California / West
South Fork Trinity River
South Fork Trinity River planning with RiverReports flow, official agency sources, NWS weather, access notes, hatch timing, fly picks, and practical safety guidance.
Image: Generated regional planning image for South Fork Trinity River / BlueStreamFly generated; not exact location / BlueStreamFlyFishability now: South Fork Trinity River fishability today
GreatData confidence: High96/100
Fishable now because the live gauge is stable, weather is mild, and no public alert is active.
Flow observed
5:30 PM UTC
Weather observed
6:00 PM UTC
Score calculated
6:13 PM UTC
Why this rating
Flow
Weather
Public alerts
Next 6-12 hours
Hold
Stable live data supports staying with the plan, but recheck the gauge and forecast before leaving.
USGS flow
332 cfs
Current trend: flow stable, so weather, temperature, and access checks drive the next change.
More planning details: flies, flow bands, and live source checks
Fish it today
Start here
Hyampom, Hayfork, or Weaverville is the practical base. Check cdfw rules, usgs hyampom flow, shasta-trinity nf notices, and road conditions, then pick a short legal access plan instead of trying to cover the whole river.
Best flow clue
Open under CDFW low-flow rules, dropping after rain, and clear enough to fish without stressing salmonids.
Skip trigger
Skip during closures, muddy storm spikes, hot low water, or private-access uncertainty.
Flow decision bands
Low but fishable
Low clear canyon water can fish only when low-flow status is open, temperatures are safe, and remote access is confirmed.
Best remote steelhead window
Stable or falling Hyampom flow with cool weather, open rules, and passable roads is the strongest signal.
Pushy or unsafe
High or rising canyon water, landslide risk, or storm-damaged roads should stop wade and drive-in plans.
Remote-road caution
A good gauge trend is not enough if bridges, forest roads, or weather make the corridor unsafe.
USGS flow
332 cfs
Current trend: flow stable, so weather, temperature, and access checks drive the next change.
Live USGS flow
332 cfs / stable
Live NWS forecast
66F / Sunny
Water temperature not verified
Heat guidance uses weather and river type unless an official water-temperature value is available.
No NWS alert flag
No active NWS alert was returned for this forecast point.
Use RiverReports for a quick chart and USGS 11528700 for official flow context.
CDFW rules, USGS Hyampom flow, Shasta-Trinity NF notices, and road conditions
Shasta-Trinity National Forest lists South Fork Trinity River access, including fishing access from South Fork Trinity River Bridge to Big Slide Campground.
Remote roads, landslides, cold water, high flows, and limited cell service
Editorial review
How this report is maintained
This report uses official regulation, flow, weather, access, and public-source material first, then adds practical angler planning guidance without replacing current rules.
Byline
BlueStreamFly editorial desk
Reviewed by
BlueStreamFly source review
Maintained by
BlueStreamFly
Last material review
2026-05-31
Report confidence
Good confidence
87/100
Good confidence: RiverReports, USGS Hyampom flow, CDFW low-flow and steelhead sources, Shasta-Trinity National Forest access pages, North Coast salmonid context, and weather data support the page. Confidence is moderated by remote-road conditions, landslide and storm risk, broad canyon access, and low-flow closures.
Regulations
CDFW low-flow and steelhead-card sources provide a strong legal-check path for South Fork Trinity salmonid planning.
Access
Shasta-Trinity National Forest sources support named river and fishing access, with road, bridge, and current-condition checks still required.
Flow and weather
RiverReports, USGS 11528700, and the National Weather Service point are attached to the route.
Fishing usefulness
The page now separates legal windows, high-water canyon risk, remote roads, storm color, pressure timing, and backup water choices.
Fishability dashboard and source review
2026-05-31 / material content or source review
RiverReports, USGS South Fork Trinity below Hyampom flow, CDFW low-flow and steelhead sources, North Coast salmon context, Shasta-Trinity National Forest South Fork Trinity access pages, and the National Weather Service point were checked before updating the current fishability guidance.
2026-05-31
Updated South Fork Trinity River with Hyampom trend guidance, low-flow-rule checks, remote forest access cards, backup cues, stable fishability SEO, and confidence signals.
2026-05-29
Added a page-specific report-confidence meter for South Fork Trinity flow, low-flow rules, forest access, remote-road safety, weather, and canyon trip-planning guidance.
