It'll be good, very good! How do I know? 2500 is very good, 3900 is great, 7000 is easier than 3900 and lots of fun. 12000 is no different than 7000, just faster. The chance it's going to be less than 2000 or over 10000 is practically nil, and since everything in between is very good or better, you will have a great trip!
My weather prognostications are pretty good as well. It will be hot, dry and sunny. 80% Chance of upstream winds in the afternoon.
Don't Wanna Die Askin' for Another Chance