Bighorn River Fishing Report: Trout Thrive in Cooler Mornings, Nymphs and Streamers Shine

Artificial Lure here with your September 10, 2025, fishing report for Big Horn, Montana. We’re heading into prime fall fishing with cool dawns and steady water. The **Bighorn River** is performing well as we ease into September. Local guides and anglers have reported solid action, especially in the morning when both **trout and anglers** are most active. Stay ready to see early risers making the best catches before sun climbs too high—yesterday’s sunrise was at 6:39 a.m., and today should be similar, with sunset rolling in around 7:38 p.m. Weather’s cooperative: expect **cooler mornings** in the mid-40s at dawn, climbing gently into the upper 60s by midday, no rain in the forecast, and variable clouds keeping things comfortable for a full session. With stable conditions like these, water temps are sitting right where fish like ‘em—making trout eager to chase and bite. Montana doesn’t run by ocean tides, so river flows and water temp changes drive fish activity. Given recent weeks’ reports, anglers have bagged healthy numbers of **rainbow trout** and **brown trout** in the Bighorn. Fish size reports are strong, with many trout between 14 and 18 inches—plenty of beef for a wild Montana river, and occasional bigger ones for those working harder or floating to less-pressured stretches. For gear and tactics, this week is about matching the hatch and working those cool hours. Anglers doing best are using **nymphs—especially sow bugs and scuds**—below indicators in shallower runs. The **black zebra midge**, **pale morning dun (PMD) emergers**, and small caddis patterns have also been hot tickets. Streamer fans should tie on olive or black **Woolly Buggers** and swing them deep before midday. For bait anglers, **earthworms** and locally-sourced nightcrawlers have grabbed some chunky browns near eddies and undercut banks, especially after first light. If you're tossing hardware, go with smaller rainbow-colored spoons or gold spinners right around sunrise for best results. Top spots for the day: - **Bighorn Access at Afterbay Dam**: Consistent results for both fly and bait anglers, easy to spend a morning hunting the seams. - **3 Mile Access**: Classic early fall spot, shaping up well in 2025 thanks to steady flows—look to the riffles and slower tailouts here, especially for larger brown trout. - For those drifting, **farther downstream near Bighorn Fishing Access Site** gets less pressure and lately has given up some of the week’s best rainbows, especially on smaller scud patterns. Fish counts have stayed high, with most locals reporting a dozen or more fish per outing when working the right windows—mostly **rainbows** but a handful of browns if you’re patient and keep switching up your flies. According to Fins & Feathers Guide Service, mid-June through mid-September is the peak, and we're catching the tail end of prime time right now. Remember, the best results are still coming from starting early, dressing for the brisk morning, and shifting to d This content was created in partnership and with the help of Artificial Intelligence AI.