This ride sounds like a helluva lot of fun!
May 6 we rode the Cedar Cross 100, in Jefferson City MO.
116 miles. Mostly gravel, with about 10 miles of singletrack. The singletrack was a bit much for our "gravel grinder tandem". We ended up walking a bunch. Lots of soft mud & trails too tight to maneuver the tandem through. The gravel was GREAT! Lots of it, with plenty of good hills.