12pm(now) — Western Blue-Winged Olive
Peak activity at 11am — Western Blue-Winged Olive (Western Blue-Winged Olive, Peak emergence window)
Hatch predictions
Top nymph shown — see all 2 guilds as a supporter.
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Hatch predictions
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Based on species-occurrence records, not local invertebrate surveys.
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
The Jefferson is born where the Beaverhead, Ruby, and Big Hole all come together, and it grows into a big, slow, brushy valley river that hides some genuinely large brown trout under its banks. It's a spring-and-fall proposition. Come summer it draws down, warms up, and goes under hoot-owl restrictions as quick as anything in the region — so fish the cool mornings and the shoulders of the year, and leave the hot afternoons to somebody who hasn't read the gauge.
EPA ATTAINS assessment unit 'Jefferson River' (MT41G001_011), 2021 Integrated Report. Aquatic Life use: Not Supporting. Listed impairment causes: Temperature, Sediment, Habitat Alterations, Hydrologic Alteration, Metals Other Than Mercury. This is a Clean Water Act assessment-unit classification (the US analogue of WFD), not a live reading.
Status is for the Clean Water Act assessment unit covering this reach.
EPA ATTAINS (Clean Water Act) · MT41G001_011
The Jefferson is born where the Beaverhead, Ruby, and Big Hole all come together, and it grows into a big, slow, brushy valley river that hides some genuinely large brown trout under its banks.
12pm(now) — Western Blue-Winged Olive
Peak activity at 11am — Western Blue-Winged Olive (Western Blue-Winged Olive, Peak emergence window)
Hatch predictions
Top nymph shown — see all 2 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Hatch predictions
Supporters see what else is on the menu.
Start free trial14-day free trial. Cancel anytime.
Based on species-occurrence records, not local invertebrate surveys.
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
The Jefferson is born where the Beaverhead, Ruby, and Big Hole all come together, and it grows into a big, slow, brushy valley river that hides some genuinely large brown trout under its banks. It's a spring-and-fall proposition. Come summer it draws down, warms up, and goes under hoot-owl restrictions as quick as anything in the region — so fish the cool mornings and the shoulders of the year, and leave the hot afternoons to somebody who hasn't read the gauge.
EPA ATTAINS assessment unit 'Jefferson River' (MT41G001_011), 2021 Integrated Report. Aquatic Life use: Not Supporting. Listed impairment causes: Temperature, Sediment, Habitat Alterations, Hydrologic Alteration, Metals Other Than Mercury. This is a Clean Water Act assessment-unit classification (the US analogue of WFD), not a live reading.
Status is for the Clean Water Act assessment unit covering this reach.
EPA ATTAINS (Clean Water Act) · MT41G001_011
Mayflies
Chironomids
Gammarids
