Wade0/100
Wading is the most sensitive plan today. Use protected edges only, avoid crossings, and downgrade quickly if clarity or current feels wrong.
All Idaho reports
Fly fishing report · West
Henry's Fork Fishing Report — St. Anthony, Idaho
Is Henry's Fork worth the trip today? Check flow, weather, hatches, access, and rules for St. Anthony, 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.
23
Best option: Float. A float can fit better than wading only if launches, shuttle, boat skill, wind, and local rules all check out.
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, 8:21 PM MDTUsually checks again about every 45 minutes
Best access methodFloat
These scores compare the risks of wading, bank fishing, and floating.
Bank / edgeNot recommended
This report does not recommend bank fishing on this reach.
Float · Best fit3/100
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.
The St. Anthony area is broader, slower, and more wind-sensitive than the famous upper river. Use the St. Anthony gauge first, then decide whether you want a short float, a bank-and-slough day, or a different river entirely if weeds, wind, or summer traffic stack against you.
- Check first
- Use RiverReports first for the public chart, then confirm the lower-river trend with USGS 13050500 at St. Anthony.
- Try
- Pick one access area and fish it with purpose instead of trying to sample every launch between St. Anthony and Menan.
- Leave when
- Skip when hard valley wind, thick weed mats, or crowded launches turn the lower river into a boat-control problem instead of a fishing problem.
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
- 1,160 cfs
- From the latest stored river check. Open the official source for the newest reading.
- Air now
- 81°F
Current NWS forecast period
- Next 24h high
- 86.0°F
NWS air forecast near
- Rain chance
- 36%
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
- 9 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 St. Anthony forecast point
The National Weather Service forecast is temporarily unavailable.
Live data
Where these readings come from
RiverReports gauge: Henrys Fork at St. Anthony
How to fish it
How to fish Henry's Fork today.
The lower Henry's Fork is most useful when flows are steady, afternoon wind stays reasonable, and you have a clear launch or walk-in plan. It loses value fast when anglers show up expecting upper-river dry-fly precision from a much broader lower-valley system.
Lower steady flow
Best for side-channel scouting, cleaner weed lanes, and manageable bank or boat angles.
Stable medium flow
A good all-around lower-river level if wind and boat traffic stay modest.
High or pushy flow
Focus on launch-to-takeout planning first because the river spreads out and loses easy wading options quickly.
Heavy weed and wind
Downshift expectations, fish sheltered lanes, and avoid pretending every drift needs to be forced.
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.
- 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.
- Confluence
- A confluence is the place where two streams or rivers meet.
- 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.
HeatUse caution
The current NWS air forecast is about 81F, and the next 24-hour high reaches about 86F. 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.
FlowHelps
USGS shows 1,160 cfs. The flow has been stable over about 6 hours. USGS marks this reading provisional and may revise it. USGS records for this date (1919-2025, 107 readings) show a typical middle range of 960 cfs to 1,400 cfs. Flow is within the typical range for this date, so weather, temperature, and access become the next checks.
Trip notes
Trip notes
Check these before you choose a reach.
Stable lower-river flows that keep side channels defined without flooding soft banks or turning weed lanes into constant fouling.
Skip when hard valley wind, thick weed mats, or crowded launches turn the lower river into a boat-control problem instead of a fishing problem.
Use the St. Anthony gauge first, pick one access cluster like Red Road or Warm Slough, and commit to a shorter cleaner day instead of chasing miles of similar-looking lower water.
If the lower Henry's Fork is too weedy or windy, move to the Ashton-focused Henry's Fork route for a different style or switch to the South Fork Snake if you still want a larger drift-day setup.
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 caddis
Early summer
What to look forCaddis, PMDs, and stonefly leftovers
SummerCurrent
What to look forCaddis, terrestrials, and evening spinner windows
Flies to try
Also try Hopper-dropper
Fall
What to look forBWOs, midges, and small streamers
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's 2025-2027 Henry's Fork rules split the river into multiple sections. The lower reach from the South Fork Snake confluence upstream to Vernon Bridge carries a 2-trout limit with no cutthroat harvest, while upstream reaches shift into more restrictive seasonal and gear rules. Check the current rulebook before choosing your section.
Red Road Bridge boat access
The best lower-river BLM starting point for a St. Anthony-facing float plan.
Warm Slough access site
Important IDFG launch and day-use anchor when you want easy public staging close to the lower area.
Menan Butte and Beaver Dick takeout area
Useful downstream public access when you want a shorter or more deliberate float finish.
BLM's Henry's Fork access page is the cleanest official summary for lower-river launch and takeout choices around St. Anthony and Menan.
Warm Slough remains an important public access, but IDFG's 2025 site note means anglers should treat it as day-use only from February 1 through September 30.
Lower-river access is friendly compared with more remote Idaho fisheries, but wind, weeds, and float timing still punish casual planning.
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, and public-access 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.
What part of Henry's Fork does this page cover?
This page is built for the lower St. Anthony-to-Menan area, not the technical ranch and Ashton water farther upstream.
Is this mostly a wade river or a float river?
It can be both, but the lower river makes the most sense when you plan around public launches, side channels, and a realistic float or bank-access lane.
What gauge should I trust for this reach?
Start with RiverReports and USGS 13050500 at St. Anthony because they match the lower-river area far better than the upstream Ashton gauge.