Idaho
Boise River below Anderson Ranch Dam
Location Snapshot
The Boise River below Anderson Ranch Dam is the South Fork Boise tailwater in Idaho, a trout-focused mountain river. Rainbow and brown trout are the primary targets for fly-fishing and light-tackle anglers.
Current River Rating
Fair · 60
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?
Consider
Recommended Window
Tuesday, 1:00 PM–4:00 PM
Why
- Water temperature is within the preferred trout range.
- Air temperature is comfortable for a river trout trip.
- Very clear skies may make trout more cautious in shallow water.
Favorable Factors
- Recent precipitation has been light.
Timing Evidence
Window confidence: High
Current Readings
- Flow
- 309 CFS
- Gage Height
- 3.06 ft
- Water Temperature
- 51.1 °F
- Observation Time
- Oct 20, 2026, 9:15 AM
Updated recently · USGS station 13190500 · Direct monitoring location
Readings from past 7 Days
Loading readings from the past 7 days…
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
Loading advisory…
Weather Near Gauge
Current Weather
Clear
Temperature
51°F
Feels like
44°F
Wind
9 mph NE
Wind gust
10 mph
Current precipitation
0.00 in
Updated
Oct 20, 2026, 3:45 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 51°F
Chance 0%
Precip 0.00 in
Wind 9 mph
Tue 8 AM
Overcast
Temp 50°F
Chance 0%
Precip 0.00 in
Wind 11 mph
Tue 12 PM
Overcast
Temp 67°F
Chance 1%
Precip 0.00 in
Wind 15 mph
Tue 4 PM
Clear
Temp 73°F
Chance 1%
Precip 0.00 in
Wind 13 mph
Tue 8 PM
Clear
Temp 61°F
Chance 1%
Precip 0.00 in
Wind 8 mph
Wed 12 AM
Clear
Temp 57°F
Chance 2%
Precip 0.00 in
Wind 9 mph
Four-Day Forecast
Tue, Oct 20
Overcast
High 73°F / Low 50°F
Chance 2%
Precip 0.00 in
Max gust 23 mph
Wed, Oct 21
Overcast
High 73°F / Low 52°F
Chance 9%
Precip 0.00 in
Max gust 23 mph
Thu, Oct 22
Drizzle
High 72°F / Low 53°F
Chance 83%
Precip 0.22 in
Max gust 26 mph
Fri, Oct 23
Drizzle
High 53°F / Low 45°F
Chance 83%
Precip 0.06 in
Max gust 24 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
Loading historical flow…
Fishing Overview
The South Fork Boise below Anderson Ranch Dam is the water from the dam downstream to Neal Bridge.
Fishery Profile
Documented species you may encounter at Boise River.
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
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
Elmore, 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
Elmore
Management Category
Tailwater trout river
Regulation Scope
South Fork Boise River below Anderson Ranch Dam.
Regulation Summary
South Fork Boise below Anderson Ranch: IDFG Southwest Region Neal Bridge-to-dam special rules. Confirm current 2025-2027 Fishing Seasons & Rules.
Target Species
rainbow-trout, brown-trout
Access, Parking, and Regulations
Loading access and regulations…