Bow River Fly Fishing Report – Spring 2025Current Conditions and Trout ActivityThe Bow River fishing has remained strong transitioning from winter into early spring. Trout are healthy, energetic, and actively feeding after winter. Despite occasional cold snaps, fish are consistently biting even when temperatures hover near freezing. Notably, during a warm spell in February, rainbows aggressively pursued streamers. Late March continues to see steady trout feeding, particularly in warmer afternoon hours. Midge hatches have been hit or miss, potentially drawing trout to these small insects. On calmer afternoons, you might observe fish gently sipping midges off the surface, although subsurface nymph fishing remains much more productive. Trout generally hold in deeper, slower currents characteristic of winter, but they're increasingly venturing into shallower zones to feed. Many trout are found in depths under ten feet with gentle flows. On sunny days, it's not uncommon to spot fish visibly cruising shallow waters. Yet, deeper pools remain important, with trout actively feeding beneath the surface even when not visible from above. Some early spawning activity has been noted (a handful of rainbow redds), so anglers should be cautious not to disturb these sensitive areas. River Flow and ClarityFlows are currently below average for this time of year, with the river running about 30–40 cubic meters per second through Calgary. This is typical late-winter, pre-runoff flow. Water clarity remains very good, with conditions generally clear and cold. Downstream sections can experience slight turbidity from afternoon snowmelt, reducing visibility to about 2.5–3 feet on warmer days. With water temperatures just above freezing, trout are unlikely to move far for flies but will eagerly accept accurately presented offerings. Weather OverviewMarch has seen highly variable weather patterns. Following a mild February, winter returned with significant snowfall, beneficial for snowpack accumulation. The month alternated between cold, snowy days and occasional warm spells resembling spring. Chinook winds periodically boosted temperatures above 10°C, only to drop dramatically back to -10°C accompanied by snow shortly afterward. Anglers should prepare for rapidly changing conditions, ranging from sunny to windy or snowy. Positively, the overall trend is toward gradual warming, with increasing daylight and sun intensity. Prioritize fishing during mild days or stable weather windows. Sudden storms or cold fronts can temporarily reduce trout activity, although adaptable anglers will still find fish. Effective Flies and TechniquesNymphingCurrently, this method remains most effective. Choose small, dark nymphs imitating midge larvae or early-season mayflies, such as zebra midges (sizes 16–20, black/red) or small pheasant tails and BWO patterns (olive or black, sizes 16–18). Use an indicator rig to present flies naturally in deeper currents and seams, adding minimal split shot if needed. Watch carefully for subtle takes typical in cold water. StreamersWarmer weather windows offer excellent streamer opportunities for bigger trout. Use smaller, slower presentations compared to summer tactics. Leeches (sizes 4–8, black or olive) have been especially effective, along with small baitfish imitations like sparkle minnows or Kreelex minnows. Fish streamers with slow retrieves or by swinging through moderate currents. Sink-tip lines or lightly weighted flies help maintain the ideal depth. Streamers swung slowly in moderate flows have produced impressive trout. Dry FliesSurface action remains limited but possible during concentrated midge hatches in the afternoons. If trout rise, use small dry flies such as Griffith’s Gnats or midge clusters (sizes 18–20). For better visibility, pair these smaller patterns behind a more visible fly like a parachute Adams or small foam pattern. As April approaches, Blue-winged olives (BWOs, sizes 16–18) will begin hatching, particularly on cloudy days. Early Skwala stoneflies have also appeared sporadically—although not a major Bow River hatch, carrying a few Skwala patterns could be rewarding, particularly down low. Recommended Fishing Areas
Key Tips for Anglers
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