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Fly fishing report · West
Henry's Fork
An Ashton-focused Henry's Fork planning page built around the classic ranch and reservoir-to-river corridor, strict section-by-section rules, and flow-aware dry-fly timing.
Check flow & weatherToday's fishing decisionMost live data available
29
Skip today
Do not commit until the safety issue clears.
Red Flag Warning issued August 2 at 1:04AM MDT until August 2 at 9:00PM MDT by NWS Pocatello ID
Best supported approachNo approach recommended
Watch nextRed Flag Warning issued August 2 at 1:04AM MDT until August 2 at 9:00PM MDT by NWS Pocatello ID
Updated Aug 3, 1:06 AM UTCUsually refreshes about every 45 minutes
Red Flag Warning issued August 2 at 1:04AM MDT until August 2 at 9:00PM MDT by NWS Pocatello ID
Safety overrides tacticsNo approach recommended
The active safety or closure reason takes priority over wading, bank fishing, and floating guidance.
Check before you drive
Current flow and weather.
Look at whether the river is rising or falling, then check wind, rain, and storms. These can change both safety and fishing.
Loading current flow and weather.
Before you rely on this report
How current is this report?
Conditions can change quickly. Check these dates before you decide to fish, and open the official source when safety or rules matter.
- River conditions
- Checked Aug 2, 2026, 9:06 PM
- Fishing guidance
- Reviewed Jun 2, 2026
- Public access
- No reviewed map pin available
- Rules and closures
- Official rule links checked
High confidence in the current score inputs.
6 sources are listed below for you to open.
3 public access records are listed. Private spots are never shown.
Source checked Jul 30, 2026
Plan your access
Know where you can enter.
These are public parking, launch, trail, or recreation areas—not secret fishing spots. We never show an angler's private pins, notes, or photos here.
- 0
- Shown on map
- 3
- No map pin
Location checkedDescription only
01No map pin
Area description
Ashton-area public access and dam corridor
Best starting point for gauged water and lower-upper corridor decisions.
Restrictions and seasonal notes
IDFG makes it clear the Henry's Fork has section-specific rules, so do not assume one reach's rule set applies to the whole river.
The BLM Red Road and related downstream sites are most useful when you are planning a St. Anthony-to-Menan style float, not a classic Harriman walk-and-wade day.
02No map pin
Walk-in / wade
Riverside Campground reach
Useful official Forest Service anchor for the upper Ashton corridor and nearby walk-in water.
Restrictions and seasonal notes
IDFG makes it clear the Henry's Fork has section-specific rules, so do not assume one reach's rule set applies to the whole river.
The BLM Red Road and related downstream sites are most useful when you are planning a St. Anthony-to-Menan style float, not a classic Harriman walk-and-wade day.
03No map pin
Public land
Red Road Bridge and downstream BLM access
Official lower-river float and bank access that matters when your plan drifts below the classic Ashton water.
Restrictions and seasonal notes
IDFG makes it clear the Henry's Fork has section-specific rules, so do not assume one reach's rule set applies to the whole river.
The BLM Red Road and related downstream sites are most useful when you are planning a St. Anthony-to-Menan style float, not a classic Harriman walk-and-wade day.
How to fish it
Match your section to the rules before you match the hatch.
Henry's Fork is not one uniform fishery. Use the Ashton-area gauge first, then choose a reach that fits current rules, your wade-or-float plan, and the level of pressure you want to handle.
- Use RiverReports first for the public chart, then confirm the Ashton-area trend with USGS 13046000.
- IDFG applies different rules between Vernon Bridge, Ashton Dam, Riverside, Harriman Ranch, and upstream water.
- Riverside and Ashton-area access make this a practical wade or float day, but crowds and reach rules matter more than hero-cast fantasies.
- If runoff, weed, or pressure stack against you, move sections early instead of forcing one famous beat all day.
Why the score looks this way
Public alertLowers score
An active alert is in effect: Red Flag Warning issued August 2 at 1:04AM MDT until August 2 at 9:00PM MDT by NWS Pocatello ID. Check public safety sources before going.
FlowUse caution
USGS shows 1,600 cfs with a stable over about 6 hours trend. Today's flow is below the normal seasonal range, which begins near 1,700 cfs. This is below normal, so edge depth, temperature, and pressure matter.
HeatUse caution
The NWS forecast is near 87F. Fish early and verify water temperature where trout stress is possible.
SeasonHelps score
Summer: The classic dry-fly season, but it also draws the most pressure and rewards early start times.
Fishing usefulnessHelps score
Skip or switch sections when runoff, weed, storms, or crowding make the exact style of fishing you want unrealistic.
Read the water
What changes the plan.
The Ashton corridor is strongest when flows are stable, weed load is manageable, and you know whether you want nymph water, ranch-style dry-fly water, or a float-access day. It loses value quickly if you ignore reach boundaries or show up without a flow-based section plan.
Low clear flow
Best for technical dries and lighter nymph rigs, but it also amplifies crowding and sloppy wading.
Stable medium flow
The most flexible condition for choosing between ranch-style dry fly, nymphing, or short float drifts.
High runoff push
Stay out of side channels and soft banks that make crossings or boat exits feel uncertain.
Heavy weed or moss
Downsize expectations, fish cleaner lanes, and switch reaches if the drift keeps fouling.
Your trip plan
Know when to go—and when to skip it.
Best flows
Stable moderate flows that keep weed, side channels, and bank softness manageable while still letting trout hold in predictable lanes.
When to skip
Skip or switch sections when runoff, weed, storms, or crowding make the exact style of fishing you want unrealistic.
