191 north of Vernal, UT has around 8 or 9 steep switchbacks at 8% grade if I remember correctly. If you are going north into Wyoming, you will be going uphill. Beware of fast dump trucks hauling gypsum from the Simplot mine close by Vernal. There was a MH driven by a scared guy that had his hazards blinking the whole way driving about 10 mph. We stopped at all the overlooks then caught up again. Once on the flats, he sped up. Scared or bad brakes? We were going downhill heading south.
While in the area, you will probably take a detour to Dinosaur National Monument where you can see a large excavation wall with embedded dinosaur bones (this is not a fake, an in situ display) and you can touch several of the bones. How cool is that? Brought out the kid in me. Also, just before Wyoming, there is Flaming Gorge National Recreation Area (a campground or two) where there are signs along the road that tell you about the different layers (geology, era, creatures, etc.). Fuel, groceries, etc. in Green River and Rock Springs (an oil boom town) on I70.
If you are interested in rock art, check out Nine MIle Canyon which is actually 40+ miles of canyon. It is paved until you get the famous Hunt Scene. It was curvy but not that much traffic. At one parking lot stop for a walk through a canyon to see rock art, you have a modern power plant (I think or something industrial, gas I think), an old corral and the rock art. Interesting juxtaposition. Up until a few years ago, the road was gravel, but the power company paved it so a passenger car can travel to see this treasure trove.
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