Idaho
Henrys Fork at Ashton
Location Snapshot
Henrys Fork at Ashton is an eastern Idaho trout reach in the Ashton corridor, downstream from and distinct from the upper-river fishery near Island Park. Rainbow and brown trout define the fishing opportunity, with riffles, runs, and broad river water giving this reach a classic western trout-river character.
Current River Rating
Fair · 56
Conditions are mixed. Review the details below before heading out.
Scores are model-specific and are not directly comparable across water types.
Partial water evidence · Medium confidence
Should I Go?
Wait
Timing Outlook
This timing outlook is informational only; current river conditions remain Fair.
Why
- Very clear skies may make trout more cautious in shallow water.
- Water temperature is unavailable.
Favorable Factors
- Recent precipitation has been light.
- Light wind should make casting and boat control easier.
Timing Evidence
Dawn low light is favorable.
Current Readings
- Flow
- 636 CFS
- Gage Height
- 2.74 ft
- Water Temperature
- Not available
- Observation Time
- Oct 21, 2026, 12:15 AM
Updated recently · USGS station 13046000 · 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
55°F
Feels like
49°F
Wind
7 mph SE
Wind gust
7 mph
Current precipitation
0.00 in
Updated
Oct 20, 2026, 7:15 PM
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 8 PM
Clear
Temp 51°F
Chance 1%
Precip 0.00 in
Wind 6 mph
Wed 12 AM
Clear
Temp 46°F
Chance 2%
Precip 0.00 in
Wind 9 mph
Wed 4 AM
Clear
Temp 46°F
Chance 7%
Precip 0.00 in
Wind 9 mph
Wed 8 AM
Drizzle
Temp 47°F
Chance 25%
Precip 0.00 in
Wind 4 mph
Wed 12 PM
Clear
Temp 59°F
Chance 6%
Precip 0.00 in
Wind 7 mph
Wed 4 PM
Clear
Temp 66°F
Chance 2%
Precip 0.00 in
Wind 4 mph
Four-Day Forecast
Tue, Oct 20
Overcast
High 66°F / Low 42°F
Chance 12%
Precip 0.00 in
Max gust 14 mph
Wed, Oct 21
Drizzle
High 66°F / Low 45°F
Chance 30%
Precip 0.03 in
Max gust 14 mph
Thu, Oct 22
Drizzle
High 71°F / Low 44°F
Chance 58%
Precip 0.06 in
Max gust 14 mph
Fri, Oct 23
Showers
High 53°F / Low 41°F
Chance 97%
Precip 1.20 in
Max gust 30 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
Wild brown and rainbow trout are in the Henrys Fork at Ashton.
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
- Mixed flow regime
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 at Ashton.
Regulation Summary
Henrys Fork at Ashton: IDFG Upper Snake Vernon Bridge-to-Ashton Dam special rules. Confirm current 2025-2027 Fishing Seasons & Rules.
Target Species
brown-trout, rainbow-trout, brook-trout
Access, Parking, and Regulations
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