Has anyone ever ridden near Magone Lake or along the Nipple Butte trail in Malheur National Forest? This is near John Day.

I hunt deer in this area in the Fall and always thought it would be fun to come back in the summer with my MTB. Maps show a "Magone Bike Area" but I've never seen a review. I am also interested in the Nipple Butte trail, which is open to bikes and has a trailhead near Keeney Meadows (my typical hunting grounds).