I'm riding my first SR600 this coming weekend - Oregon Six Passes SR600. To compound things, I'm the new route owner. The previous owner isn't involved anymore, and it start/finishes about a mile from my house. Right off the bat I find out a 30 mile stretch is National Forest roads closed since the 2020 White River fire. I spent the entire weekend working on a detour that meets the criteria for distance and elevation. That included six hours driving out to that segment and scouting roads. I've ridden probably half the route in the past, and now I've driven another quarter. This is going to be a beast; I'm pretty intimidated.
https://ridewithgps.com/routes/37161143
The eastern half is desolate, dry, and will likely be either blazing hot or cold and windy. Maybe both. Limited cell phone service on much of the ride, and some long stretches with no services. Where there are services, it's often one place.