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Rivers

Beaverkill River

The river that invented American dry-fly fishing, and still the best classroom for it.

Region
Catskill Mountains, New York, United States
Country
United States
Water type
Unregulated Catskill freestone, warm in midsummer
Species
brown, brook
Length
71 km
Typical flow
100–400 cfs; low and warm by mid-July, which shuts the fishing down
Season
May and June for dry flies; mid-September to November for streamers and olives
Best months
May · Jun · Sep · Oct
Published
2026-09-09

By The Fly Desk

Fly plate: Hendrickson Comparadun
Plate 1 · dressing
Aquatic insect plate: Blue Quill (Paraleptophlebia)
Plate 2 · insect

Hatch timeline

  • Apr · 13:00-16:00Blue Quill (Paraleptophlebia) Dun

    #16-18 · Apr · Hatch

  • May · 13:00-17:00Hendrickson (Ephemerella subvaria) Dun and spinner

    #12-14 · May · Hatch

  • May · 11:00-15:00March Brown (Stenonema vicarium) Dun

    #12 · May · Hatch

  • Jun · 20:00-22:30Green Drake (Ephemera guttulata) Dun at dusk

    #10-12 · Jun · Hatch

  • Jun · 17:00-21:00Isonychia bicolor Dun

    #10-12 · Jun · Hatch

  • Jun · 19:00-21:00Sulphur (Ephemerella invaria) Dun

    #14-16 · Jun · Hatch

  • Sep · 13:00-16:00Blue-Winged Olive (Baetis) Dun

    #18-20 · Sep · Hatch

  • Oct · 18:00-21:00October Caddis (Pycnopsyche) Adult

    #10-12 · Oct · Hatch

Matched fly box

PatternImitatesSizeTechnique
Hendrickson ComparadunEphemerella subvaria dun#12-14Cast upstream on a 4.5-metre leader; the first heavy rise of the year is usually on this fly.
Coffin FlyGreen drake nymph#10A Catskill original; fish it deep and slow before the drake hatch starts.
Catskill-style Light CahillStenonema dun#14The classic divided-wing dry; requires a slack-line cast and a long drift.
Iso NymphIsonychia nymph#10-12Swim it actively in the riffle at dusk; Isonychia nymphs are fast swimmers.
Black Nose DaceDace#6Streamer for autumn browns in the deeper bends below Cooks Falls.

The river

The Beaverkill rises in the Catskill highlands and joins the East Branch of the Delaware at Roscoe, and its place in fly-fishing history is out of all proportion to its size. Theodore Gordon fished here; the first American dry-fly patterns were tied for this water. Today it is a small, intimate, brown-trout river with steady hatches in late spring and a serious thermal problem in July and August, when water temperatures climb into the low twenties and the fish should be left alone.

On this river

Casting to Catskill trout

These fish are educated and the water is clear and low. Use a 4.5-metre leader with a 60 cm tippet, make the cast from a position where you never cross a fish with your line, and accept that you will sometimes need to wait twenty minutes for one fish to resume feeding.

The dusk drake

Ephemera guttulata hatches in the last half hour of light in the first two weeks of June. Position yourself before the hatch starts, fish a single #10 dry, and cover rising fish on the near bank first because the light will be gone before you can reach the far side.

Autumn streamers

From late September the browns turn aggressive and the fly can be bigger than anything you used in spring. Fish a #6 streamer across the current on a sinking tip, strip it in 20 cm pulls, and concentrate on log jams and undercut banks — the fish are defending lies rather than feeding.

Licence and rules

New York requires a fishing licence from 16; a one-day or seven-day nonresident licence is available. The Beaverkill is largely stocked put-and-take water with wild fish in the upper reaches, and there are special regulations on the no-kill stretches near Roscoe. Do not fish when the water temperature is above about 20°C — the catch-and-release mortality in warm water here is high enough to be a real problem.
When should I come?

The best months are May · Jun · Sep · Oct. May and June for dry flies; mid-September to November for streamers and olives

What licence do I need?

New York requires a fishing licence from 16; a one-day or seven-day nonresident licence is available. The Beaverkill is largely stocked put-and-take water with wild fish in the upper reaches, and there are special regulations on the no-kill stretches near Roscoe. Do not fish when the water temperature is above about 20°C — the catch-and-release mortality in warm water here is high enough to be a real problem.

How does the water behave?

The Beaverkill has no dam, so it lives and dies by rain. Spring flows are good; by mid-July the river is often down to 150 cfs and above 22°C in the afternoons, at which point the correct decision is to go and fish the Delaware tailwater instead. A heavy June thunderstorm will bring it up and cool it for two or three days — those are the days to be there.

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