Gallatin River Fishing Report

Updated 03/25/2026

Current Flow: ~ 557 CFS @ Gallatin Gateway

The Gallatin River has been fishing well and is firmly starting to transition into early spring mode. Warmer weather has settled in across the region, with daytime highs pushing into the 60s and even low 70s this week. The biggest variable lately has been wind—pretty typical for March—so it’s worth planning around it and focusing on more protected sections of river when possible. Overall, conditions are trending in the right direction and should continue to improve as the week goes on.

Nymphing continues to be the most consistent way to find fish. Double nymph rigs with a rubberlegs or girdle bug paired behind with a smaller mayfly nymph or flashy attractor have been producing steady results. Fish are starting to feed a bit more aggressively with the warmer temps, and getting your flies down in the right zone has been key. Adjust depth and weight often to stay in contact with the bottom.

Streamer fishing is also gaining momentum. As water temps slowly rise, fish are becoming more willing to chase. Smaller sculpin and baitfish patterns like Sculpzillas have been productive, especially when fished through deeper runs, undercut banks, and slower edges. Mixing in a few streamer passes throughout the day has been worth the effort.

Dry fly action has been somewhat weather dependent, but it is improving. On calmer afternoons—especially with cloud cover—we’re seeing more consistent midge activity and the first real signs of Blue Wing Olives. These windows have been short but productive if you time them right. As the days continue to warm, expect those dry fly opportunities to become more consistent.

Fish are still favoring classic early spring water in the mornings—slower seams, softer edges, and deeper runs—but are starting to move more as the day warms. We’re seeing fish slide into riffles, drop-offs, and feeding lanes more consistently during the afternoon hours.

Looking ahead, this warm stretch should continue to push things forward. Expect increased bug activity, more consistent feeding windows, and overall improving fishing day by day. One thing to keep an eye on is low-elevation snowmelt starting to creep in during the afternoons, which can add a slight tint to the water. Clarity has still been good overall, but targeting those clearer morning windows or stable flow days will give you the best shot at consistent fishing.

Recommended Flies:
Nymphs: Perdigon #16–18, Splitback BWO #18 Zebra Midge #18–20, Rainbow Warrior #18, Jig Naploen #16-18, Frenchie #18, Soft Hackle PT #16–18, Eggs #12, Pat’s Rubberlegs #10–14, Jigged Rubberlegs #12–14
Streamers: Mini Sculpin, Thin Mint, Sculpzilla, Small Sparkle Minnow, Wooly Bugger
Dries: Griffith’s Gnat #18–20, Brooks Sprout Midge #18–20, Extended Body BWO #18

Learn More about the Gallatin in our Complete Gallatin River Fishing Guide - Hatches, Flies, Best times to fish, and Best places to fish