Flathead Lake doesn't have one central base — it has several small towns spread around the shoreline, and which one makes sense depends on what you're doing. Polson sits at the lake's south end, where the Flathead River leaves the lake and runs down through Kerr Dam; it's the natural gateway to the whitewater and float-trip water downstream.
Bigfork sits at the opposite end, at the mouth of the Swan River on the northeast shore, and works better as a base for Jewel Basin hiking and the Highway 35 side of the lake. Somers, on the north shore near where Highway 93 meets the lake, is smaller and quieter than either, with its own public beach and boat launch.
All three connect by the two highways that ring the lake — 93 on the west shore, 35 on the east — so a multi-day trip often uses more than one as a base rather than picking just one.
Lodging and restaurant options are more concentrated in Bigfork and Polson than in Somers, which functions more as a quiet launch point than a full-service base. Worth knowing before you plan around any one town: the southern half of the lake, including Polson, sits within the Flathead Indian Reservation, which matters for fishing licenses even if it doesn't affect where you can stay or eat.
