Professor.

That’s right, fatbiking the river, in Winter, when it’s frozen. This looks like loads of fun. The exploration options look pretty limitless. Now I’m thinking about new Winter trips, but I confess, it does look kind of scary. But I guess if they are out there ice fishing on it, it should be okay.  Of course, riding on ice like that, I would want studded tires.

http://universalklister.blogspot.fi/2014/01/proving-theory-fat-biking-flaming-gorge.html