Stillwater River

The Stillwater is one of the great misnomers in Montana fly fishing — it is anything but still. Draining the north face of the Absaroka-Beartooth Wilderness, it drops out of alpine country as a fast, boulder-strewn freestone: pocket water, plunge pools, and Class II–III whitewater most of the way from Woodbine down to the Yellowstone at Columbus. The name is a mistranslation of a Crow word; the river itself is a wading angler's pocket-water puzzle, with trout holding in the slick behind every rock and the seam at the tail of every run. It fishes for wild rainbows and browns in real numbers, and it does it without the drift-boat crowds of the nearby Yellowstone.

Practically, the river fishes in three moods. Above Nye it is small, cold, and tumbling — hike-in pocket water full of eager but modest cutthroat, brook, and rainbow trout that aren't fussy about the fly. From Nye down to Absarokee it opens into the heart of the fishery: clearer water, endless pocket water and fast runs, wild browns that average 12–14 inches with fish over 20 possible, and rainbows around a foot. Below Absarokee, where West Rosebud Creek comes in and adds some color, it mellows, speeds up over cobble, and turns into a dry-dropper numbers game down to the Columbus confluence.

The whole thing keys off snowmelt. It blows out big and dirty during Beartooth runoff — routinely well over 3,000 CFS in June — and doesn't settle into shape until flows drop through late June. The window from July into September is the sweet spot: salmonflies and golden stones below Nye in late June and early July, caddis nearly every evening, yellow sallies and PMDs through summer, then hoppers carrying August and September. It's wadeable throughout, but the footing is genuinely slick and the current pushy — felt or good rubber and a wading staff earn their keep. Access is good by Montana standards, with a string of FWP Fishing Access Sites lining the Nye–Absarokee road, and it's an easy 45–60 minute drive southwest of Billings that most out-of-state anglers drive right past on their way to the Yellowstone.