FISHABLE
Winter fishing open in Sections 1 & 2 (North Fork to Dickie Bridge). Flows around 1,800 CFS at Melrose—well within range. Spawning closures remain downstream of Dickie Bridge and upstream of North Fork. Milder-than-average winter temps across SW Montana.Big Hole River
Current Hatch Activity
Sparse midge activity on sunny afternoons when water temps creep above freezing. No dry fly opportunities—nymphing is the game. Fish are holding in slower, deeper runs and pools. Effective nymph patterns include #16 Spanish Bullets, #18 Zebra Midges, #16-18 Jig Frenchies, #6-12 Pat's Rubberlegs, and #12 San Juan Worms. Streamers (Sculpzilla, Mini Dali Lama, small sculpins) produce in low-light windows. Flows at Melrose around 1,800 CFS. Note: spawning closures in effect below Dickie Bridge and above North Fork—only Sections 1 & 2 are open.
FISHABLE
Nymph rig: #16 Purple or Black Spanish Bullet with #18 Zebra Midge dropper. Streamers (Sculpzilla, Mini Dali Lama, Dungeons) effective in deeper runs during low-light hours.
Quick Reference
200-1,000 CFS ideal for wade fishing. 1,000-3,000 CFS excellent for floating. Above 5,000 CFS during runoff is dangerous.
45-65°F optimal. Hoot owl restrictions (fishing closes 2pm-midnight) may apply when temps exceed 73°F.
Unregulated freestone with dramatic seasonal swings. Average flow around 1,000 CFS at Maiden Rock. Spring peak can hit 8,000 CFS. Late summer drops to 400 CFS.
Variable with weather and season. Excellent clarity outside of runoff. Thunderstorms can muddy the river temporarily.
What "Fishable" Means Here
Fishable when flows allow safe wading/floating and temps stay below 68°F. Home to the last native fluvial Arctic grayling in the lower 48. All grayling must be released. Drought management triggers voluntary closures at specific flow thresholds.
Seasonal Patterns
spring
March through May offers excellent pre-runoff fishing. Skwala stoneflies and March Browns bring fish up early. Runoff typically blows things out late May through mid-June.
summer
Post-runoff brings legendary dry fly fishing. Salmonflies, PMDs, and caddis produce well. Watch for hoot owl restrictions during heat waves—fish early morning.
fall
September through October is prime time. Brown trout get aggressive for spawn. Streamers produce trophy fish. BWOs and October caddis provide consistent dry fly action.
winter
Low flows (100-200 CFS) concentrate fish. Streamer and nymph fishing in deeper runs. Cold but productive for dedicated anglers willing to brave the elements.
Alerts
Alternative Waters
Beaverhead River
Tailwater alternative with more stable summer flowsMadison River
Dam-controlled option when Big Hole has heat restrictionsRiver Intel Weekly
Weekly flow updates and fishing intel.
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