Bighorn River Fishing Report: Trout Bonanza as Temps Drop and Streamers Shine

Artificial Lure here, bringing you the October 19th fishing report for Big Horn, Montana. The Bighorn River is hitting prime fall stride right now. Flows are steady and water temps are optimal for trout activity, especially as colder nights tease that big migration and feeding push. Sunrise rolled in at 7:29 AM, with sunset expected around 6:26 PM. No tide to report up here—Montana rivers aren’t feeling the moon’s pull, just our classic Rocky Mountain push. Early this morning, low clouds crept in with a gentle northwest breeze, temperatures climbing from the upper 30s at dawn toward a crisp mid-50s by midday. Montana Outdoor notes that some swirling snow squalls hit last night, but as of this morning expect mostly overcast with patches of sun streaking in come noon. These conditions make for perfect streamer weather—fewer shadows overhead get the browns chasing bait hard. Recent catches on the Bighorn have been strong. Local guides report double-digit numbers of *rainbows* in the 13-16" class and *browns* averaging 15-18"—with several pushing over 20 inches landed this past week. The action's best from late morning through mid-afternoon, especially after the sun warms things up a tad. Best baits and lures right now: - **Nymphs:** Size 16-20, especially sowbugs, scuds and baetis. The fish are tuned to smaller profiles as the water cools. A number of nice trout came on gray and tan patterns. - **Streamers:** Olive or black Woolly Buggers, Mini Dungeons, and gold sparkle Leeches. Strip ‘em slow along the seams and inside corners—watch for browns moving out of deep riffles eager to pounce. - **Dry flies:** If you hit a warm pocket, try blue-wing olive emergers in size 18. A light hatch popped up near Afterbay last evening. Live bait isn’t permitted on most Bighorn stretches, so stick with top-tier Montana flies and lures. A little extra flash in your presentation can make all the difference as the river stains up after last week’s rain. Local old-timers swear by switching from olive to black just before dusk. Hot spots to target: - **Afterbay Access:** The tailwater stretch right below the dam is reliable for steady rainbow action. Drift your nymph rigs tight to the drop-off. Fish are holding deep but move into shallows late in the day. - **Three Mile Access:** For browns, work the gravel bars and mid-channel seams. The deepest slot just above the bridge has produced some chunky fish this week. - If you like exploring, the *Spreadeagle* bend offers less pressure—a couple of patient anglers pulled out trophy browns on articulated streamers at first light yesterday. Bear activity around Tom Miner Basin is spiking, according to Cowboy State Daily, with grizzlies foraging high country roots. Bighorn River anglers don’t see many, but if you’re wading near brush at dawn or dust, stay alert and pack your bear spray. It’s October in Montana: you share the water with wild neighbors. To sum it up—get out now while flows are stable, water temps hover nea This content was created in partnership and with the help of Artificial Intelligence AI.