The Missouri River should produce well as temperatures rise into the mid-forties. Still might be a bit gusty but that shouldn't have too much effect on the fishing. It's mostly a subsurface game at the moment with scuds, sowbugs, and midges being the go to strategy. Dead drifting a crayfish would be a good idea or swinging soft hackles would be a great alternative to nymphing.
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The Missouri River is formed with the confluence of the Jefferson, Madison, and Gallatin rivers near Three Forks, Montana. The blue-ribbon stretches of the river are generally considered downstream in the “tail-water” sections, which are formed below several reservoirs. The best trout fishing section of the Missouri River is the stretch of river downstream from Holter Lake that our guides fish in the spring and early summer. Closer to Bozeman is the stretch of the Missouri River around Toston Reservoir which is a great mid-summer Carp destination that also holds a few large trout seasonally.