Updated October 15, 2026
    Access point

    Barretts Diversion Damon Beaverhead River

    A lower river point known for trophy brown trout habitat and deeper pools.
    Beaverhead River reportDirections45.1581°N, 112.6567°W

    River flow last 30 days

    050100Sep 16Sep 22Sep 2765 cfs
    Flow now
    108cfs
    Above the typical range (82–93 cfs)
    Last 7 days
    Rising
    65 to 95 cfs
    Bite report · week of Oct 4

    What's working on Beaverhead River

    1. 01Terrestrial patterns like Hoppers and Ants remain effective, especially in early fall.
    2. 02October Caddis are becoming a significant factor, with adults emerging.
    3. 03Blue-Winged Olive (BWO) and Mahogany Dun hatches are starting to appear, offering dry fly opportunities.
    4. 04Larger fall attractors are enticing aggressive strikes.

    What to tie on at Barretts Diversion Dam

    Picked from recent reports for this stretch.

    dry95%

    Chubby Chernobyl

    #14#16

    A highly effective large foam dry and attractor pattern, explicitly recommended in recent regional reports for aggressive trout looking up.

    dry95%

    October Caddis

    Explicitly mentioned in recent regional intelligence signals (Middle Fork & North Fork Flathead) as becoming a significant factor and a key fall hatch.

    emerger90%

    Pale Morning Dun Sparkle Dun

    #16#18

    PMD hatches are prevalent during summer, and this emerger/dry pattern is excellent for selective trout feeding in the film.

    dry90%

    Stimulator (Yellow)

    #14#16

    A versatile attractor dry fly that imitates both golden stoneflies and larger terrestrials, triggering aggressive strikes in faster water.

    dry90%

    Blue-Winged Olive Comparadun

    #18#20#22

    Blue-Winged Olives are consistently mentioned in recent regional intelligence signals (North Fork Flathead) as appearing in fall, and this pattern is excellent for selective trout.

    dry90%

    Yellow Sally

    #14#16#18

    Little Yellow Sallies are actively hatching, and fish are keying in on these small stonefly patterns.

    Buy at Amazon
    dry90%

    Girdle Bug

    An effective large attractor pattern, as indicated by recent regional reports for aggressive trout, and can be used as a large dry or in a dry-dropper rig.

    terrestrial90%

    Schroeder's Hi-Vis Hopper

    #6#8#10

    Terrestrial activity is at its peak in summer, making hopper patterns crucial for trout feeding on the surface.

    dry85%

    Mahogany Dun

    #14#16#18

    Mahogany Duns are mentioned in recent regional intelligence signals (North Fork Flathead) as beginning to appear in fall, providing dry fly opportunities.

    Buy at Amazon

    Montana season by season

    What changes on the water through the year, with the flies for each season.

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