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Rivers Hatches About

Callibaetis

Mayfly

Callibaetis · Callibaetis nigritus

Active on 1 of 1 section today

Where & When

Madison 1 section

Upper Madison Peak 58.1°F

Jul–Aug · #14-16

Real-time river conditions for Montana fly anglers.

Flow data from USGS. Weather from Open-Meteo. Access sites from Montana FWP.

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Data is provisional and subject to revision. Always check local conditions before fishing. © 2026 Montana Hatch