The Bitterroot received some much-needed water from Friday's rain, bringing a welcome change to the lower and middle stretches. The lower river near Missoula was recently running around 960 cfs, up from approximately 832 cfs in the previous report. The increased flows have given trout more holding water along banks, riffles, and deeper seams, making the river a little more forgiving than it was during the low-water conditions earlier in October.

The rain that moved through western Montana on Friday helped refresh the system, while the colder temperatures have continued pushing the river into a true late-fall pattern. The additional water may introduce some color in certain stretches, so anglers should pay attention to visibility before choosing their approach.

Monday looks relatively comfortable, with temperatures climbing into the low 50s. Rain returns Monday night and Tuesday, with another cold system bringing possible rain and snow later in the week. This cooler, unsettled weather should improve BWO fishing and create favorable opportunities for anglers throwing streamers.

Focus on riffle transitions, deeper green runs, foam lines, soft inside seams, undercut banks, and newly accessible holding water along the edges. Nymphing will likely be the most dependable approach before the afternoon hatch activity develops.

Fall Hatches

BWOs are the primary hatch to watch on the Bitterroot. Cloudy, damp weather should provide excellent conditions for these small mayflies, particularly during the early afternoon. Watch slower seams and tailouts for fish rising consistently.

Mahogany Duns are still worth carrying, although their activity is becoming less reliable as October progresses. Hecubas are another fall pattern worth having available, but they are no longer a hatch to count on every day.

Anglers are still seeing October Caddis, although the hatch is gradually fading. Larger orange-bodied dries and October Caddis pupa can still produce fish in broken water.

Terrestrials are becoming a secondary option. Beetles, ants, and occasional small hoppers may still pick up fish during warmer afternoon periods, but smaller mayflies and nymphs should receive most of the attention.

Streamer fishing is becoming especially appealing with the added water. The combination of higher flows, cloud cover, and cooler temperatures may encourage larger trout to chase. Work Sparkle Minnows, Thin Mints, and small articulated streamers through deeper banks, shelves, and structure.

Outlook for the Week

Rain and cooler temperatures should keep the river fishing well for anglers prepared for changing weather. The best window remains late morning through afternoon, with BWOs and streamers offering the most promising opportunities.

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

• Parachute Adams #16–20

• Purple Haze #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