Blackfoot River Fishing Report 5/18/26
It's dropping! It's Dropping! The Blackfoot is on a consistent drop from it's peak of 7,000 CFS on friday. It's down to 4,600 as of this morning and the graph shows it continuing to drop! Someone tell the river it's May and it's got needs to hold water for 6 more months, or else it's gonne be a bad summer.
The clarity is improving too which is awesome for fishing. However, the water temp has dropped from almost Salmon Fly water to not so Salmon Fly water. But that's ok! As long as the Blackfoot can stay cold and full of water I'll be happy! The tributaries are also open! So if the Blackfoot isn't fishing well maybe check out onw of the many tribs up 200!
Dry fly action remains somewhat limited due to the colder water temps, but opportunities are gradually increasing. On warmer afternoons, anglers may find March Browns, BWO’s, and the Caddis flying around, with sporadic hatch activity showing up later in the day. The caddis are just starting so check those guys in the evenings. I personally haven't see too many fish looking up but that doesn't mean they aren't. While there may be bugs, the fish on the blackfoot are still looking for a squirmy worm and a big stonefly nymph. The Blackfoot typically lags behind other area rivers in warming, so consistent topwater action may still be a bit early—but the trend is improving as conditions stabilize.
Nymphing continues to be the most productive method. Heavier setups are still necessary to get flies down in the faster currents, and both indicator and tightline techniques are effective when dialed in. Stonefly nymphs, worms, and smaller mayfly patterns like Pheasant Tails and perdigons are all producing. Focus on softer holding water—inside seams, tailouts, and deeper runs—where fish are conserving energy. As always, while flows and clarity is still dropping into the perfect late spring fishery, you cannot go wrong with a turd and a worm.
Streamer fishing has remained solid and should only improve as clarity continues to get better. The slightly off-colored water still favors larger, high-contrast patterns, fished slow and deep along structure and banks. Sculpin patterns, Woolly Buggers, and darker streamers are producing, though as visibility improves, expect lighter colors like white and gold to become more effective. The upper river is currently offering the best overall conditions, but with flows dropping and clarity improving daily, the entire system is shaping up nicely heading into a strong spring window.