The Metolius River is going to be a great place to be this week. In the next few days you’ll see cool weather and a high likelihood of rain today, and monday and tuesday. Don’t let that discourage you at all! Get there now, these summer rain days can get the bull trout in the mood (so to speak) and also make the mayfly hatches go crazy. Look for better than average PMD and Blue Wing OIives, hopefully Green Drakes too. Caddis and stoneflies might slow down a little, but I would still put a high priority on caddis pupa, especially tan #14-16 fat caddis, primetime pupa, sparkle pupa and prairie doggin’ pupa. 
When the weather gets rainy the mayfly duns might take a lot longer to take flight, and in fact the entire emergence process might take a lot longer so really pay attention to emergers like the film critic and captive dun, add some sparkle duns and true dry flies like a comparadun and parachutes and keep an eye peeled on rusty spinners earlier than dusk for cooler days, and later this week when the warmth returns to Oregon by Thursday. 
My friend Damon had some good fishing on Clark’s Stones, and another customer had some good fishing on Norm Woods Special, so look out for some early golden stones no matter what area of the river you visit. I won’t spill their secrets but they couldn’t have been further apart on the river and the fish wanted to eat the bigger stones. Keep an eye on the stones and know they are going to come on stronger and stronger soon. 
With this front coming through try a natural pine squirrel leech nymphed dead drift and swung. Rain can make the bull trout get frisky and that is a great summer rainy day fly. 
Of course there is always a good excuse to nymph the Met, either with an indicator or on a euro/tight line rig. Perdigons, Frenchies, Walts Worms, Soft Hackle PT, Caddis Pupa, Green Drake Nymphs and Golden Stones are top picks for the whole month of June. 
PS- while I wrote this report I got another message from John S, a regular reporter to me and his success on the clarks stone too. And the improved fat ass caddis. Both are good oregon patterns, one invented by Lee Clark and one by some fella in Sisters named Jeff.