Flaming Gorge has some excellent boondocking/dry camping spots along the shore on the east side. There are two roads, one that goes on the east side and another on the west. We've been down both ways but did not stop to look at the reservoir. But after the Escapade this summer we are planning to drop down for a week or so of boondocking down there.
Check out this vBlog the Grand Adventure. Well worth subscribing to IMO.
On one side, I think the west but no totally certain, there are signs along the road informing you what geological era the rocks come from. That starts out in the PreCambrian at the sout end.
At the south end is Dinosaur NM which is open again and worth a stop.
