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Generated lower-river meadow scene representing Henry's Fork near St. Anthony in Idaho, not an exact location photo
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Henry's Fork Fishing Report — St. Anthony, Idaho

Generated artwork: BlueStreamFly · Regional illustration; not the exact location.

Should I go fishing?

Go with caution.

Best option: Floating. A float can fit better than wading only if launches, shuttle, boat skill, wind, and local rules all check out.

Check first: Water temperature is unconfirmed. Use a stream thermometer before fishing.

Rating updatedRiver local time:

Why this recommendation?

USGS shows 1,770 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 median near 1,260 cfs and a high-water marker near 1,690 cfs; today's flow is above that high-water marker. Treat this as high-water fishing: wading, clarity, crossings, and boat control need a conservative check.

Available live dataHighHow much of the live flow, weather, and alert data came back.
Confidence in this recommendationMediumWater temperature not verified; do not use this score to clear warm-water risk.
Usually checks again about every 45 minutes

If you go

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.

Flow and weather

Showing server-checked river conditions while current readings refresh.
Flow
1,770 cfs
From the latest stored river check. Open the official source for the newest reading.
Air forecast
63°F
Next 24h high
80.0°F

NWS air forecast near

Rain chance
0%

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

Partly Cloudy

Wind
10 mph
Weather checked
More forecast and source details

Partly Cloudy

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

Official USGS station Opens in a new tab.RiverReports gauge Opens in a new tab.Official NWS forecast Opens in a new tab.

Flies for this time of year

Seasonal starting points, not a live hatch report. Match what you see on the water.

See flies for every season
SeasonWhat to look forFlies to try

Each fly name opens its matching Fly Box guide.

More fishing tips

Methods, fish species and trip notes

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.

Wading, bank fishing or floating?
Best access methodFloating

These scores compare the risks of wading, bank fishing, and floating.

Wading27/100

Wading is the most sensitive plan today. Use protected edges only, avoid crossings, and downgrade quickly if clarity or current feels wrong.

Bank fishingNot recommended

This report does not recommend bank fishing on this reach.

Floating · Best fit66/100

A float can fit better than wading only if launches, shuttle, boat skill, wind, and local rules all check out.

Full river report

Is Henry's Fork worth the trip today? Check flow, weather, hatches, access, and rules for St. Anthony, Idaho before you go.

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.

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

FlowHurts

USGS shows 1,770 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 median near 1,260 cfs and a high-water marker near 1,690 cfs; today's flow is above that high-water marker. Treat this as high-water fishing: wading, clarity, crossings, and boat control need a conservative check.

Best mode nowUse caution

Float: A float can fit better than wading only if launches, shuttle, boat skill, wind, and local rules all check out.

SeasonHelps

Early fall: Often the cleanest blend of stable weather, lighter crowds, and more deliberate lower-river trout fishing.

WeatherHelps

The current NWS air forecast is about 63F, and the next 24-hour high reaches about 80F. Partly Cloudy.

Public alertsHelps

No active NWS alert was returned for this forecast point.

Trip notes

Check these before you choose a reach.

Best flows

Stable lower-river flows that keep side channels defined without flooding soft banks or turning weed lanes into constant fouling.

When to leave

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.

Local plan

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.

Backup 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.

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.

Before you go

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.

Where to access the river

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.

If this water does not fit the day, check another report before you start the drive.

IdahoHenry's Fork fishing reportThe Ashton corridor is a better fit when you want technical dry-fly water and section-specific upper-river structure.IdahoSouth Fork of the Snake River fishing reportA stronger big-river drift option if you want a more classic boat day than the lower Henry's Fork offers.IdahoBig Wood River fishing reportA better backup when lower-river wind or weeds make you want a simpler wade-focused day.
See all Idaho fly fishing reports

Sources and report details

Official agencies and primary river operators come first. Secondary tools are labeled so you know what carries the most weight.

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.

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.

Source check is old. Last checked . Open the official links now and check for changes.

See something wrong? Report a source problem. Please do not send private spots or private access notes.

How this report was checked

How this report was checked

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.

Quick questions

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.