West Branch Delaware Fishing Report: August 19, 2026

Quick Summary

The West Branch remains the best New York trout option in this morning's report set. USGS showed 674 cfs, 3.09 feet, and 49.3 F at Hale Eddy during the 8 AM check, with Stilesville at 560 cfs, 8.14 feet, and 47.5 F below Cannonsville. That is cold, steady tailwater water for August, with enough flow to favor drift boats and selected wade spots rather than casual crossings. Current Upper Delaware source context points to a 549 cfs Cannonsville release, good summer flows, cooler nights, flying ants, tapering sulphurs, olives, Isonychias, and Cahills; keep the upper river mostly dry-fly focused where algae makes nymphing inefficient.

Conditions Snapshot

Field	Value
Status	Good. Cold tailwater temperatures and stable flow keep the West Branch fishable, with algae on the upper river and selective late-summer fish as the main limitations
Flow	674 cfs at Hale Eddy; 560 cfs at Stilesville during the 8 AM check
Gauge Height	3.09 feet at Hale Eddy; 8.14 feet at Stilesville
Water Temp	49.3 F at Hale Eddy; 47.5 F at Stilesville
Clarity	Not reported by official gauges; current local context describes the system as fishable with good flows
Trend	Stable to slightly falling compared with yesterday morning
Best Window	Midday through afternoon on the colder upper West Branch, then evening soft light if wind and showers stay light
Best Method	Dry flies and emergers on the upper West Branch; nymph or swing wets lower only where algae is not fouling the rig
Wadeability	Limited. Fish familiar bars, edges, and soft inside seams, and avoid unnecessary crossings

Weather

For Hancock and Hale Eddy, the National Weather Service forecast calls for patchy fog before 9 AM, then mostly sunny skies with a slight chance of showers or thunderstorms and a high near 81 F. Southwest wind is forecast at 1 to 6 mph, with less than a tenth of an inch of new rain possible. Tonight has a slight early shower or thunderstorm chance, then patchy fog and a low around 57 F. The light wind helps dry-fly fishing, but the sun can make fish pickier until clouds, shade, or evening light improves the surface window.

River Notes

Hale Eddy is nearly unchanged from yesterday morning's 684 cfs reading, while Stilesville remains at a steady 560 cfs release. That combination gives the upper river dependable cold water without making wading wide open. Treat the West Branch as fishable but not casual: choose known access, avoid long crossings, and keep boat traffic in mind.

Current Upper Delaware local context says flows are at good levels, cooler nights are helping temperatures, and any light showers should not materially change river level. It also notes algae problems on the upper West Branch, so a heavy nymph program can turn into constant cleanup. If you want subsurface fishing, look lower on the West for cleaner seams; if you stay up high, spend more time watching for individual feeders and fish precise dries, emergers, or soft hackles.

Hatch Activity

Official gauges do not report hatches. Current Upper Delaware source context supports flying ants, spotty but still useful sulphurs, Blue Winged Olives, a few Isonychias, Cahills, and tan caddis. The sulphur hatch is waning, but it remains part of the daytime plan on the coldest water; ants are worth keeping ready after the recent humid stretch.

Hatch	Size	Notes
Sulphur	16-20	Spotty and tapering, but still a key cold-water daytime hatch on the upper West Branch
Blue Winged Olive	16-24	Carry for mixed hatches, cloudy periods, small riseforms, and soft edges
Flying Ant	16-20	Important late-summer wildcard around banks, slicks, and foam lines
Tan Caddis	16-20	Useful as pupa, emergers, or small adults in broken current
Isonychia	10-14	Good searching bug as a nymph, wet fly, or dry in faster bankside water
Light Cahill or Summer Steno	14-16	Carry for mixed afternoon and evening activity

Recommended Flies

Category	Fly	Size	Notes
Dry	Sulphur Sparkle Dun, CDC Emerger, or Comparadun	16-20	Use when upper-river fish key on small yellow mayflies
Dry	BWO Comparadun or CDC Olive	16-24	Match quiet riseforms, clouds, or mixed olives around sulphurs
Dry	Flying Ant or Beetle	16-20	Fish banks, slicks, and foam seams when trout ignore mayflies
Dry	Isonychia Parachute or Light Cahill	10-16	Search faster edges and broken current before fish lock onto tiny bugs
Wet	Soft Hackle Pheasant Tail, Soft Hackle Sulphur, or Isonychia Wet	12-18	Swing through riffles and seams before the surface bite starts
Nymph	Pheasant Tail, Frenchie, or Sulphur Nymph	14-20	Best on cleaner lower-West seams where algae is not constantly fouling the rig
Nymph	Isonychia Nymph	10-12	Let the fly lift or swing near ledges and bankside current

Tactics

Start by looking before casting. If the upper river shows heads, fish a long leader with one accurate dry or a dry-and-emerger pair, and make the first drift count from downstream or across-and-down. If the water is quiet, swing soft hackles through broken seams or move lower to nymph cleaner runs where algae is less of a problem. Keep wading conservative at 674 cfs, and use the West Branch rather than warmer freestones if the afternoon pushes trout water toward 68 F elsewhere.

Gauge Links

Gauge	Flow	Temp	Link
WEST BRANCH DELAWARE RIVER AT HALE EDDY NY	674 cfs	49.3 F	USGS 01426500
WEST BRANCH DELAWARE RIVER AT STILESVILLE NY	560 cfs	47.5 F	USGS 01425000

Sources

Official sources checked: USGS stations 01426500 and 01425000, plus the National Weather Service forecast for the Hancock and Hale Eddy, NY area. This report is an original Custom FlyBox summary based on current official gauge and weather data, with local public conditions reports reviewed separately for hatch, method, clarity, and safety context.