2026-05-25
Published a new fishing report with flow, weather, hatch, fly, tactics, access, regulation, source, image-credit, and trip-planning sections.
Angler planning edge
Local details that change the plan
Best for
Legal coastal salmonid windows, Flow-timing trips, Anglers who check rules before driving
Wade or float
Wade from known legal access first. Float plans need current landings, safe flow, and local knowledge.
Best flows
Open under CDFW low-flow rules, dropping after rain, and clear enough to fish without stressing salmonids.
When to skip
Skip during closures, muddy storm spikes, hot low water, or private-access uncertainty.
Local plan
Hyampom, Hayfork, or Weaverville is the practical base. Check cdfw rules, usgs hyampom flow, shasta-trinity nf notices, and road conditions, then pick a short legal access plan instead of trying to cover the whole river.
Pressure
Pressure concentrates around open legal windows, easy bridges, hatchery or park access, and the first clearing days after storms.
Access nuance
Shasta-Trinity National Forest lists South Fork Trinity River access, including fishing access from South Fork Trinity River Bridge to Big Slide Campground.
Backup water
Check nearby BlueStreamFly reports if the gauge, rules, or weather do not fit the plan.
About the river
Setting, character, and why it fishes the way it does.
South Fork Trinity River is a large remote Trinity basin tributary where steelhead and salmonid habitat meet rugged forest access and quick storm changes.
These North Coast systems can fish well when open, cool, and clearing, but they are built around salmonid conservation, private-land edges, and fast-changing storms.
Shasta-Trinity National Forest lists South Fork Trinity River access, including fishing access from South Fork Trinity River Bridge to Big Slide Campground.
Target species
Steelhead
Potential legal-season target when open, cool, and fishable.
Chinook salmon
Important anadromous fish; current rules decide any legal opportunity.
Coho salmon
Conservation-sensitive; avoid targeting and protect spawning habitat.
Resident trout
Possible in tributary and upper-water context.
Reading the water
Stable winter flow
Best for swinging or drifting sparse flies through soft edges.
High canyon water
Unsafe from foot access and often too strong to fish well.
Clear low flow
Use smaller flies and avoid stressing visible fish.
Storm-damaged roads
Access can be the limiting factor even when flow looks fishable.
Best seasons
October to April
Main regulation-first window for coastal salmonid planning. Low-flow rules and storms matter more than the date.
Winter
Best for steelhead-style trips when the river is open, dropping, and clear enough to fish without stressing salmonids.
Spring
Useful for clearing-flow scouting, small hatches, and careful access checks after storms have settled.
Summer
Often a scouting or warmwater season. Avoid salmonid pressure when water is warm, low, or closed.
Preferred flow source
South Fork Trinity River below Hyampom
RiverReports is the preferred chart source when coverage exists. When a matching USGS gauge exists, keep it open as the official backstop for station data and current hydrograph context.
USGS data chart
Official USGS trend
Streamflow over the latest USGS reporting window.
Latest
332 cfs
Jun 3, 5 PM UTC
Weather
River weather report
Weather can change wading safety, road access, water temperature, hatches, and the best time of day to fish.
Live forecast loads as you reach this section
This keeps the report fast while still using the official National Weather Service forecast point.
Hatches and flies
Hatch chart and fly picks
Winter
Sparse midges, winter stones, eggs where legal, sculpins, and baitfish movement
Black stone, egg pattern where legal, soft hackle, black leech, sparse wet fly
Spring
BWOs, caddis, small mayflies, fry movement, and sculpins
BWO emerger, caddis pupa, soft hackle, sculpin, small clouser
Summer
Terrestrials, caddis, midges, warmwater forage, and estuary bait
Foam ant, small caddis, popper, baitfish streamer, crayfish
Fall
First rain pulses, small olives, caddis, and migration cues
Soft hackle, BWO, small streamer, muddler, sparse steelhead wet fly
Steelhead and salmonid flies
Sparse wet fly, black leech, egg pattern where legal, muddler, small intruder
Use only when the river is open, cool, and fishable.
Search streamers
Sculpin, clouser, olive bugger, black bugger, small baitfish
Use on clearing flows, deeper bends, shaded cutbanks, and soft edges.
Light-water flies
BWO emerger, caddis pupa, soft hackle, small nymph, foam ant
Use in low clear water or smaller legal side water when a lighter presentation fits.
