The upper river: Downsville dam to the mouth of the Beaverkill
Start at the covered bridge in Downsville, below the Pepacton Reservoir dam that New York City finished in 1954. From here down to the hamlet of East Branch the river follows Route 30, and the upper East Branch is the part most trout anglers mean when they say the name. It is slower and deeper than the West Branch, with weed beds, long flat pools and browns that Hackett Fly Fishing calls the spookiest in the Catskills. Access is by public pull-offs and public fishing rights along Route 30, with the Downsville covered bridge, Corbett Bridge and Shinhopple the landmarks people navigate by. Al's Sport Store in Downsville runs rafting on this stretch, which tells you something about how gently it flows.
The reservoir release is what keeps this reach a trout river through July and August, and Dette Flies' late-summer reports have the East Branch turning on close to dark when the West Branch fishes in the afternoon. Fish it in the evening with a long leader, a downstream reach cast and a fly-first drift; Dette's shop advice is that your first few drifts over a rising fish are the ones that count.
Where the Beaverkill comes in, and why the river changes
The Beaverkill joins at East Branch, just off Route 17 at exit 90, and everything below is the lower river. It runs another 17 miles to Junction Pool at Hancock, wide and open, with the Fishs Eddy bridge, Cadosia and Hancock the only public parking of note and most of the banks between them private. The Beaverkill is a freestone, so it brings the lower East Branch warm water in summer: Hackett notes the lower river can quickly become too warm to fish ethically and that midsummer catches are mostly smallmouth and the occasional walleye. Rainbows and rogue browns show up in the right places at the right flows, which is why the lower East is guide water more than walk-in water.
The upshot is a river that fishes on two different calendars. April through June and again from September, the lower river is worth a float. In July and August stay above the Beaverkill, and if the Hancock gauge temperature is running 60 to 63 degrees, as it was on several September mornings in 2026 while Harvard read 51 to 54, fish the upper river or go to the West Branch.
Reading the Harvard gauge before you drive
The Harvard gauge sits below Shinhopple, upstream of the Beaverkill, so it measures the tailwater alone. Cross Current Outfitters publishes a wading table for exactly this reach: at 250 to 500 cfs, 75 to 95 percent of the upper East Branch is wadeable; at 600 to 800 about half; at 900 and above do not wade. Dette Flies gives 250 to 650 cfs as the ideal window for the East Branch, and the two agree well enough that 250 to 500 is the number to compare today's reading against. Cross Current's separate table for the lower river runs higher, 700 to 800 cfs for 90 percent wadeable, because it includes the Beaverkill.
The USGS record at Harvard shows how narrow the good window is: the monthly median is about 680 cfs in April, 420 in May, then 180 to 225 from June through September, rising again to around 300 in October and November. Spring is a boat, summer is a wade, and a Pepacton release change can move the number overnight. The Delaware River Club's daily report lists Harvard, Hancock and the reservoir release together, which saves checking three pages.
Hatches on the cold side of the Beaverkill
The upper East Branch shares the Upper Delaware calendar that the Delaware River Club charts, shifted later by the cold release. Hendricksons and Quill Gordons run from mid-April into May, with Blue Quills and Grannoms alongside. March Browns and Gray Fox overlap the first Sulphurs in mid-May, Green Drakes and Brown Drakes come in the first weeks of June, and the Sulphurs continue into July. Isonychias, Light Cahills and Tricos carry July through September, and the September 2026 shop reports had olives, Cahills, Isonychias and flying ants on the water. Blue-Winged Olives are on the river in some size from late March through November, and the DRC's September reports note the hatches getting steadier as flows drop and nights cool. West Branch Angler's monthly list matches this sequence for the whole Upper Delaware system.
Silt after Debby, and what changed in 2024
One caution that predates any flow reading. In August 2024 the remnants of Hurricane Debby pushed the Harvard gauge to about 9,000 cfs, and Tony Bonavist, a retired DEC fisheries biologist who has fished the East Branch since 1959, wrote in the River Reporter that the river stayed milky for weeks afterward and left fine silt across the meadows below Downs Brook, something he had not seen even after Irene's flows above 10,000 cfs cleared quickly. He suspected a breached bank somewhere below Downsville. If the upper river is off-color after a moderate rain when the West Branch is clear, that is why, and the Beaverkill and West Branch are the fallbacks.
Wild-Premier from Hancock up to the Downsville bridge
NYSDEC manages the whole East Branch from its confluence with the West Branch upstream to the Route 206/30 bridge in Downsville as a Wild-Premier trout stream: April 1 through October 15 the daily limit is one trout of any size, and from October 16 through March 31 it is catch and release only with artificial lures. There is no separate no-kill reach on the East Branch and no stocking; the older guidebook line about the season running to November 30 below Shinhopple no longer applies. The Beaverkill's own reaches carry different rules, so the boundary at East Branch matters if you wade up into the tributary. The East Branch is entirely New York water, and the Pennsylvania reciprocity that covers the West Branch and the main stem does not reach it.