Southeast of Columbia Falls, the South Fork of the Flathead River is known as one of the best rivers in the Rockies for wild cutthroats. The river starts near the center of the Bob Marshall Wilderness Area. To fish the upper reaches of the South Fork of the Flathead River, youll need to hike or horseback your way in for several days. Over 40 miles of the South Fork flow through the wilderness area. A good starting point is the south end of the Hungry Horse Reservoir where many trails continue south. While this river is a waders paradise, there are some outfitters that will port in rafts. From near Danaher Creek, almost the entire South Fork can be floated, especially the first 40 miles.
To reach the trailhead from Hungry Horse on US 2, head south on FS895, near the ranger station, across the damn. Continue south for 55 miles to the Spotted Bear Ranger Station parking area. Start riding further down the road to pick up the trail on the right just past the corral.
Keep an eye out for moose, elk, wolves and brown bear.
Note: there are special fishing regulations on the South Fork in the Wilderness Area. Make sure to check on the latest specs. It had been that only fish under 12 inches may be taken and they had to be either cutthroats, rainbows or graylings.
Overall, South Fork Flathead River is the 1st most popular fly fishing river of all 21 fly fishing spots in Montana.