Three Main branches, the North Fork, Middle Fork and South Fork eventually come together to form the main stem of the Flathead River that flows into the 28-mile long Flathead Lake. Access to the three forks and the main Flathead is readily available in places, but to effectively fish the best of the Flathead, floating is suggested. The hardest part about fly fishing this part of northwestern Montana is keeping your eye on your fly and not the spectacular scenery.