Although Flathead Lake is typically known for its size and beauty, it also offers some excellent fishing opportunities.
While there are some cutthroats available, the lake is primarily a mackinaw or lake trout fishery. These fish are great quarry. They are big, strong, nice to look at, and delicious.
Flathead Lake is not a fly fisherman’s paradise, but just a few miles in any direction and you’ll be in trout territory again. The lake itself is best targeted with spinning gear and a motorized boat is a big help when trying to find some macks. Flathead is very, very deep — hundreds of feet in places. That’s why jigging is the preferred method.
A few Flathead Lake fishing regulations:
Cutthroat trout — catch and release
Lake whitefish — 100 daily and in possession
Lake trout — 100 daily and in possession.
Size — there is a slot limit enforced whereas only one fish over 36 inches, and all fish between 30 and 36 inches must not be retained.
Permits — a Salish Kootenai Tribal permit is required to fish on the southern half of the lake.