>>908732Salt Flats are neat, but I should warn you that parts of your route may not exist. At least look at google earth in that area beforehand. I think part of that route is covered here:
http://thetrekplanner.com/newfoundland-mountains-east-mines/As far as I'm aware, brown is a (potentially potholed) dirt road next to the bombing range, so don't expect to stop or get off the road there. Orange is a gravel road next to the railroad causeway. I'm unsure how UP feels about maintaining it. Black is either across the middle of evaporation pond from when Utah pumped the lake out into the desert in the 80s, or is the dirt road from the Newfoundland Mountains across the bombing range. In either case, it's subject to seasonal flooding and may contain bomb craters, and probably isn't a place the military wants you to be. This is the part that concerns me the most. You're also going a long way out of your way to see what is, ultimately, just a very flat and salty piece of ground. What time of year would you be there? It's often underwater in the spring, and I suspect you want to drive your motorcycle on the flats since you're making such a big detour for them.
>I live in SLC and spent a fair amount of time in the west desert, although I haven't made it to the area in question yetSince you'll be in southeastern Utah, it might be worth looking into the LaSal mountain loop/ I assume you're aware of the numerous national parks in the area. If you pass through Moab, Dead Horse Point state park is gorgeous. It's not as deep as the grand canyon, but the river is much more directly below you.