The Bitterroot is in good early-fall shape after another shot of cooler, wetter weather over the weekend. The lower river near Missoula is around 1,200 cfs, which is up from the last report’s 1,020 cfs reading. That extra water is a welcome change and should help fish feel more comfortable along banks, seams, and riffle edges. The river is still clear enough that presentation matters, but it is not nearly as skinny or demanding as it was during the late-August low-water stretch.

Saturday’s rain and cooler air helped the Bitterroot by freshening flows and keeping water temperatures in a better range. The next few days look warmer and pleasant around Hamilton, with highs mostly in the 70s before a cooler push arrives Friday and Saturday. That late-week cool-down should help the bite, especially if clouds or showers return.

Focus on riffle edges, soft inside seams, tailouts, foam lines, shaded banks, undercut edges, side channels, and deeper green lanes. Dry-dropper rigs are still a strong way to cover water, especially with a terrestrial on top and a small mayfly, caddis, or jig nymph underneath. In slower slicks, take your time and watch for heads before casting. If fish are rising, a single dry with a quiet drift is usually better than a heavy dropper rig.

The fall hatch transition is underway. There is still a good chance to find fish on terrestrials, especially beetles, ants, and hoppers along grassy banks, brushy edges, and cutbanks. At the same time, anglers should start watching closely for BWOs during cloudy or showery periods. October Caddis are already showing, and Mahogany Duns and Hecubas should become more important over the next few weeks.

Streamer fishing is becoming more worthwhile as we move toward fall. Cloud cover, wind chop, slightly stained water, or cooler temperatures can make trout more willing to chase. Work small sculpins, Thin Mints, Woolly Buggers, and modest articulated patterns along banks, shelves, and deeper seams.

What's Working

Dry Flies

• Hoppers #8-12
• Ants #12-18
• Beetles #12-16
• Chubby Chernobyls #8-14
• Water Walkers #8-12
• BWO Dries #18-22
• Elk Hair Caddis #14-18
• X-Caddis #14-18
• October Caddis Adults #8-12
• Mahogany Duns #14-16
• Hecubas #10-12
• Purple Haze #14-20
• Parachute Adams #14-20

Nymphs

• Frenchies #14-18
• Pheasant Tails #14-20
• Perdigons #14-20
• BWO Nymphs #18-22
• Caddis Pupa #12-18
• October Caddis Pupa #8-12
• Jigged Hare’s Ears #14-18
• Prince Nymphs #12-16
• Small jig nymphs #16-20

Streamers

• Sparkle Minnows
• Mini Dungeons
• Sculpzilla
• Thin Mint
• Woolly Buggers
• Small sculpin patterns
• Olive streamers
• Black streamers