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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.
Fishing rating62
Rating updatedRiver local time:
Why this recommendation?
USGS shows 1,150 cfs. The flow has been stable over about 6 hours. USGS marks this reading provisional and may revise it. USGS records for this date (1933-2025, 93 readings) show a median near 756 cfs and a high-water marker near 1,100 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 the Island Park gauge for upper river and Ranch planning.
- Try
- Choose Box Canyon, Ranch, Ashton, or lower river before rigging.
- Leave when
- Skip or change reaches when Harriman Ranch dates or special rules are unclear, when releases make wading or floating unsafe, when wind defeats technical dry-fly fishing, or when crowding would force poor etiquette.
Flow and weather
Showing server-checked river conditions while current readings refresh.
- Flow
- 1,150 cfs
- From the latest stored river check. Open the official source for the newest reading.
- Air forecast
- 50°F
- Next 24h high
- 70.0°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
- 3 mph
- Weather checked
More forecast and source details
Partly Cloudy
National Weather Service
Henry's Fork Island Park forecast point
The National Weather Service forecast is temporarily unavailable.
Live data
Where these readings come from
RiverReports gauge: Henry's Fork near Island Park
Flies for this time of year
Seasonal starting points, not a live hatch report. Match what you see on the water.
- Ant PatternsantView fly guide ↗
- Grasshopper PatternshopperView fly guide ↗
- Caddis Patterns by StagecaddisView fly guide ↗
- Blue-Winged Olive PatternsBWO dryView fly guide ↗
- RS2View fly guide ↗
See flies for every season
SeasonWhat to look forFlies to try
Spring
What to look forMidges, BWOs, caddis
Early summer
What to look forSalmonflies, golden stones, PMDs, green drakes
Mid to late summerThis season
What to look forTricos, callibaetis, terrestrials, caddis
Flies to try
Also try Trico spinner, callibaetis emerger
FallThis season
What to look forBWOs, midges, October caddis
Flies to try
Also try October caddis
Each fly name opens its matching Fly Box guide.
More fishing tips
Methods, fish species and trip notes
How to fish Henry's Fork of the Snake River today.
The Henry's Fork is best when the reach, flow, hatch, and rules all line up. If one section is high, crowded, closed, or wind-hit, use another gauge and choose a different reach.
Stable upper flow
Good for Box Canyon nymphing and Ranch dry-fly planning when wind allows.
High release
Favor boats, edges, and heavy nymphs where legal. Avoid unsafe crossings.
Low clear Ranch water
Use long leaders, careful angles, and match the actual insect stage.
Windy meadow day
Shift to protected edges, Box Canyon, or a lower reach instead of forcing tiny dries.
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 of the Snake River worth the trip today? Check flow, weather, hatches, access, and rules for Idaho before you go.
The Henry's Fork is not one simple report. Box Canyon, Last Chance, Harriman Ranch, Ashton, and St. Anthony all fish differently, so use the Island Park flow and confirm section-by-section rules before you commit.
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.
- 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.
- Pale morning dun (PMD)
- Pale morning duns, or PMDs, are light-colored mayflies that often hatch in warmer months.
- Pocket water
- Pocket water is a small calm spot among rocks or fast current.
Why this call
Why this score
FlowHurts
USGS shows 1,150 cfs. The flow has been stable over about 6 hours. USGS marks this reading provisional and may revise it. USGS records for this date (1933-2025, 93 readings) show a median near 756 cfs and a high-water marker near 1,100 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
Late summer: Terrestrials, tricos, morning spinner falls, and technical sight fishing become central.
WeatherHelps
The current NWS air forecast is about 50F, and the next 24-hour high reaches about 70F. Partly Cloudy.
Public alertsHelps
No active NWS alert was returned for this forecast point.
Trip notes
Check these before you choose a reach.
Use the RiverReports Island Park chart and USGS 13042500 together. Stable releases make the best technical window. Sudden changes, heavy wind, or off-color water should move you to a different reach, safer bank, or another nearby river.
Skip or change reaches when Harriman Ranch dates or special rules are unclear, when releases make wading or floating unsafe, when wind defeats technical dry-fly fishing, or when crowding would force poor etiquette.
Start with the style of day: Box Canyon nymphs and streamers, Last Chance and Ranch dry-fly work, or a lower-river float. Then check access, rules, flows, and wind for that reach rather than relying on one river-wide plan.
If the Henry's Fork is windy, crowded, rule-sensitive, or off-color, compare the South Fork of the Snake, Silver Creek, or Madison River after checking current flows and rules.
Henry's Fork of the Snake River 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 lists detailed Henry's Fork reach rules, including closed water, Harriman Ranch dates, fly-only/barbless sections, and no-bait/catch-and-release reaches.
Where to access the river
Island Park and Box Canyon
Upper tailwater flow reference with faster pocket water and boat/wade options.
Last Chance and Harriman Ranch
Technical meadow water with seasonal and gear restrictions.
Ashton and Mesa Falls area
Middle-river planning with different water speed and access.
St. Anthony and lower Henry's Fork
Lower-river access and boat planning with separate gauge context.
- Rules vary sharply by reach and date.
- Wind can matter as much as flow on slow meadow water.
- Private land and park rules make access checks essential.
- Use multiple gauges if fishing far below Island Park.
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.
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.
How this report was checked
How this report was checked
Reviewed byBlueStreamFly River Review Team
Trip guidance checked
What was checked: This Henry's Fork report is maintained from RiverReports and USGS flow data, Idaho Fish and Game reach rules, BLM Henrys Fork access information, Harriman State Park references, weather checks, and reach-specific trout planning guidance.
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
Which Henry's Fork gauge should I use?
Use Island Park for upper river, Box Canyon, and Ranch planning. Check Ashton or St. Anthony if fishing lower reaches.
When does Harriman Ranch open?
Check IDFG each season. The Ranch has specific closure and fly-fishing-only/barbless language.
Is the Henry's Fork beginner friendly?
Some faster reaches are approachable, but Ranch dry-fly fishing can be very technical.
What should I check besides flow?
Wind, reach rules, access, weed growth, and the actual hatch stage matter.