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The Ruby River stands out for grayling-angling due to its successful reintroduction of native Arctic grayling in the upper 41 miles above Ruby Reservoir, a rare conservation win after extirpation in the early 1900s. Cold, low-gradient waters with minimal non-native competition foster natural reproduction, yielding fish up to 20 inches with brilliant iridescent fins. Light angling pressure keeps grayling eager compared to busier Montana blue-ribbon streams.
Prime spots cluster in the upper Ruby's main stem and tributaries within Beaverhead-Deerlodge National Forest, where grayling mix with rainbows and cutthroats in freestone runs. Fly anglers target dries like Adams or Stimulators during caddis hatches, nymphs in riffles, and hoppers along arid banks from late June to frost. Below the dam, shift to browns, but grayling demand stays upstream for pure pursuit.
Fish June through September for stable flows and insect activity, with summer hopper fishing peaking in windy, grassy valleys. Expect narrow, brushy channels requiring in-river wading and short casts; flows under 400 cfs ease navigation within high-water marks. Prepare for remote access via gravel roads, variable weather, and mandatory catch-and-release in restoration zones.
Local ranchers and FWP biologists drive grayling revival through stocking since 1997 and habitat protection, fostering a collaborative angling ethos. Twin Bridges outfitters share insider beats, while Alder cafes buzz with tales of trophy sails. Anglers bond over this under-the-radar gem, respecting fences and leaving no trace.
Book guides through local outfitters like those in Twin Bridges for upper Ruby access, as private ranches limit roads; aim for weekdays to dodge rare crowds. Time trips for July-August hopper season, when grayling key on terrestrials, and check Montana FWP flows under 400 cfs for wadeability. Secure USFS maps and FWP fishing licenses online in advance, as cell service fades in remote stretches.
Pack polarized glasses to spot grayling in gin-clear water and wear felt-soled boots for slick cobbles in brushy confines. Bring a 3-4 wt rod for delicate presentations and extra tippet for frequent leaders. Study FWP grayling reports for current stocking success, and practice catch-and-release with barbless hooks to aid restoration.