Henry's Fork (Upper Henrys Fork)
spring creek in Idaho
The Henry's Fork of the Snake River (Upper Henrys Fork) is one of North America's premier trout rivers, with long hatches, abundant browns and rainbows, and famous freestone/ spring-fed runs and riffles from Island Park to Rexburg.
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.
Past reports week by week
12 weeksWhat to tie on
Picked from reports, hatches and the season. Tap a fly for the recipe and where else it works.
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.
Mahogany Dun
Matches the actively hatching Mahogany Duns, a key fall insect on the Henry's Fork.
Buy at AmazonZebra Midge
Midges are a primary and consistent food source year-round, and this pattern is highly effective subsurface for enticing finicky trout and whitefish as water temperatures drop on the Henry's Fork.
Buy at AmazonBlue-Winged Olive (BWO) Comparadun
BWOs are actively hatching in the fall, especially on overcast days, and this low-profile dry fly is excellent for selective trout.
Buy at AmazonWhere to fish and who to ask
Box Canyon / Upper River (Island Park)
Popular early-morning dry-fly and nymph water with extensive wade access and long glides.
Harriman State Park / Falls Area
Classic dry-fly water with runs, tailouts and good public access through Harriman State Park.
St. Anthony / Conant Creek region
Lower Henry's Fork access and popular float/kayak put-ins with consistent trout fishing.
Fly shops within 40 miles
TroutHunter
Henry's Fork Anglers
Three Rivers Ranch Outfitters
Madison River Outfitters
Get Henry's Fork (Upper Henrys Fork) reports by email
Save this water and we'll email you a weekly summary of conditions, hatches and what's working.
Idaho season by season
What changes on the water through the year, with the flies for each season.
Read before you go
Winter Fly Fishing: Essential Cold Weather Tips & Tactics
Master winter fly fishing with proven cold weather strategies, gear selection, and tactics for catching trout when temperatures drop.
How to Pick the Right Fly Rod Weight for Any Situation
Master fly rod weight selection with expert guidance on matching rod power to fish species, water conditions, and fishing techniques for optimal performance.
Fly Line Types Guide: WF, DT, Running & Shooting Heads
Master fly line selection with our comprehensive guide to weight forward, double taper, running lines, and shooting heads for every fishing situation.
Best Fly Fishing Waders of 2025 – Breathable vs. Neoprene
Expert comparison of breathable and neoprene waders with top 2025 models for every budget and fishing condition.
Best Fly Fishing Sunglasses: Lens Color & Polarization Guide
Master lens color selection and polarization technology for superior vision and fish detection on the water.
Fly Fishing Nets – Rubber vs. Nylon & Why It Matters for Fish
The net you choose dramatically impacts fish survival. Here's why rubber nets are superior to nylon for catch-and-release success.
Quick answers
Common questions about Henry's Fork (Upper Henrys Fork).
What flies work best on Henry's Fork (Upper Henrys Fork)?
Our top scored fly patterns for Henry's Fork (Upper Henrys Fork) right now are Copper John (80% confidence), Olive Woolly Bugger (80% confidence), PMD (Pale Morning Duns) (80% confidence). These picks are scored from recent fishing reports, hatch data, and seasonal patterns.
What fish species are in Henry's Fork (Upper Henrys Fork)?
Henry's Fork (Upper Henrys Fork) holds Rainbow Trout, Mountain Whitefish, Brook Trout. See the species links on this page for fly recommendations and seasonal behavior for each.
What are current flow conditions on Henry's Fork (Upper Henrys Fork)?
Live USGS streamflow readings for Henry's Fork (Upper Henrys Fork) are charted in the sidebar of this page and updated automatically from the nearest gauge.
Is Henry's Fork (Upper Henrys Fork) fishing well right now?
We publish a fresh bite report for Henry's Fork (Upper Henrys Fork) each week based on recent on-the-water intel. The current report — with conditions, hatches, and what's producing — is on this page.