Box Canyon Accesson Henry's Fork of the Snake River
River flow last 30 days
Strong Blue-Winged Olive (BWO) hatches
- 01Strong Blue-Winged Olive (BWO) hatches, especially on overcast afternoons.
- 02Consistent Mahogany Dun and October Caddis activity providing dry fly opportunities.
- 03Midges and Speckled Spinners remain a year-round staple.
- 04Focus on slower, meandering sections, Harriman Ranch, and Ashton to Funny Farm stretch.
- 05Pay close attention to rise forms; use delicate dry flies/emergers for risers and dry-dropper rigs in faster water.
What to tie on at Box Canyon Access
Picked from recent reports for this stretch.
Zebra Midge
Midges are a primary and consistent food source year-round, and this weighted pattern is highly effective for getting into the strike zone in colder fall water.
Buy at AmazonFlashback Pheasant Tail Nymph
An excellent general searching nymph, mimicking various active mayfly nymphs that are present year-round, especially as BWOs emerge in the fall.
Blue-Winged Olive (BWO) Comparadun
BWOs are actively hatching in the fall, and this low-profile dry fly is excellent for selective trout keying on emergers and adults.
Buy at AmazonBlood Dot Egg
Fall is the egg season below spawning salmon and trout, making egg patterns highly effective for opportunistic feeders.
Buy at AmazonOctober Caddis (Dry)
The October Caddis is the largest caddis hatch of the year in many western rivers, drawing aggressive strikes from trout looking for a substantial meal.
Buy at AmazonMahogany Dun
Mahogany Duns are actively hatching in late summer and fall, providing good dry fly opportunities.
Buy at AmazonZebra Midge
A staple winter tailwater pattern that perfectly imitates midge pupae. Red or black colors in sizes 20-22 are most effective on the Henry's Fork right now.
Buy at AmazonSow Bug
The Henry's Fork has massive populations of aquatic isopods. These are a constant, high-protein food source available to trout throughout the winter months.
Buy at AmazonRS2
An exceptional midge/baetis emerger pattern that is deadly when fished as a trailing nymph or just under the surface film during active midge hatches.
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.