Greater Yellowstone, Montana
Madison River Fishing Report: May 20, 2026
Madison River is fair today with 676 cfs at the primary gauge and morning, then watch storms and showers as the best window.
- Status
- fair
- Flow trend
- stable
- Best window
- Morning, then watch storms and showers
- Best methods
- nymphs, streamers, dry flies
Quick Summary
Madison River is fishable with mixed conditions today. USGS showed 676 cfs and 1.55 feet at 7:30 AM, with the flow trend stable. Water temperature was 43 F. Start with nymphs, then adjust to streamers or dry flies if fish show you a better lane or feeding level. Leave the water if thunder develops; open riffles and drift boats are poor places to wait out lightning.
Conditions Snapshot
| Field | Value |
|---|---|
| Status | Fair |
| Flow | 676 cfs at 7:30 AM |
| Gauge Height | 1.55 feet |
| Water Temp | 43 F |
| Clarity | Not reported |
| Trend | Stable |
| Best Window | Morning, then watch storms and showers |
| Best Method | nymphs; streamers; dry flies |
| Wadeability | Good |
Weather
For Ennis, MT, the National Weather Service forecast says: Today: A slight chance of rain between 9am and noon, then a chance of showers and thunderstorms. Partly sunny, with a high near 62. Southwest wind 3 to 12 mph. Chance of precipitation is 30%. No active NWS alerts were returned for the point check. Plan around wind, changing light, and any showers or storms rather than assuming a full-day dry fly window.
River Notes
The best starting point is water that matches the current gauge: inside seams, protected banks, riffle drop-offs, and slower buckets rather than the heaviest current. A stable trend is worth watching through the day; if the hydrograph turns sharply upward, clarity and wade safety can change before hatch timing does. Clarity was not available from an official gauge during this check, so treat it as Not reported and verify it at the access before committing to a long float or wade plan.
Hatch Activity
Current hatch guidance is based on seasonal May patterns for this river system, current public report context where available, and today’s official gauge/weather check.
| Hatch | Size | Notes |
|---|---|---|
| Blue Winged Olive | 18-22 | Clouds help surface activity |
| Caddis | 14-18 | Edges and riffles |
| March Brown | 10-12 | Carry for larger mayflies |
| Stonefly nymphs | 6-10 | Useful in faster slots |
Recommended Flies
| Category | Fly | Size | Notes |
|---|---|---|---|
| Nymph | Pat’s Rubber Legs | 6-10 | Stonefly anchor |
| Nymph | Pheasant Tail | 14-18 | Mayfly trailer |
| Dry | BWO Sparkle Dun | 18-22 | If fish rise |
| Dry | Elk Hair Caddis | 14-18 | Search softer seams |
| Streamer | Sculpin | 4-8 | Low light or stained edges |
Tactics
Start with nymphs in defined lanes and adjust weight, depth, or leader length before changing flies. If fish begin rising, simplify to a single dry or dry with an emerger/dropper and lengthen the leader. In bright or windy periods, return to subsurface presentations along protected banks and broken water. Re-check the gauge before wading new crossings, especially if the trend changes from stable or falling to rising.
Gauge Links
| Gauge | Flow | Temp | Link |
|---|---|---|---|
| MADISON RIVER NR CAMERON MT | 676 cfs | 43 F | USGS 06038800 |
Sources
Official sources checked: USGS station 06038800 and the National Weather Service forecast for the Ennis, MT area. This report is an original Custom FlyBox summary based on current official gauge and weather data, with local public conditions reports reviewed separately for hatch, access, and method context.