The Bitterroot is in good mid-October shape, with the lower river near Missoula running around 832 cfs. That is a slight decrease from Friday's reading near 849 cfs, but flows remain relatively stable after the small increases earlier last week. The middle and lower river offer the most comfortable fishing conditions, while the upper stretches remain shallow, clear, and increasingly technical.

The weekend brought generally dry conditions and some breezy weather to western Montana. Combined with cold overnight temperatures, this has kept the water clear and cool. The biggest factor affecting fishing now is water temperature rather than flow. Expect the morning bite to start slowly, with fish becoming more active as the water warms during the late morning and afternoon.

Look for trout along riffle transitions, foam lines, deeper green runs, inside seams, and soft shelves adjacent to faster water. The clearer conditions mean anglers should approach carefully, use longer leaders, and avoid disturbing productive holding water.

Fall Hatches

Fall hatches are becoming the main attraction on the Bitterroot. BWOs are increasingly important, particularly during cloudy afternoons. Mahogany Duns are also worth carrying, especially in sizes 14–16, and Hecubas remain a possibility in the appropriate water.

Anglers are already seeing October Caddis, and larger orange-bodied dry flies can still attract fish along broken banks and riffles. Small midges are becoming increasingly relevant in slower pools and tailouts.

There is still a chance to find fish on terrestrials, particularly beetles and ants during the warmer afternoons. Hoppers are becoming less dependable, but an occasional trout may still respond to a smaller hopper imitation along grassy banks.

Nymphing should remain the most consistent approach during the colder morning hours. Fish Frenchies, Perdigons, Pheasant Tails, and BWO nymphs through deeper seams. Once surface activity begins, switch to a single dry and concentrate on accurate presentations.

Streamer fishing is becoming an increasingly attractive option as we move deeper into fall. Cooler water and changes in light can make larger trout more willing to chase. Try olive or black sculpins, Sparkle Minnows, and smaller articulated streamers around undercut banks, woody structure, and deeper holding water.

Outlook for the Week

Monday through Wednesday should bring mild afternoons and generally pleasant conditions, with the best fishing developing around midday. Thursday and Friday introduce cooler temperatures and rain, potentially creating excellent conditions for BWOs and streamers.

What's Working

Dry Flies

• BWO Parachutes #18–22

• BWO Comparaduns #18–22

• Mahogany Duns #14–16

• Hecubas #10–12

• October Caddis Adults #8–12

• Purple Haze #16–20

• Parachute Adams #16–20

• Griffith's Gnats #18–22

• Beetles #12–16

• Ants #14–18

Nymphs

• Frenchies #14–18

• Perdigons #16–20

• Pheasant Tails #16–20

• BWO Nymphs #18–22

• October Caddis Pupa #8–12

• Duracells #14–18

• Zebra Midges #18–22

• Jigged Hare's Ears #14–18

Streamers

• Sparkle Minnows

• Thin Mints

• Mini Dungeons

• Sculpzilla

• Woolly Buggers

• Olive and Black Sculpins