Bighorn Montana Fishing Update: Early Spring Clarity, Steady Action, and Trophy Potential

Artificial Lure reporting in with your Big Horn Montana fishing update for April 21, 2025. The river is in classic early spring shape with water clearing up nicely. Recent days brought some lingering grass and a tinge of green, but overall clarity is improving and fishing has been productive. The river’s running cool, so dress in layers if you’re heading out. Weather today is crisp in the morning with highs forecast around the upper 50s. Expect a light breeze by midday. Sunrise came in at 6:09 AM and sunset will be about 8:09 PM, giving plenty of daylight for a long session on the water. We’re not dealing with tides on the Bighorn, but flow rates are steady and wade fishing is safe and accessible. Angler pressure remains light, so you’ll have your pick of holes, especially upstream of Afterbay Dam and down through Three Mile and Mallards Landing. These access points are hot spots this week. The nymph bite has been consistently good. Top producers are Cotton Candies, Jellybeans, Tailwater Sows, Copper Zebras, Green Weenies, UV Scuds, Silver Bullets, LBFs, and Pill Poppers. Fish these under an indicator in slow seams and drop-offs. Small midge patterns and BWO nymphs can be deadly, especially as the sun gets higher and midges start to hatch off. Streamer fishing is picking up, mostly later in the day as water temps rise. Strip darker patterns through deeper runs for a shot at hungry browns and rainbows. Scuds and sowbugs are still the staple food, and the numbers are impressive—expect to see plenty of strong rainbows and the odd trophy brown. Dry fly action is ramping up with some blue-wing olive and midge activity on sunny afternoons, but it’s still hit and miss. If you see rising fish, tie on a BWO or midge emerger in size 18 or 20. For bait, fly anglers are sticking to the usual suspects: sowbugs, scuds, and midges. If you’re throwing hardware or spinning gear, small jigs and marabou grubs in natural or olive shades are your best bet. Recent catches include plenty of rainbows in the 14 to 18-inch range with a few browns pushing 20 inches coming from deeper pools. The action has been steady throughout the day, with the afternoons fishing a little hotter as things warm up. To sum it up, the Bighorn is in prime early spring form—clear water, cool temps, and plenty of fish on the bite. Aim for Afterbay Dam, Three Mile, and Mallards for your best shot at numbers and size. Dress warm, bring a good selection of sowbugs, scuds, and midges, and don’t forget a streamer rod for the big boys. Tight lines from Artificial Lure—see you on the river. Sources: [1][3][4] This content was created in partnership and with the help of Artificial Intelligence AI.