Big Lost River

Outlook · Jul 29–Aug 5

This outlook’s window has closed. It is kept as a record of what was forecast at the time.

Big Lost River

Current conditions for Big Lost River · Map, access and gauges

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Flow

No flow

Observed

81d ago

Conditions

The Big Lost is shaping up well for the outlook window. The North Fork is clearing and the main stem holds fish; the East Fork draws heavy pressure, so plan to move water and seek unpressured lies. Flows remain slightly elevated but manageable for confident waders. Morning hatches of Tricos and PMDs fade by afternoon, but crane flies persist through the day. Bring an assortment of attractor patterns in both large and small sizes, plus nymphs and streamers to cover your options.

Gauges

Live cameras

Big Lost River below Inlet Diversion near Arco

USGS 13132520 · Oct 18, 2026, 5:00 PM

Every 60 min · daylight

Big Lost River near Arco

USGS 13132500 · Oct 18, 2026, 5:00 PM

Every 60 min · daylight

Big Lost River near Leslie

USGS 13130300 · Oct 18, 2026, 5:00 PM

Every 60 min · 247

Big Lost River bl Mackay Res nr Mackay

Last updated

USGS 13127000 · Nov 7, 2025, 10:00 AM

Every 60 min · 247

Recommended flies

Attractor dry fliesPMDs size 16Yellow SalliesCrane FliesGolden StonesBaetis 18,20Midge 20-24StreamersNymphs

Access

East Fork sees heavy pressure; North Fork clearing and main stem holding fish well.

Safety

Flows manageable for confident waders; read your ability before committing to the water.