WadeNot recommended
This report does not recommend wading on this reach.
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Fly fishing report · West
Henry's Fork Fishing Report — Idaho
Is Henry's Fork worth the trip today? Check flow, weather, hatches, access, and rules for Idaho before you go.
See the flow chart ↓Generated artwork: BlueStreamFly · Regional illustration; not the exact location.
Good day to fish?Latest river check
Poor
Not today. Make another plan.
9
No clear best access mode. Wade, Bank / edge, and Float have the same top score. Use current access, footing, weather, and local rules to choose.
See update time and confidence
Live data checkHighHow much of the live flow, weather, and alert data came back.
Today's callHighA verified hard stop is active, so the avoid-or-wait decision is clearer than the fishing score itself.
Score calculated Aug 22, 2026, 8:18 PM MDTUsually checks again about every 45 minutes
Access choicesNo clear best mode
Wade, Bank / edge, and Float have the same top score. Use current access, footing, weather, and local rules to choose.
Bank / edgeNot recommended
This report does not recommend bank fishing on this reach.
Float0/100
A float can fit better than wading only if launches, shuttle, boat skill, wind, and local rules all check out.
Red Flag Warning issued August 22 at 1:41PM MDT until August 22 at 9:00PM MDT by NWS Pocatello ID
Your plan
Today's Henry's Fork plan.
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.
- Check first
- Use RiverReports first for the public chart, then confirm the Ashton-area trend with USGS 13046000.
- Try
- Decide whether you are fishing the Ashton water, Riverside reach, or ranch section before rigging up.
- Leave when
- Skip or switch sections when runoff, weed, storms, or crowding make the exact style of fishing you want unrealistic.
Live river check
What the river is doing
Check the latest flow and weather before you go. A quick change can make the river harder or less safe to fish.
Showing the latest stored river check while current readings load.
- Flow
- 1,370 cfs
- From the latest stored river check. Open the official source for the newest reading.
- Air now
- 76°F
Current NWS forecast period
- Next 24h high
- 85.0°F
NWS air forecast near
- Rain chance
- 29%
For this forecast period
This is an air forecast, not a river-temperature reading. Check the water with a stream thermometer before fishing in hot weather.
Latest stored weather check
Chance Showers And Thunderstorms
Chance Showers And Thunderstorms
- Wind
- 8 mph
- Weather checked
Recent flow chart is loading
The latest stored reading is shown above. Check the official source below if you need the newest value now.
More forecast and source details
National Weather Service
Henry's Fork near Ashton forecast point
The National Weather Service forecast is temporarily unavailable.
Live data
Where these readings come from
RiverReports gauge: Henrys Fork near Ashton
How to fish it
How to fish Henry's Fork today.
The Ashton area 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.
Fishing words used on this page
- U.S. Geological Survey (USGS) gauge
- A USGS gauge is an official river station that measures flow or water height.
- Cubic feet per second (cfs)
- Cubic feet per second, or cfs, shows how much water passes the gauge each second.
- Technical fishing
- Technical fishing means the fish are hard to fool, so careful casts and natural drifts matter.
- Nymph
- A nymph is a young water insect. Anglers also use the word for a fly that copies it.
- Riffle
- A riffle is shallow, fast water broken by rocks.
- Blue-winged olive (BWO)
- Blue-winged olives, or BWOs, are small mayflies that often hatch in cool or cloudy weather.
- Caddis
- Caddis are small water insects. The adults look a little like tiny moths.
- Dry-dropper
- A dry-dropper rig has a floating fly with an underwater fly tied below it.
- Emerger
- An emerger copies an insect as it rises from below the water toward the surface.
- Midge
- Midges are tiny flies and a common trout food, especially in cold water.
Why this call
Why this score
Public alertHurts
An active alert is in effect: Red Flag Warning issued August 22 at 1:41PM MDT until August 22 at 9:00PM MDT by NWS Pocatello ID. Check public safety sources before going.
