Box Canyon / Upper River (Island Park)on Henry's Fork (Upper Henrys Fork)
River flow last 30 days
Good fishing conditions on the Upper Henry's Fork
- 01Good fishing conditions on the Upper Henry's Fork, favoring nymphing, dry-dropper, and streamer tactics.
- 02Expect active hatches of Mahogany Duns, Blue-Winged Olives (BWOs), and Pale Morning Duns (PMDs).
- 03Top fly recommendations include Mahogany Dun, BWO Comparadun, PMD (dries), Flashback Pheasant Tail, Copper John, Zebra Midge (nymphs), and Olive Woolly Bugger, Pine Squirrel Leech (streamers).
- 04Focus efforts on the Upper Henry's Fork above Ashton, targeting deeper runs and riffles, but also slower sections for rising fish.
What to tie on at Box Canyon / Upper River (Island Park)
Picked from recent reports for this stretch.
Copper John
A versatile attractor nymph, effective year-round in faster water, ideal for prospecting deeper runs where fish are holding in cooler fall temperatures on the Henry's Fork.
Buy at AmazonOlive Woolly Bugger
A reliable year-round streamer, effective for imitating leeches and baitfish, especially in the colder fall flows of the Henry's Fork, enticing aggressive strikes.
PMD (Pale Morning Duns)
Pale Morning Duns are actively hatching in fall, providing a key food source for opportunistic feeders on the Henry's Fork.
Pine Squirrel Leech (Olive)
Small leech patterns like this effectively mimic sluggish baitfish and annelids in cold water, triggering strikes from larger, lethargic trout in the fall on the Henry's Fork.
Flashback Pheasant Tail
An excellent general searching nymph, mimicking various aquatic insects active subsurface year-round, and particularly effective in fall conditions on the Henry's Fork.
Zebra Midge
The most consistent winter producer on the Henry's Fork. Black or red in sizes 20-22 mimics the prolific midge larvae present in the substrate year-round.
Buy at AmazonBlue-Winged Olive Comparadun
Blue-Winged Olive hatches are active in early spring, especially on overcast days like today, and this low-profile dry fly is excellent for selective trout feeding on emergers and adults.
Mother's Day Caddis
The prolific Mother's Day Caddis hatch is expected in late April through May on Western rivers, making this dry fly a perfect imitation for adult caddis.
Flashback Pheasant Tail Nymph
An excellent general searching nymph for early spring, mimicking various mayfly nymphs (including BWOs) that are active year-round and particularly as BWOs begin to emerge.
Idaho season by season
What changes on the water through the year, with the flies for each season.
Fly shops nearby
Local flies, current advice and guided trips.