Local plan
Check the Ashton graph first, decide whether you want technical dry-fly water or more forgiving riffles, then commit to one section instead of trying to sample the whole river.
Backup water
If Henry's Fork is too crowded or technical for the day you want, look at the South Fork Snake for a different scale or Big Wood for a simpler freestone rhythm after checking current conditions.
Hatches & flies
Bring a flexible box.
TimingWhat to watchUseful flies
SpringMidges, BWOs, and Mother's Day caddis windowsZebra midge, BWO emerger, soft hackle, caddis pupa
Fly pattern · report suggests “Zebra midge”Zebra MidgeLook for a very slim tapered thread body, evenly spaced contrasting wire rib, a small bead, and no tail or wing. The reviewed classic is black with silver wire and a silver bead. Red, olive, brown, glass-bead, jig-hook, resin-coated, or tailed forms must remain labeled variations rather than replacing the classic identity.See photos & how to fish it ↗
Fly family · report suggests “BWO emerger”Blue-Winged Olive PatternsBWO describes a hatch group, not one fly. Nymph, emerger, dry, cripple, and spinner profiles must stay separate because they occupy different parts of the water column.See family guide ↗+ 2 more reviewed guides in the Fly Box Early summerPMDs, caddis, flavs, and green drakesPMD cripple, caddis dry, green drake emerger, split-case nymph
Fly family · report suggests “PMD cripple”Pale Morning Dun PatternsPMD names an insect group, not one fly. Pale nymphs, trailing-shuck emergers, upright or low-riding duns, cripples, and spent-wing spinners stay visibly separate.See family guide ↗
Fly family · report suggests “caddis dry”Caddis Patterns by StageCaddis is not one fly. Larvae live below, pupae and emergers rise through the column, tent-wing adults ride or move on top, and spent forms create other silhouettes.See family guide ↗+ 2 more reviewed guides in the Fly Box SummerCaddis, PMDs, tricos, terrestrialsRusty spinner, trico cluster, ant, beetle, hopper-dropper
Fly pattern · report suggests “Rusty spinner”Rusty SpinnerSplit tails, a slender rusty body, and flat spent wings form the identifying spinner silhouette. Foam-backed and sunken versions are labeled variants.See photos & how to fish it ↗
Fly family · report suggests “trico cluster”Trico PatternsTrico is a hatch family. Sparse nymphs and emergers fish below or in the film; duns and clustered or individual spinners use different surface silhouettes.See family guide ↗+ 2 more reviewed guides in the Fly Box FallBWOs and midgesParachute BWO, RS2, zebra midge, small streamer
Fly family · report suggests “Parachute BWO”Blue-Winged Olive PatternsBWO describes a hatch group, not one fly. Nymph, emerger, dry, cripple, and spinner profiles must stay separate because they occupy different parts of the water column.See family guide ↗
Fly pattern · report suggests “RS2”RS2Start with the beadless architecture: two dark-dun Microfibett tails separated behind a slim, tightly twisted and visibly segmented dubbed abdomen; a fuller thorax; and saddle-hackle web clipped into a short angled wing bud. Rim Chung's original-style form uses natural beaver dubbing and hackle web. CDC- or Antron-wing ties, beads, curved hooks, flash, and tailless Avatar-style flies must remain labeled variations.See photos & how to fish it ↗+ 2 more reviewed guides in the Fly Box 01
Decide whether you are fishing the Ashton water, Riverside reach, or ranch section before rigging up.
02
Use a conservative first pass on visible risers because repeat casts educate fish quickly here.
03
Float only if your access, takeout, and reach rules all line up; a famous river still punishes lazy shuttle planning.
04
If the river is crowded, change water type before changing six flies in a row.
Rules & closures
Check the official rules before you go.
Open the agency page to confirm the exact river section, species, season, tackle rules, limits, and emergency closures.
Official links checkedRules for this river or sectionSpecial rule found
Special regulation
Henrys Fork regulated reaches
IDFG splits Henrys Fork into reach-specific rules, including catch-and-release periods, barbless and no-bait water, and a Harriman Ranch seasonal closure. Match the access point to the planner.
Rules checkedJul 30, 2026
Report a correction ↗Always follow the official rule
This summary helps with trip planning. The linked agency rule is the one you must follow.
Updates from anglers
What anglers are seeing.
Recent observations from general areas of Henry's Fork. We review every update before it appears and never publish exact fishing spots, private access details, or photo locations.
Angler updates are not loading right now.
You can still use the river plan above. Check back later for recent observations from other anglers.
Where this report comes from
Open the sources we checked.
Fishing guidance checked: Jun 2, 2026
Site check: Jul 14, 2026. We regularly test report links, live scores, flow and weather data, and page loading. The content date changes only when the fishing guidance or its sources change.
flowRiverReports: Henry's Fork near AshtonflowUSGS monitoring location: Henrys Fork near AshtonregulationIdaho Fishing Planner: Henrys Fork Snake RiveraccessCaribou-Targhee National Forest Riverside CampgroundaccessBLM Red Road Bridge Boat Access (Henry's Fork)safetyNational Weather Service forecast point near Ashton
Common questions
Before you leave.
Which Henry's Fork reach does this page cover?+
This page is centered on the Ashton gauge corridor, including Ashton Dam access, Riverside water, and the nearby classic upper river decision points.
Can I treat all of Henry's Fork the same way?+
No. IDFG publishes section-specific rules, and the fishing styles change a lot from the lower float river to the technical upper water.
What gauge should I start with?+
Start with RiverReports and USGS 13046000 near Ashton for this page's corridor, then match that reading to your specific section plan.