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Crowsnest River

Southern Alberta · 10 active this month

Crowsnest River Hatch Calendar

Last reviewed 2026-05-21

Tailwater below Crowsnest Lake dam. Pteronarcys californica documented (Townsend & Pritchard 1998).

August hatches

No photo available

Pale Morning Dun

Ephemerella inermis

Air 14–28°C (optimal 16–26°C)Water 12–18°C (optimal 13–17°C)

Tailwater below Crowsnest Lake dam. Pteronarcys californica documented (Townsend & Pritchard 1998).

No photo available

Yellow Sally

Isoperla spp.

Air 16–32°CWater 12–20°C

Tailwater below Crowsnest Lake dam. Pteronarcys californica documented (Townsend & Pritchard 1998).

No photo available

Green Sedge

Rhyacophila spp.

Air 14–28°CWater 10–18°C

Tailwater below Crowsnest Lake dam. Pteronarcys californica documented (Townsend & Pritchard 1998).

Flying Ant

Flying Ant

Formicidae

Air 15–35°C (optimal 20–30°C)Water 10–22°C

Tailwater below Crowsnest Lake dam. Pteronarcys californica documented (Townsend & Pritchard 1998).

No photo available

Beetle

Coleoptera

Air 15–35°C (optimal 20–30°C)Water 10–22°C

Tailwater below Crowsnest Lake dam. Pteronarcys californica documented (Townsend & Pritchard 1998).

Midge

Midge

Chironomidae

Air -5–25°C (optimal 5–18°C)Water 2–20°C (optimal 4–15°C)

Tailwater below Crowsnest Lake dam. Pteronarcys californica documented (Townsend & Pritchard 1998).

No photo available

Spotted Sedge

Hydropsyche spp.

Air 16–30°CWater 12–20°C

Tailwater below Crowsnest Lake dam. Pteronarcys californica documented (Townsend & Pritchard 1998).

No photo available

Trico

Tricorythodes spp.

Air 16–30°C (optimal 18–28°C)Water 14–22°C (optimal 15–21°C)

Tailwater below Crowsnest Lake dam. Pteronarcys californica documented (Townsend & Pritchard 1998).

No photo available

Sow Bug

Asellus

Air 10–28°CWater 8–22°C

Tailwater below Crowsnest Lake dam. Pteronarcys californica documented (Townsend & Pritchard 1998).

Grasshopper

Grasshopper

Acrididae

Air 15–35°C (optimal 20–30°C)Water 10–22°C

Tailwater below Crowsnest Lake dam. Pteronarcys californica documented (Townsend & Pritchard 1998).

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