Madison River
Lower Madison · Bear Trap Canyon to Three Forks
SW Montana, USA
Open live forecast →Target species: Brown and Rainbow.
Stream gauge: 06041000. Flow and water temperature update on every refresh.
Weekly AI Outlook as of 06/05/26
Lower Madison is flowing 1380 cfs with 62.6°F water — excellent conditions as runoff impacts hit other rivers. PMDs are driving afternoon action per Fins & Feathers reports, with salmonflies beginning their show through Bear Trap Canyon. Wind forecast looks brutal (21-30 mph all week) but the protected canyon sections will fish. Focus subsurface with PMD nymphs and golden stone patterns, watching for emerging bugs during calmer afternoon windows.
- Flow: 1380 cfs — perfect level with lake-regulated clarity while other rivers muddy up from runoff
- Hatches: PMDs consistent afternoons, salmonflies starting to show on rocks, golden stones active through canyon
- Water Temp: 62.6°F — ideal for all June hatches, salmonfly emergence threshold crossed
- Best Window: Afternoons in protected canyon water when 20+ mph winds calm slightly for surface activity
Generated weekly from live USGS gauge readings, weather forecasts, and recent fly shop reports. Updates Friday mornings.
About this Water
- Freestone
- Best months: Apr–Oct; peak late Apr–May (Mother's Day Caddis) & Oct (streamers)
The Lower Madison flows from Ennis Lake Dam through the spectacular Bear Trap Canyon — a federally designated Wild and Scenic reach — before spreading into braided flats approaching Three Forks and its confluence with the Missouri. The Bear Trap is hike-in or raft-only, offering some of the most secluded fishing in the state. The Mother's Day Caddis hatch in late April through May is one of the signature dry fly events in Montana, and October streamer fishing draws anglers from across the country.
Bear Trap Canyon is the only federally designated Wild and Scenic section of the entire Madison River — a roadless gorge accessible only on foot or by whitewater raft.
January Outlook
January below Ennis Lake Dam is productive for dedicated anglers. Dam-regulated flows keep the river fishable and the dense midge populations sustain consistent feeding.
Productive Patterns
- Zebra Midge
- RS2
- Pheasant Tail
- WD-40
Tips
Focus on the deeper pools in the lower canyon. Fish are stacked in winter lies and are catchable with slow-drifted midge rigs. Bear Trap Canyon is closed to vehicles in winter — hike or ski in.
Water Notes
600–1,000 cfs. Lake-regulated. Cold but rarely freezing at the surface. Bank ice present.
February Outlook
First BWO activity appears on warm afternoons. The lower Madison's lake-regulated flows make February consistently fishable when most other Montana rivers are locked under ice.
Productive Patterns
- Zebra Midge
- Vis-A-Dun #20
- RS2
- Hare's Ear
Tips
Lake regulation is the key advantage here in early season. Fish the soft-water edges in the Bear Trap stretch. 11am–2pm is prime on warm days.
Water Notes
600–1,000 cfs. Stable flow from Ennis Lake Dam. Water 36–44°F.
March Outlook
Consistent BWO hatches and first Skwala stoneflies. The canyon sections hold big browns that are increasingly active after a cold winter.
Productive Patterns
- Sparkle Dun #18
- Skwala Stone
- RS2
- Elk Hair Caddis
Tips
The hike into Bear Trap Canyon rewards early-season anglers with relatively little pressure. Skwala nymphs work all day before the dries appear in the afternoon.
Water Notes
700–1,500 cfs. Pre-runoff stability. Water 42–50°F.
April Outlook
The lake-buffered flows keep the lower Madison fishable through April's runoff when other rivers blow out. The Mother's Day Caddis hatch begins in late April — early emergences build through the month.
Productive Patterns
- Skwala Stone
- Elk Hair Caddis #16
- X-Caddis
- Streamer
Tips
The lower Madison is often the only option in April when runoff hits. Watch for the first caddis emergences in the canyon sections late in the month. A drift boat is valuable through the lower reaches.
Water Notes
1,000–2,000 cfs. Lake provides significant runoff buffering. Far clearer than free-flowing rivers.
May Outlook
The Mother's Day Caddis hatch is the defining event — massive Brachycentrus emergences blanket the river and trigger aggressive surface feeding from dam to Three Forks. PMDs add to the action later in the month.
Productive Patterns
- Elk Hair Caddis #14
- X-Caddis
- PMD Cripple
- Copper John
Tips
Float from Warm Springs down to Three Forks during the Mother's Day Caddis. Evening hatches are thick and fish rise confidently. The Three Forks area is a prime evening destination.
Water Notes
1,500–3,000 cfs. Flows higher but stable from the lake. Water 52–60°F.
June Outlook
Salmonfly hatch moves through the canyon. PMDs and Golden Stoneflies provide consistent day-long action. One of the premier June fisheries in Montana.
