My experiences with forest service maps (except the ones you have to pay for) have left something to be desired, hopefully you have better luck with them than I. If you're ever up closer to Seattle, Kachess Lake is another nice spot (I took one of my favorite photos there so I'm a bit partial).
Wait, it gets up to 110 out there? Lol, elevation is lovely when it's hot and brutal when its not. I don't think you could ask for better hiking weather though; )