Mackay Dam Tailwateron Big Lost River
Conditions right now
No USGS gauge is linked to this water yet, so we can't chart flows.
What's working on Big Lost River
- 01Blue-Winged Olives and Pale Morning Duns are actively hatching, providing dry fly opportunities on calmer days.
- 02Egg patterns are becoming increasingly important as trout key into spawning activity.
- 03Subsurface offerings like nymphs and streamers are highly effective as water temperatures drop.
- 04Midges remain a consistent food source and should be fished deep in slower runs.
What to tie on at Mackay Dam Tailwater
Picked from recent reports for this stretch.
Mother's Day Caddis
The prolific Mother's Day Caddis hatch is expected in late April through May, making this dry fly a perfect imitation for adult caddis and ideal for rising fish.
Zebra Midge (Black)
Midges are a primary active insect even in cold water, making this a staple year-round pattern. It's highly effective for enticing finicky Rainbow Trout, Dolly Varden, and Arctic Grayling.
Pheasant Tail Nymph
An essential mayfly nymph pattern, effective year-round and particularly important during spring BWO periods, mimicking various small mayfly nymphs.
Buy at AmazonSan Juan Worm
Effective year-round, especially after rainfall or runoff, which is common in spring. This pattern can attract opportunistic trout looking for dislodged aquatic worms.
Buy at AmazonBlue-Winged Olive Comparadun
Blue-Winged Olives are actively hatching in early spring, especially on overcast days, and this low-profile dry fly is excellent for selective trout feeding on emergers and adults.
Woolly Bugger (Olive)
A reliable year-round streamer, effective for imitating leeches and baitfish, especially in the colder spring flows of many Western rivers.
October Caddis (Dry)
Matches the October Caddis hatch, often the largest caddis hatch of the year in many western rivers during fall.
Buy at AmazonFlashback Hare's Ear Nymph
An excellent general searching nymph for early spring, mimicking various mayfly nymphs that are active year-round and particularly as BWOs begin to emerge.
Prince Nymph
A versatile attractor nymph effective year-round in various water types, imitating a variety of aquatic insects common in spring rivers.
Buy at AmazonIdaho season by season
What changes on the water through the year, with the flies for each season.
Fly shops nearby
Local flies, current advice and guided trips.