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Bighorn Montana Fishing Report: Late Summer Trout Action on the Fly
Published 8 months, 3 weeks ago
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This is Artificial Lure coming to you with your Big Horn Montana fishing report for Wednesday, August 6, 2025. If you’re anywhere near Fort Smith or drifting down near Hardin, you’re in for some classic late-summer action on the Bighorn and surrounding waters.
Let’s start with the conditions. The river’s running cool and clear, with no recent flood warnings, and the weather is picture perfect for anglers: tonight, mostly clear skies, temps in the mid-50s, and a gentle east wind around 10 mph—ideal for both evening wading and early morning starts. Tomorrow brings highs in the upper 70s, partly cloudy skies, and those lovely southwest breezes that keep the bugs and the fish lively. Sunrise was at 5:55 this morning and sunset will be right around 8:34 tonight, giving you plenty of light to chase that last big brown.
Speaking of browns, as posted just today by the folks at Big Horn Valley Ranch, August heralds the uptick in brown trout aggression. “Big browns are getting more aggressive, bugs are thriving”—so if you’re a streamer fan, this is your window. Anglers have been pulling in healthy browns up to the 20-inch mark, especially early and late when the light is low and water’s cool. Rainbows are in the mix as well, especially in the upper three miles below Afterbay Dam, where the population is healthy and fish are running 14 to 18 inches. Reports from local guides over recent days point to several fish per rod, with browns outnumbering bows two to one in the evenings.
On the bug front—PMDs and Black Caddis are thick in the air, with a touch of Trico mayflies downriver on calmer mornings. The best action is coming on dry flies, PMD sparkle duns in size 16-18, and classic Black Caddis patterns in the 18-20 range. During the heat of day when the surface slows, switch to nymphs—Ray Charles (tan or pink), sow bugs, and small split-case PMDs have been top producers. If the water gets riffled or cloudy with wind, slap on a streamer and don’t be shy—olive or white sculpins, especially weighted, have been moving the biggest fish recently. The streamer bite is picking up, particularly around heavier structure and drop-offs.
Bait soakers: the Bighorn is fly-only in the prime stretches, but up in a few of the lakes like Bighorn Lake itself, nightcrawlers and cut bait (legal spots only, check those regs) are tempting some solid walleye and catfish in the evenings. Word is, a few 5-pounders were pulled out of Horseshoe Bend just this past weekend.
Two hot spots to check: Afterbay access down to Three Mile is seeing the best brown trout activity, especially on caddis just before dark. For more elbow room and a shot at some big rainbows, swing by Bighorn Access or drift through “13 Mile”—lots of water, plenty of deep runs, and fish on the feed.
Please keep boat safety in mind—there was a recent accident near Mallards Access, and river currents are always stronger than they look. If you’re wading, shuffle and watch those seams.
That wraps the bite for today. The weather’s sweet, the bugs are hatching, and the trout are on. Thanks for tuning in, and don’t forget to subscribe for your next fishing fix. This has been a quiet please production, for more check out quiet please dot ai.
Great deals on fishing gear https://amzn.to/44gt1Pn
This content was created in partnership and with the help of Artificial Intelligence AI
This episode includes AI-generated content.
Let’s start with the conditions. The river’s running cool and clear, with no recent flood warnings, and the weather is picture perfect for anglers: tonight, mostly clear skies, temps in the mid-50s, and a gentle east wind around 10 mph—ideal for both evening wading and early morning starts. Tomorrow brings highs in the upper 70s, partly cloudy skies, and those lovely southwest breezes that keep the bugs and the fish lively. Sunrise was at 5:55 this morning and sunset will be right around 8:34 tonight, giving you plenty of light to chase that last big brown.
Speaking of browns, as posted just today by the folks at Big Horn Valley Ranch, August heralds the uptick in brown trout aggression. “Big browns are getting more aggressive, bugs are thriving”—so if you’re a streamer fan, this is your window. Anglers have been pulling in healthy browns up to the 20-inch mark, especially early and late when the light is low and water’s cool. Rainbows are in the mix as well, especially in the upper three miles below Afterbay Dam, where the population is healthy and fish are running 14 to 18 inches. Reports from local guides over recent days point to several fish per rod, with browns outnumbering bows two to one in the evenings.
On the bug front—PMDs and Black Caddis are thick in the air, with a touch of Trico mayflies downriver on calmer mornings. The best action is coming on dry flies, PMD sparkle duns in size 16-18, and classic Black Caddis patterns in the 18-20 range. During the heat of day when the surface slows, switch to nymphs—Ray Charles (tan or pink), sow bugs, and small split-case PMDs have been top producers. If the water gets riffled or cloudy with wind, slap on a streamer and don’t be shy—olive or white sculpins, especially weighted, have been moving the biggest fish recently. The streamer bite is picking up, particularly around heavier structure and drop-offs.
Bait soakers: the Bighorn is fly-only in the prime stretches, but up in a few of the lakes like Bighorn Lake itself, nightcrawlers and cut bait (legal spots only, check those regs) are tempting some solid walleye and catfish in the evenings. Word is, a few 5-pounders were pulled out of Horseshoe Bend just this past weekend.
Two hot spots to check: Afterbay access down to Three Mile is seeing the best brown trout activity, especially on caddis just before dark. For more elbow room and a shot at some big rainbows, swing by Bighorn Access or drift through “13 Mile”—lots of water, plenty of deep runs, and fish on the feed.
Please keep boat safety in mind—there was a recent accident near Mallards Access, and river currents are always stronger than they look. If you’re wading, shuffle and watch those seams.
That wraps the bite for today. The weather’s sweet, the bugs are hatching, and the trout are on. Thanks for tuning in, and don’t forget to subscribe for your next fishing fix. This has been a quiet please production, for more check out quiet please dot ai.
Great deals on fishing gear https://amzn.to/44gt1Pn
This content was created in partnership and with the help of Artificial Intelligence AI
This episode includes AI-generated content.