Updated October 15, 2026
    Access point

    Valley of the Moonon Rock Creek

    Offers access to diverse water, from deep pools to faster runs.
    Rock Creek reportDirections46.7725°N, 113.2750°W
    Bite report · week of Oct 4

    Robust October Caddis hatches are a primary food source

    1. 01Robust October Caddis hatches are a primary food source, with active adult caddis on the water.
    2. 02Blue-Winged Olive (BWO) emergences are becoming more prevalent, providing selective dry fly opportunities.
    3. 03Terrestrial patterns, especially hoppers and ants, remain effective on warmer fall afternoons, particularly along shaded banks.
    4. 04Subsurface nymphing with Hare's Ear and Midge patterns is productive for trout feeding on active nymphs and pupae.
    5. 05Larger trout are responding to stripped Olive Woolly Buggers, mimicking baitfish and leeches in cooler waters.

    What to tie on at Valley of the Moon

    Picked from recent reports for this stretch.

    dry95%

    Chubby Chernobyl

    #14#16

    Dry-dropper fishing is consistent on Rock Creek, with anglers successfully using this large attractor dry, as well as finding aggressive Westslope Cutthroat taking large foam dries regionally.

    nymph95%

    Tungsten Bead Pat's Rubber Legs

    #4#6#8#10

    Explicitly mentioned in recent angler reports as effective for heavier nymph rigs in high flows.

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    terrestrial95%

    Keller's Heneberry Hopper-Tan

    #6#8#10

    Terrestrial activity, particularly hoppers, is consistently effective on Rock Creek, with this pattern being a top dry fly choice. Regional reports also confirm strong hopper activity.

    nymph95%

    Double Bead Stone

    #4#6#8

    Explicitly mentioned in recent angler reports as effective for heavier nymph rigs in high flows.

    streamer90%

    Woolly Bugger (Black/Olive)

    #4#6#8

    With current water color, streamers are effective for moving aggressive fish, imitating leeches and baitfish in colder spring water.

    dry90%

    X-Caddis

    #14#16#18

    Explicitly mentioned in recent angler reports as a good option when coming upon rising fish, matching the current caddis activity.

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    dry90%

    Water Walker

    Explicitly mentioned in recent angler reports as a productive dry fly for Rock Creek, similar to other large foam dries effective regionally for aggressive Westslope Cutthroat.

    dry90%

    Pat's Rubber Leg Stonefly

    A nocturnal stonefly imitation is proving effective early on Rock Creek, and this large, weighted nymph is a consistent subsurface dropper for trout keyed into stoneflies.

    nymph90%

    Flashback Hare's Ear Nymph

    #14#16#18

    Recommended as an effective subsurface dropper on Rock Creek, mimicking various active aquatic insects. This is a consistent all-around nymph for trout.

    Montana season by season

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

    Fly shops nearby

    Local flies, current advice and guided trips.

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