Cool and clear on the West Branch, warm and thin everywhere else — plan around the edges of the day, not the middle.
Upper Delaware River Fishing Report: Conditions
The West Branch has settled back toward baseline after last week’s rain bump — flows spiked and have been easing down since, with clear water and good wading throughout. The Main Stem is carrying more volume and running noticeably warmer, typical for mid-August.
The East Branch, Beaverkill, and Willowemoc have all thinned out considerably after the dry stretch — several sections are down to skinny freestone flows and warmer than you’d want to push a fish in.
Afternoon storms have been rolling through on and off, keeping flows twitchy rather than stable — check a gauge before you head out rather than trusting yesterday’s numbers. For real-time flows, radar, and forecasts, check the Live Report — it’s the fastest way to know before you go.
What’s Hatching
- Sulphurs — #16–20
- Dark Blue-Winged Olives — #16–20
- Light Cahill — #14–16
- Isonychia — #10–14
Sulphurs remain the backbone of the day — reliable around midday on the lower stretches and again in the evening system-wide. Caddis are around but playing a secondary role right now. Expect the standard late-summer pattern: a quieter midday window bookended by better action at both ends of the light.
Today’s Watch Items
- The Beaverkill’s Acid Factory section remains closed as a thermal refuge through the end of August — give that water a pass entirely
- Some smaller tributary and private-water sections have gone into summer shutdown as flows and temps climbed — if a spot feels off-limits or posted differently than usual, that’s likely why
- Carry a thermometer on the Beaverkill and Willowemoc especially, and be ready to walk away from water pushing past the high 60s
Best Techniques
Surface windows are real but narrow this time of year, so a clean drag-free drift and a downstream-first presentation will get you further than fly selection alone. When nothing’s rising, a two-fly nymph rig fished near the bottom is a solid default, and in the clearer low water, downsizing your streamer profile tends to outperform going bigger.
When the sun’s high, give the pressured, open water a rest and put your time into slower, structure-heavy holding water instead — that’s where fish sit tight through the worst of the heat. Early and late are still your highest-percentage windows system-wide, so if you can only fish part of the day, build your trip around first light or last light rather than the middle hours.
Fly of the Week
The Sulphur
Ephemerella dorothea · Sizes 16–18
Pale yellow, honest profile.
Matching the hatch driving both the midday and evening action across the system right now — a dependable first choice when fish are up.
See live conditions on the Live Report →Upper Delaware River fishing report, covering the West Branch, East Branch, Main Stem, and Beaverkill & Willowemoc. Flows, hatches, technique, and today’s watch items — everything you’d want to know before you string up a rod, gathered from conditions across the watershed.