What flies are hatching on the Trinity River right now?

Current and seasonal hatches on the Trinity River include Blue-Winged Olive. Use the AI Hatch Advisor on this page for a live, temperature-aware recommendation.

What's the current flow on the Trinity River?

The Trinity River is running at 310 CFS at the Trinity River at Lewiston gauge. Readings update every 15 minutes from the USGS Water Services API.

Is the Trinity River fishable today?

Yes — Trinity River is rated fishable right now. Current flow is 310 CFS at the Trinity River at Lewiston gauge.

Trinity River Fly Fishing Conditions

Live Conditions

Trinity River — Trinity River at Lewiston

Fishable

310CFS

Discharge

13.80ft

Gauge Height

49.1°F

Water Temp

Updated 11 min agoView on USGS ↗

7-Day Flow

→ Stable

RisingFallingStable

24-Hr Pressure

27.63 inHg · → High/stable

Falling (good)RisingHigh/stable

Local Weather

41°FClear sky

Wind 2 mph27.63 inHg Low & stable

Tough conditions — fish deep

Today

☁️

Overcast

83° / 34°

Tomorrow

☁️

Overcast

78° / 40°

Mon

☁️

Overcast

66° / 45°

Tue

☁️

Overcast

71° / 44°

Cold front incoming — go deep with nymphs, surface activity likely slow.

Weather by Open-Meteo · No API key · Updated every 30 min

What should I fish today?

⚡ AI

AI-powered recommendation using today's live flow, temperature, and hatch data.

8.6

Time of Day

Using: 310 CFS · 49.1°F · OCTOBER CADDIS

What should I pack?

Rod, flies, tippet, and safety gear specific to today's Trinity River conditions.

🪰 Hatch Calendar

Trinity River · October · Fall

Full calendar →

🟢 Active now at 49.1°F water

Blue-Winged Olive

Select month

JanDec

OCTOBER CADDIS (size 8). FALL STEELHEAD beginning to enter — swung flies and skated dries. BWOs strong.

Blue-Winged OliveCaddis

🟢 Active · 🟡 Approaching · ⚪ Seasonal only

River Map

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USGS Gauge (click for site ID)Fishing Access / SectionScroll to zoom disabled — use map controls

About Trinity River

The Trinity River below Lewiston Dam is California's top steelhead tailwater, with consistent cool flows supporting runs of both winter and summer steelhead. The Lewiston tailwater section holds wild rainbow trout year-round, while steelhead push up from the Klamath from October through April. The Hoopa Valley Tribe co-manages the fishery.

SalmonflyGolden StonePale Morning DunCaddisBlue-Winged OliveOctober Caddis

Regulations

All wild steelhead (intact adipose fin) must be released statewide. Hatchery steelhead (clipped adipose fin) may be kept — check current CDFW regulations for bag limits. California Steelhead Report Card required ($10.29) when fishing for steelhead. California Sport Fishing License required.

Learn More

Guides to help you fish Trinity River with more confidence.