Productive Patterns
- Salmonfly
- PMD
- Golden Stone Stimulator
- Elk Hair Caddis
Tips
The lower canyon salmonfly hatch is dramatic — large stones on every bankside rock. Fish aren't always eating the big dries but nymph or streamer while watching for it.
Water Notes
2,000–4,500 cfs. Flows elevated with some runoff. Clarity good due to lake regulation.
July Outlook
Classic hopper country through the braided flats. Evening caddis hatches below Ennis Lake are legendary — among the most prolific in Montana.
Productive Patterns
- Chubby Chernobyl
- Dave's Hopper
- PMD Cripple
- Evening Caddis
Tips
The Bear Trap Canyon in July is outstanding. Hopper season underway. Evening caddis below the lake from 6pm onward is among the best dry fly fishing in Montana.
Water Notes
1,500–3,000 cfs. Water 62–68°F. Warm but manageable.
August Outlook
Hopper season in full swing. The braided flats and canyon sections both fish well. Evening caddis continues to be exceptional.
Productive Patterns
- Dave's Hopper
- Parachute Ant
- Elk Hair Caddis
- Trico Spinner
Tips
Early morning Trico spinner falls at Three Forks. Midday hopper in the canyon. Evening caddis through the braided flats. Three-session August days are a specialty.
Water Notes
1,000–2,000 cfs. Water 66–70°F midday. Fish early and late.
September Outlook
Outstanding fall fishing. BWO hatches returning, streamer season building. September on the lower Madison is exceptional and crowds are dramatically reduced.
Productive Patterns
- Blue Winged Olive
- Streamer
- Hopper
- Trico Spinner
Tips
Post-Labor Day crowds disappear entirely. September's cooling temperatures bring larger fish into active feeding. Streamer fishing in the canyon improves daily through the month.
Water Notes
900–1,500 cfs. Water 54–62°F. Prime fall conditions.
October Outlook
Prime streamer month. Large brown trout preparing to spawn are aggressive to streamers and attractor patterns. Fall BWO hatches on overcast days.
Productive Patterns
- Articulated Streamer
- Woolly Bugger
- Blue Winged Olive
- Mahogany Dun
Tips
The large browns staging for the spawn are the most catchable large fish of the year. Swing streamers through the deep canyon pools. Respect fish on redds.
Water Notes
800–1,200 cfs. Clear and cold. Water 44–54°F. Prime fall conditions.
November Outlook
Winter transition. Midging in the canyon for committed anglers. Brown trout spawn — give spawning fish space.
Productive Patterns
- Zebra Midge
- RS2
- Pheasant Tail
- WD-40
Tips
Fish away from visible redds. The canyon midge fishing is productive 11am–2pm on mild days.
Water Notes
700–1,000 cfs. Cooling fast. Water 38–46°F.
December Outlook
Quiet month. Bear Trap Canyon is difficult access in deep snow. Dedicated midge fishers find action on mild days near Three Forks.
Productive Patterns
- Zebra Midge
- Juju Baetis
- RS2
- Mercury Midge
Tips
The Three Forks area near the Missouri confluence is the most accessible winter fishing. Focus noon–3pm.
Water Notes
600–900 cfs. Ice and snow. Water 34–40°F.
Hatch Calendar
| Insect | Peak | Active | Size | Productive Patterns |
|---|---|---|---|---|
| Blue Winged Olive Baetis spp. |
Apr, Oct | Mar, Apr, May, Sep, Oct, Nov | #18–22 |
|
| Caddis (Mother's Day Grannom) Brachycentrus spp. |
May | Apr, May | #14–16 |
|
| Salmonfly Pteronarcys californica |
Jun | Jun | #4–6 |
|
| Golden Stonefly Hesperoperla pacifica |
Jul | Jun, Jul | #6–10 |
|
| Yellow Sally Isoperla / Chloroperla spp. |
Jul | Jul, Aug | #14–16 |
|
| Pale Morning Dun Ephemerella inermis |
Jul | Jun, Jul, Aug | #16–18 |
|
| Caddis Hydropsyche spp. |
Jul, Aug | Jun, Jul, Aug, Sep | #14–18 |
|
| Trico Tricorythodes spp. |
Aug | Jul, Aug, Sep | #20–24 |
|
Access & Approach
Bear Trap Canyon requires a 3-mile hike from the trailhead (BLM land, no fee). Below the canyon, Warm Springs and Cobblestone accesses provide wade and float options. The braided lower stretch is floatable but shallow in late summer.
Nearby Fly Shops
- Madison River Fishing Company
- The Stonefly Inn & Fly Shop
- Fins & Feathers of Bozeman
- Yellow Dog Flyfishing
- Rivers Edge
- Bozeman Fly Supply
Regulations & License
Fishing in Montana requires a current license. Always verify season dates, bag limits, and any special-regulation waters before you fish.
Montana fishing regulations & license →
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About Current
Madison River conditions on Current combine real-time flow data (USGS, WSC, CDEC, CEHQ), weather, tide predictions, hatch probabilities calibrated to this specific water, and recent fly shop reports from the area.
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