Southwest Montana, Montana
Big Hole River Fishing Report: May 25, 2026
Big Hole River is good today with 1,430 cfs at 7:15 am, a stable flow trend, and a best window of late morning through afternoon, with clouds extending the window.
- Status
- good
- Flow trend
- stable
- Best window
- Late morning through afternoon, with clouds extending the window
- Best methods
- nymphs, dry flies
Quick Summary
Big Hole River is a good option today. USGS showed 1,430 cfs at 7:15 AM and 2.78 feet, with the flow trend stable and water temperature 55 F. The best plan is late morning through afternoon, with clouds extending the window; start with nymphs; dry flies and adjust for light, wind, and clarity at the access.
Conditions Snapshot
| Field | Value |
|---|---|
| Status | Good |
| Flow | 1,430 cfs at 7:15 AM |
| Gauge Height | 2.78 feet |
| Water Temp | 55 F |
| Clarity | Not reported |
| Trend | Stable |
| Best Window | Late morning through afternoon, with clouds extending the window |
| Best Method | nymphs; dry flies |
| Wadeability | Good |
Weather
For Melrose, MT, the National Weather Service forecast says: Memorial Day: A chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 79. South southeast wind 2 to 18 mph, with gusts as high as 25 mph. Chance of precipitation is 40%. Active NWS alerts for the point check: No active NWS alerts for the checked point.
River Notes
Use the Melrose gauge as the baseline, then confirm clarity and bank safety when you arrive. A stable hydrograph means fish may shift through the day; if the river bumps up, favor inside bends, softer banks, and defined seams instead of committing to heavy mid-channel water. Official gauge data does not report clarity, so treat clarity as Not reported until it is checked on site.
Hatch Activity
Current hatch guidance is based on late-May regional timing, current official gauge/weather checks, and public local report pages reviewed separately for context.
| Hatch | Size | Notes |
|---|---|---|
| Blue Winged Olive | 16-20 | Cloud cover can extend activity |
| March Brown | 12-14 | Late spring mayflies in softer seams |
| Caddis | 14-18 | Search banks and riffle edges |
| Salmonfly / Stonefly Nymphs | 4-8 | Large nymphs matter as runoff builds |
Recommended Flies
| Category | Fly | Size | Notes |
|---|---|---|---|
| Dry | BWO Sparkle Dun | 16-20 | Use in cloudy windows |
| Dry | Elk Hair Caddis | 14-18 | Search edges |
| Nymph | Pat’s Rubber Legs | 4-8 | Good lead fly in pushy water |
| Nymph | Pheasant Tail | 14-18 | Trail behind a stonefly |
| Streamer | Sculpin | 4-6 | Fish banks if color is present |
Tactics
Start subsurface in the most defined walking-speed lanes and change depth before changing flies. If fish begin rising, simplify to one accurate dry or a dry with a small emerger and lengthen the leader. For good wading, keep crossings conservative and check the gauge again before stepping into pushy water.
Gauge Links
| Gauge | Flow | Temp | Link |
|---|---|---|---|
| Big Hole River near Melrose MT | 1,430 cfs | 55 F | USGS 06025500 |
Sources
Official sources checked: USGS station 06025500 and the National Weather Service forecast for the Melrose, 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.