I drove out there last Saturday - posted about it in the Newbie forum, however I probably should have posted here in the Route Reports / Access.
Anyway, the downed tree is about 50 yards before road 020 crosses 80. You can't really tell from the picture, but it's probably about 4 foot in diameter, so it's a pretty large tree. I was able to get around to the east but the snow was pretty deep, 3 feet or so in spots.
My friend took a short video going back around the log:
http://www.flickr.com/apps/video/stewart.swf?v=71377&photo_secret=ba6f3818ac&photo_id=4287783363