Formed by the confluence of the Gallatin, Jefferson, and Madison in the town of Three Forks, the Missouri River flows for 700 miles across Montana.  The stretch of the Missouri that we trout fish is between Holter Dam and Cascade, about 35 miles.  Many consider this stretch of river to be the best trout fishing in the world.  The dam creates consistent flows, as well as cold, clean water.  This in turn gives life to an incredible trout fishery.  Aquatic insects thrive in these waters and range from Scuds and Sow bugs to Midges, Mayflies, Caddis, and even a few Stoneflies.  All this food feeds all those trout.  Rainbows and Browns flourish, averaging between 14-17 inches, with plenty in the 18+ inch class.  These fish aren't just big, they are strong.  Be careful or they will eat your lunch!  The Missouri River rewards and challenges anglers of all skill levels.  Nymphing and streamer fishing are productive, but the "MO" is notorious for it's dry fly fishing.  Casting to rising trout is what gets people border line obsessed with the Missouri, whether they are throwing a size 20 Trico or a size 8 grasshopper.