I understand, and perhaps "drinking schedule" was the wrong choice of words. I really just meant to encourage the OP to increase their fluid intake as they move to hotter weather. A strict "drinking schedule" probably isn't necessary, just whatever helps you drink more than usual. I don't actually set a timer that tells me to take a sip every ten minutes or anything like that, I just try to drink whenever it's convenient to grab for my bottle, even if I'm not feeling particularly thirsty.

Monitoring pee seems like an effective way to gauge this as well. Never really paid attention myself, but I can see the merit.

Last summer was my first time over Washington Pass. Great ride! I don't think it hit 105 for us; probably more mid to high 90's. 105 sounds rough! We went west to east, so looking at a map right now it looks like we rolled right past Lone Fir on our way down. I'm hoping to go east to west this summer, so it's good to know there is a water stop between Mazama and the top.