All Hatch Charts
Raven River
Central Alberta · 4 active this month
Raven River Hatch Calendar
Last reviewed 2026-05-21
Spring creek — technical midge, BWO, trico, and scud fishing; minimal stonefly diversity.
May hatches
Midge
Chironomidae
Highmedium
#18-263-12 mm
Air -5–25°C (optimal 5–18°C)Water 2–20°C (optimal 4–15°C)
Spring creek — technical midge, BWO, trico, and scud fishing; minimal stonefly diversity.
Blue-winged Olive
Baetis spp.
Highmedium
#18-225-7 mm
Air 8–18°C (optimal 10–16°C)Water 5–12°C (optimal 6–11°C)
Spring creek — technical midge, BWO, trico, and scud fishing; minimal stonefly diversity.
No photo available
Sow Bug
Asellus
Highmedium
#16-206-10 mm
Air 10–28°CWater 8–22°C
Spring creek — technical midge, BWO, trico, and scud fishing; minimal stonefly diversity.
No photo available
Scud
Gammarus
Highmedium
#14-188-14 mm
Air 10–28°CWater 8–22°C
Spring creek — technical midge, BWO, trico, and scud fishing; minimal stonefly diversity.