The most storied trout stream in America. Legendary Catskills fishery famous for its selective brown trout, prolific Hendrickson hatches, and hallowed Junction Pool where the Willowemoc meets the Beaverkill.
Live USGS water data — updated every 30 minutes
Conditions-adjusted recommendations for right now
Complete hatch calendar with peak windows and matching fly patterns
10 documented hatches with peak timing and matching fly patterns
| Insect | Season | Peak | Time | Patterns |
|---|---|---|---|---|
| Blue Wing Olive (Baetis) | Mar 25 - Jun 1 | Apr 10 - May 15 | Afternoon, best on overcast days | dry Parachute BWO #18/20dry Comparadun BWO #18/20nymph WD-40 #20/22 |
| Quill Gordon | Apr 12 - May 8 | Apr 20 - May 1 | Early afternoon | dry Quill Gordon Dry #12/14nymph Quill Gordon Nymph #12/14 |
| Hendrickson | Apr 20 - May 25 | Apr 28 - May 15 | Afternoon, 1-4pm | dry Hendrickson Dry #12/14emerger Hendrickson Emerger #14dry Red Quill Spinner #14nymph Hendrickson Nymph #12/14 |
| Caddis (Grannom) | Apr 25 - Jun 20 | May 10 - Jun 5 | Evening | dry Elk Hair Caddis #14/16emerger Caddis Emerger #14/16nymph Green Caddis Larva #14/16 |
| March Brown | May 12 - Jun 12 | May 22 - Jun 7 | Afternoon to evening | dry March Brown Comparadun #10/12nymph March Brown Nymph #10/12 |
| Sulfur | May 28 - Jul 15 | Jun 8 - Jul 1 | Evening dusk | dry Sulfur Comparadun #16/18emerger Sulfur Emerger #16/18dry Pale Evening Dun #16nymph Sulfur Nymph #16/18 |
| Green Drake | May 28 - Jun 18 | Jun 3 - Jun 13 | Late afternoon to dusk — the most famous hatch in America | dry Green Drake Dry #8/10dry Coffin Fly Spinner #8/10emerger Green Drake Emerger #10 |
| Light Cahill | May 25 - Jul 20 | Jun 10 - Jul 5 | Evening | dry Light Cahill Dry #12/14nymph Light Cahill Nymph #12/14 |
| Isonychia (Slate Drake) | Jun 1 - Oct 15 | Jun 20 - Aug 20 | Evening | dry Isonychia Comparadun #10/12nymph Isonychia Nymph #10/12 |
| Blue Wing Olive (Fall) | Sep 20 - Nov 15 | Oct 5 - Nov 1 | Afternoon | dry Parachute BWO #18/20/22emerger RS2 Emerger #20/22 |
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