Idaho
Henrys Fork near Island Park
Location Snapshot
Henrys Fork near Island Park is an upper eastern Idaho trout river shaped by spring-fed water, broad meadow reaches, and regulated flow below Island Park Reservoir. Rainbow trout are the defining target, with brown trout adding another established salmonid opportunity.
Current River Rating
Unavailable
Not enough local guidance to rate conditions.
Low confidence
Should I Go?
Not Enough Data
Timing Outlook
No reliable fishing window is available with the current data.
Why
- This river does not yet have enough local fishing guidance to assign a rating.
Cautions
- Water temperature is unavailable.
Blocking Factors
- Configured water observations are currently unavailable.
Current Readings
- Flow
- Not available
- Gage Height
- Not available
- Water Temperature
- Not available
- Latest current reading
- Not available
Monitoring temporarily unavailable. · USGS station 13042500 · Direct monitoring location
Readings from past 7 Days
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Historical readings are provided for context. Readings outside the current freshness window are not used to rate current conditions.
Better Nearby Options
Checking nearby StrikeTracks waters…
Preliminary guidance only. Always assess current weather, access, water depth, current speed, and your own ability before entering the river.
Changing Conditions Advisory
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Weather Near Gauge
Current Weather
Clear
Temperature
36°F
Feels like
28°F
Wind
7 mph NE
Wind gust
12 mph
Current precipitation
0.00 in
Updated
Oct 20, 2026, 1:15 AM
Recent Rainfall
Estimated precipitation near this gauge
Last 6 hours
0.00 in
Last 24 hours
0.00 in
Last 48 hours
0.00 in
Little recent rainfall near this river.
Next 24 Hours
Tue 4 AM
Clear
Temp 35°F
Chance 1%
Precip 0.00 in
Wind 6 mph
Tue 8 AM
Overcast
Temp 34°F
Chance 2%
Precip 0.00 in
Wind 7 mph
Tue 12 PM
Overcast
Temp 57°F
Chance 1%
Precip 0.00 in
Wind 6 mph
Tue 4 PM
Clear
Temp 60°F
Chance 1%
Precip 0.00 in
Wind 6 mph
Tue 8 PM
Overcast
Temp 48°F
Chance 1%
Precip 0.00 in
Wind 4 mph
Wed 12 AM
Clear
Temp 41°F
Chance 4%
Precip 0.00 in
Wind 6 mph
Four-Day Forecast
Tue, Oct 20
Overcast
High 60°F / Low 34°F
Chance 3%
Precip 0.00 in
Max gust 12 mph
Wed, Oct 21
Rain
High 60°F / Low 37°F
Chance 9%
Precip 0.13 in
Max gust 16 mph
Thu, Oct 22
Drizzle
High 66°F / Low 43°F
Chance 63%
Precip 0.11 in
Max gust 21 mph
Fri, Oct 23
Showers
High 49°F / Low 38°F
Chance 97%
Precip 1.49 in
Max gust 17 mph
Weather and rainfall are estimated for this river's coordinates. Local conditions can vary, especially in mountainous terrain and during isolated storms.
Recent rainfall can influence river flow, but the timing and magnitude depend on watershed size, soil conditions, upstream reservoirs, and dam releases.
Weather data: Open-Meteo
Historical Flow
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Fishing Overview
The Henrys Fork near Island Park is the section from Island Park Dam downstream to the upper boundary of Harriman State Park.
Fishery Profile
Documented species you may encounter at Henrys Fork.
Species images are AI-generated illustrations for visual reference and may simplify natural variation. Fishery records are based on the cited agency sources. About fish illustrations
Target species
Brown Trout
Salmo trutta
- Expectation
- Primary
- Population
- Wild
- Native status
- introduced
- Confidence
- High confidence
Rainbow Trout
Oncorhynchus mykiss
- Expectation
- Primary
- Population
- Unknown
- Native status
- introduced
- Confidence
- High confidence
Brook Trout
Salvelinus fontinalis
- Expectation
- Present
- Population
- Wild
- Native status
- introduced
- Confidence
- High confidence
Fishery characteristics
- Composition
- Wild
- Great Lakes tributary
- No
- Flow regime
- Tailwater
Best seasons
- Spring
- Summer
- Fall
Common techniques
- Dry flies
- Fly fishing
- Nymphing
- Spinning
- Streamers
Official sources
Hatch Match
General fly suggestions
- Parachute-style dryGeneral attractor dry family — not a claim that a named mayfly is hatching.
- Pheasant-tail-style nymphGeneral nymph family for trout rivers without destination hatch timing.
- Elk-hair-style dryGeneral dry/attractor family. Pattern choice only — not a report that caddis are hatching.
- Woolly-bugger-style streamerGeneral streamer family. Not a forage or insect Hatch event.
These are general fishing suggestions, not a report of insects currently hatching at this destination.
Location and Access
USGS monitoring location
Fremont, Idaho
The map marker represents the cataloged waterbody or monitoring location and may not indicate legal parking or public access. Confirm access through the official information before visiting.
River Details
County
Fremont
Management Category
Wild trout river
Regulation Scope
Henrys Fork near Island Park / Island Park Dam section.
Regulation Summary
Henrys Fork near Island Park: IDFG Upper Snake Island Park Dam / Harriman map sections. Confirm current 2025-2027 Fishing Seasons & Rules.
Target Species
brown-trout, rainbow-trout, brook-trout
Access, Parking, and Regulations
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