Spruce moths are here! This is one of the brights spots in the dog days of summer. Get up in the Canyon towards Big Sky and bring your big, Size 10/12 tan caddis dries. Not cooperating on the dry? Maybe drop a small, shiny nymph off the back. Still not doing it for ya? Go deep with a stonefly-dropper nymph rig. Once again, early bird with a good drift gets the worm. And don't overlook the secondary spots!
Also, keep in mind that you cannot fish after 2 p.m. downstream of Four Corners per the Hoot Owl restrictions put in place by Montana FWP. No matter, the water temps are nice and cool up in the Canyon.
Flies: anything spruce moth (big caddis), copper johns, lightning bug, prince nymph, stimulators, rubberlegs