New York ·
Beaverkill River Fly Fishing Report - September 20, 2026

BEAVERKILL RIVER
ReportSEP 20 — 27, 2026
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Flow
210CFS
BEAVER KILL AT COOKS FALLS NY
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Water Temp
61.7°F
Updated 2026-09-20
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Weather
47–65°F
Rain Showers
💧
Clarity
Clear
Check post-storm
Flow is 210 CFS at Cooks Falls with a gauge height of 1.7 ft — low, clear, and very wadeable heading into today's all-day rain event; water temperature is a comfortable 61.7°F, right in the sweet spot for active fall trout.
What's Working — Hot Flies

Parachute - Blue Wing Olive #22
#22

Juju Baetis Tungsten #22
#22
Barr's Flashback Emerger - BWO #22
#22

Top Secret Baetis #16
#16

Pheasant Tail Tungsten #20
#20

Olsen's Pheasant Tail Nymph Doppleganger Brown Barbless #24 - 20
#20

Roza's World Spain Perdigon Barbless #18 - 32
#18

Black Zebra Midge(TBH) #20
#20

Bionic Ant 2.0 - Black #16
#16

Corn-fed Caddis (CDC) Olive #20
#20

Egan's Silver Bullet - Baetis #14
#14
BWO WD-40 #22
#22
Hatch Chart
| Insect | Size | Activity | Prime Time |
|---|---|---|---|
| Blue-Winged Olive (Baetis) | #18-22 | Heavy | 10 AM - 3 PM |
| Midge | #20-24 | Moderate | 8 AM - 11 AM |
| Caddis | #16-20 | Light | 4 PM - 6 PM |
| Terrestrials (Ants) | #16 | Light | 11 AM - 2 PM |
| Pheasant Tail / Baetis Nymph | #18-22 | Moderate | 9 AM - 1 PM |
Best Time Window
- 8 AM - 10 AM: Midge activity in slow pools before the BWO hatch kicks in — tight-line nymphing in deeper runs.
- 10 AM - 2 PM: Peak BWO hatch window under full cloud cover — prime dry fly opportunity on flats and tailouts.
- 4 PM - 6 PM: Late caddis activity in riffles and evening nymphing before rising flows push fish to cover.
Guide's Tip
From the benchAll-day rain and overcast skies are your best friend for BWO hatches on the Beaverkill — expect fish to be looking up from mid-morning through early afternoon. At 210 CFS the river is low and clear, so approach your pools from downstream, stay low, and make long, drag-free drifts. Focus your nymphing in the 2-4 foot depth range along current seams using a tight-line or short-indicator setup, and be ready to switch to a dry the moment you see noses. Keep an eye on the gauge — with 0.5-0.75 inches of rain forecast today, flows will likely rise by evening, so fish the upper beats early and move to more sheltered pools as the afternoon progresses.
Main Species
Brown Trout
Rainbow Trout
Brook Trout
