What flies are hatching on the Henry's Fork right now?

Current and seasonal hatches on the Henry's Fork include Pale Morning Dun, Trico, Green Drake. Use the AI Hatch Advisor on this page for a live, temperature-aware recommendation.

What's the current flow on the Henry's Fork?

The Henry's Fork is running at 276 CFS at the Near Island Park gauge. Readings update every 15 minutes from the USGS Water Services API.

Is the Henry's Fork fishable today?

Henry's Fork is rated marginal right now. Flow is 276 CFS at the Near Island Park gauge. Go in prepared — heavier tippet, cautious wading, or target edges and seams.

Island Park

Henry's Fork

Marginal276 CFSAdvanced

Live Conditions

Henry's Fork — Near Island Park

Marginal

276CFS

Discharge

2.56ft

Gauge Height

—

Water Temp

Updated 1 hr agoView on USGS ↗

7-Day Flow

→ Stable

RisingFallingStable

24-Hr Pressure

23.82 inHg · → High/stable

Falling (good)RisingHigh/stable

Local Weather

41°FClear sky

Wind 15 mph23.82 inHg Low & stable

Tough conditions — fish deep

Today

🌤️

Partly cloudy

62° / 34°

Tomorrow

☁️

Overcast

52° / 32°

Wed

☁️

Overcast

58° / 30°

Thu

☁️

Overcast

63° / 35°

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?

One call. Specific to today's exact conditions on the Henry's Fork.

What should I pack?

Rod, flies, tippet, and safety gear specific to today's Henry's Fork conditions.

🪰 Hatch Calendar

Henry's Fork · May · Late Spring

Full calendar →

Showing typical dates — water temperature data unavailable for live hatch predictions.

Select month

JanDec

BWOs continue (size 18-20). Caddis (size 14-16) starting. Salmonfly possible in lower river late month. Flows still manageable thanks to spring inputs and reservoir regulation.

Blue-Winged OliveCaddis

River Map

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

About Henry's Fork

World-famous spring-fed river through the Island Park caldera. Iconic Pale Morning Dun, Trico, Green Drake, and Callibaetis hatches over selective rainbows and brown trout — Harriman Ranch is fly-only catch-and-release.

Pale Morning DunTricoGreen DrakeCallibaetisMidgeBlue-Winged Olive

Regulations

Harriman Ranch (Last Chance to Pinehaven / Osborne Bridge) is fly-fishing only and catch-and-release year-round. Other stretches have variable seasons and tackle rules — check current IDFG regulations before you go.