Yeah things are definitely low now, but they will be up by a lot come 5/28 and it definitely won't be drying up. That being said, they won't be anywhere near last years levels obviously. Certainly it is totally impossible to know for sure but I would guess that flow is somewhere between 8,000-12,000 cfs for your trip. Also, I've done Westwater down to 2,400 cfs and it was actually one of my favorite flows, the left side of last chance at that flow is awesome. I can pretty much promise you'll have at least double that flow though. I'm just saying try not to look at the low flows as a bad deal, pretty sweet opportunity to run the river at levels it rarely sees if you ask me.