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Flathead River Fishing Report | July 14, 2025

Report by Ryan Stultz
Ryan Stultz is the outfitter and head guide for Bent Fly Fishing in Montana.
What is working right now

The Flathead River is fishing strong for westslope cutthroat in mid-July 2025, with above-average dry fly action helped by a recent cool-down and rain. Anchor the drift boat and cast a size 16 Rusty Spinner PMD at the heads of riffles. Purple Haze and Parachute Adams also produced the best fish. Strategic summer rain is keeping this fishery prime.

What is biting on the Flathead River right now?

Westslope cutthroat trout are on a strong dry fly bite. Ryan Stultz reports the dry fly fishing was above average, with most fish coming on mayfly patterns. A recent cool-down and rain dropped temps and kept the river in prime shape. Some bigger fish came from riffle heads.

What flies are working on the Flathead River?

Mayfly stuff is the ticket: Purple Haze and Parachute Adams for most fish, and a size 16 Rusty Spinner PMD for the best fish from riffle heads. These are fly patterns rather than products we carry, so match the mayfly hatch from your own box or a local fly shop.

How should I fish the Flathead River now?

Anchor the drift boat and cast multiple times into the head of the riffles with a size 16 Rusty Spinner PMD. That approach produced the best fish for Ryan. Focus on mayfly patterns during the above-average dry fly windows and keep the fish wet on release.

What are the water conditions on the Flathead River?

A recent cool-down and rain improved conditions, with river temps favorable despite fluctuating summer heat. It dipped under 50 degrees one day, then back into the 70s and high 80s. The river runs a little low but the strategic rain keeps it cool. Exact flows were not specified in this report.

What is the outlook for the Flathead River?

Prime, with more rain in the forecast to keep water cool. Ryan says northwest Montana is all about strategic rain right now. The Clark Fork is also still fishing great with scrappy trout, best early when water is coldest. Longer-term outlook was not specified in this report.

Watch the full report

From the report (Ryan Stultz): The mighty main stem of the Flathead is actually still fishing good. The dry fly fishing today was above average. Most of the fish today came on Mayfly stuff: Purple Haze, Parachute Adams. Caught some bigger fish anchoring up in the drift boat, casting into the head of these riffles with a size 16 Rusty Spinner PMD.

Flathead River July 14, 2025 FAQ

Is the Flathead River fishing well in mid-July?

Yes. Dry fly fishing is above average for westslope cutthroat, helped by a recent cool-down and rain.

What flies work on the Flathead River now?

Purple Haze, Parachute Adams, and a size 16 Rusty Spinner PMD at the heads of riffles.

How do I fish the riffles on the Flathead?

Anchor the drift boat and make multiple casts into the head of the riffles with a size 16 Rusty Spinner PMD.

What species are in the Flathead River?

Native westslope cutthroat trout, unique to northwest Montana, are the main catch.

How is the weather affecting the Flathead River?

Strategic rain and cool-downs are keeping the water cool and the dry fly fishing prime.

Is the Clark Fork River also fishing well?

Yes. It is still fishing great with scrappy trout, best early in the morning when the water is coldest.

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