Tactics
How to fish it
Check open status before leaving home, then match the gauge to clarity when you arrive.
Swing sparse flies or small streamers through soft traveling lanes only when the river is legal and fishable.
Avoid redds, staging fish, and crowded slots; these rivers depend on careful handling.
Keep a backup plan because coastal rivers can close or blow out quickly.
Rigging
Rod, leader, and setup notes
A 7- or 8-weight with floating and light sink-tip options covers legal winter salmonid work.
Carry sparse wet flies, leeches, small baitfish patterns, and barbless hooks.
Use short leaders when swinging sink tips and longer leaders in clear low water.
Bring rain gear, a wading staff, and a backup plan for closures or dirty water.
Access
Access and planning notes
Hyampom gauge corridor
Flow and road checkWade / float / trail
Gauge / road / canyon scout
When to pick it
Start here when the flow is steady or falling and road conditions are known.
Caution
Remote access can fail because of slides, storm damage, or long exits.
Shasta-Trinity National Forest access
Public access frameWade / float / trail
Forest road / bank / trail
When to pick it
Use it when Forest Service context, signs, and weather all support the chosen reach.
Caution
Public forest context does not remove road or private-inholding checks.
Canyon backup decision point
Go/no-go planningWade / float / trail
Road / weather / nearby river
When to pick it
Use this before driving deep into the canyon.
Caution
Cell service and emergency exits can be limited.
Shasta-Trinity National Forest lists South Fork Trinity River access, including fishing access from South Fork Trinity River Bridge to Big Slide Campground.
Confirm parking, land ownership, launch status, and current agency notices before relying on any access point.
Remote roads, landslides, cold water, high flows, and limited cell service
Regulations
Check before fishing
Check CDFW low-flow rules, current sport fishing regulations, and steelhead report-card requirements before fishing. Open status can change during the season.
Primary base
Hyampom, Hayfork, or Weaverville
Best day style
Remote forest road, bridge, and canyon access
Check first
CDFW rules, USGS Hyampom flow, Shasta-Trinity NF notices, and road conditions
Safety
Remote roads, landslides, cold water, high flows, and limited cell service
Gear
Helpful gear for this water
7- or 8-weight rod
Appropriate for legal winter steelhead water and bigger coastal flows.
Sink-tip option
Useful for deeper travel lanes and post-storm color.
Steelhead card
Required when fishing for steelhead in California anadromous waters.
Rain and safety kit
Coastal storms, cold water, and remote bars require conservative packing.
Nearby water
Other water to research
Backup logic
High water
Wait for the South Fork Trinity to drop or compare the main Trinity or Klamath after checking rules.
Heat
Avoid salmonid pressure in warm low water and target cooler legal windows.
Storms, slides, or stain
Treat road status and falling clarity as hard trip inputs.
Access issue
Use confirmed Forest Service access or choose a more accessible river.
Salmon River
Remote Klamath tributary flow and access planning.
Scott River
Scott Valley and Klamath National Forest planning.
Smith River
Clear North Coast rain-fed steelhead water.
FAQ
Fast answers
Is South Fork Trinity River fishable today?
South Fork Trinity River looks very fishable right now. The live score is 96/100, based on current flow, weather, public alerts, and the report's planning context. Recheck the linked gauge and forecast before leaving because conditions can change quickly after rain, heat, access changes, or flow swings.
What flow is best for South Fork Trinity River?
Open under CDFW low-flow rules, dropping after rain, and clear enough to fish without stressing salmonids.
When should I skip South Fork Trinity River?
Skip during closures, muddy storm spikes, hot low water, or private-access uncertainty.
Is South Fork Trinity River safe to wade right now?
The fishability score is not a wading guarantee. Wade only where your chosen access has safe edges, clear footing, legal entry, and no forced crossings; high, rising, stained, or storm-affected water should be treated conservatively.
Is South Fork Trinity River usually open for fly fishing?
Do not assume it is open. Low-flow rules, salmonid protections, and current sport-fishing regulations decide the legal plan.
Should I wade or float?
Wade from known legal access first. Float plans need current landings, safe flow, and local knowledge.
Which flow source should I use?
Use the RiverReports chart for a fast read and USGS 11528700 as the official flow source or context source.
Sources
Source set for this report
Reviewed 2026-05-31