Gallatin River Guides is Big Sky ' s year - round fishing - only shop and outfitter serving the Gallatin , the Madison , and Yellowstone National Park . We fish a ton . Period . Fishing is what we do - not skiing , not biking , not backpacking . We do one thing and we do it well . From beginner to expert , from the Madison to the spring creeks , GRG is your source for fly fishing in Big Sky .
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