Catskills, New York
Beaverkill and Willowemoc Fishing Report: May 18, 2026
Beaverkill and Willowemoc is in a useful fishing window today.
- Status
- good
- Flow trend
- falling
- Best window
- Late afternoon into evening
- Best methods
- dry flies, nymphs, streamers
Quick Summary
Beaverkill and Willowemoc is in a useful fishing window today. USGS showed 606 cfs and 2.91 feet at 7:30 AM, with the flow trend falling. Water temperature was 58 F. Start with dry flies, then watch for late-day mayfly, caddis, or midge activity where the water settles. With hot air temperatures forecast, carry a thermometer and stop targeting trout if afternoon water approaches 68 F.
Conditions Snapshot
| Field | Value |
|---|---|
| Status | Good |
| Flow | 606 cfs at 7:30 AM |
| Gauge Height | 2.91 feet |
| Water Temp | 58 F |
| Clarity | Not reported |
| Trend | Falling |
| Best Window | Late afternoon into evening |
| Best Method | dry flies; nymphs; streamers |
| Wadeability | Limited |
Weather
For Roscoe, NY, the National Weather Service forecast says: Today: Mostly sunny, with a high near 87. South wind 2 to 9 mph. 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 falling trend is worth watching through the day; if the hydrograph turns sharply upward, clarity and wade safety can change before hatch timing does. Missing field values are left as Not reported rather than filled from guesswork.
Hatch Activity
Current hatch guidance is based on seasonal May patterns for this river system, recent public report context where available, and today’s official gauge/weather check.
| Hatch | Size | Notes |
|---|---|---|
| Sulphur | 14-16 | Possible in softer water late day |
| Blue Winged Olive | 18-22 | Best in cloudier periods |
| Caddis | 14-18 | Pupa and adults remain useful |
| March Brown | 10-12 | Carry for sporadic larger mayflies |
Recommended Flies
| Category | Fly | Size | Notes |
|---|---|---|---|
| Dry | Sulphur Comparadun | 14-16 | Use over steady risers |
| Dry | BWO Sparkle Dun | 18-22 | Match small olives in softer seams |
| Nymph | Pheasant Tail | 14-18 | Mayfly nymph before hatches |
| Nymph | Caddis Pupa | 14-18 | Swing or dead drift before activity |
| Streamer | Olive Sculpin | 4-8 | Use on banks if water has color or light is low |
Tactics
Start with dry flies in defined lanes and adjust weight 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 |
|---|---|---|---|
| BEAVER KILL AT COOKS FALLS NY | 606 cfs | 58 F | USGS 01420500 |
Sources
Official sources checked: USGS station 01420500 and the National Weather Service forecast for the Roscoe, NY 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.