Best mode nowHurts
Float: A float can fit better than wading only if launches, shuttle, boat skill, wind, and local rules all check out.
FlowUse caution
USGS shows 1,370 cfs. The flow has been stable over about 6 hours. USGS marks this reading provisional and may revise it. USGS records for this date (1923-2025, 103 readings) show a median near 1,760 cfs and the lower quartile near 1,520 cfs; today's flow is below normal for the date. This is below normal, so edge depth, temperature, and pressure matter.
HeatUse caution
The current NWS air forecast is about 76F, and the next 24-hour high reaches about 85F. This is an air forecast, not a water-temperature reading. Fish early and check the river with a stream thermometer.
Short-term weatherUse caution
The forecast has storm or heavy-precipitation risk, so timing and access matter more than the score alone.
Trip notes
Trip notes
Check these before you choose a reach.
Stable moderate flows that keep weed, side channels, and bank softness manageable while still letting trout hold in predictable lanes.
Skip or switch sections when runoff, weed, storms, or crowding make the exact style of fishing you want unrealistic.
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.
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.
What to try
Henry's Fork flies through the year.
Match the time of year, then let rising fish and current speed guide the next change.
SeasonWhat to look forFlies to try
Spring
What to look forMidges, BWOs, and Mother's Day caddis windows
Early summer
What to look forPMDs, caddis, flavs, and green drakes
SummerCurrent
What to look forCaddis, PMDs, tricos, terrestrials
Flies to try
Also try hopper-dropper
Fall
What to look forBWOs and midges
Each fly name opens its matching Fly Box guide.
Access and safety
Henry's Fork access and rules.
Use these places as starting points. Open the access link below and check posted signs before you park or enter. IDFG lists reach-by-reach Henry's Fork rules, including catch-and-release periods, barbless-hook water, no-bait sections, and the seasonal closure through June 14 on the Harriman Ranch section. Check the current 2025-2027 rules before choosing a reach.
Ashton-area public access and dam area
Best starting point for gauged water and lower-upper area decisions.
Riverside Campground reach
Useful official Forest Service anchor for the upper Ashton area and nearby walk-in water.
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.
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.
Campground, boat-ramp, and state-park popularity make early parking and shuttle discipline part of the plan in summer.
River sources
Official Henry's Fork sources.
Official agencies and primary river operators come first. Secondary tools are labeled so you know what carries the most weight.
How this report was checked
How this report was checked
Reviewed byBlueStreamFly River Review Team
Trip guidance checked
What was checked: This report uses official regulation, flow, weather, access, and public-land sources first, then adds practical planning guidance for fly anglers.
Live measurements and forecasts keep their provider timestamps. Rules, access, and trip guidance use the source-review date shown here. BlueStreamFly planning advice is editorial interpretation, not an agency notice.
First-hand experience: BlueStreamFly does not claim a first-hand visit or local field test for this report unless a real contributor is explicitly named and linked.
Rules and closures
Check what is allowed, where the rule applies, and whether the river is open.
Flow and weather
Check the latest river reading and forecast before you leave.
Access and land
Check public entry points, land rules, and seasonal access changes.
See all 6 checked sources
Rules and closures
Check what is allowed, where the rule applies, and whether the river is open.
What this source covers
Open the current rules and check the river section, season, and special limits.
Flow and weather
Check the latest river reading and forecast before you leave.
What this source covers
Open this page and check the latest safety advice before your trip.
What this source covers
Open this river reading to check the latest level, flow, and update time.
What this source covers
Open this river reading to check the latest level, flow, and update time.
Access and land
Check public entry points, land rules, and seasonal access changes.
What this source covers
Open the land or access page, then check signs before you park or enter.
What this source covers
Open the land or access page, then check signs before you park or enter.
Quick answers
Quick Henry's Fork answers.
Which Henry's Fork reach does this page cover?
This page is centered on the Ashton gauge area, 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 area, then match that reading to your specific section plan.