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Unless you're dead set on only hitting one lake, you could make a "tour" out of it. Head over by Great Falls and have the ability to hit a few lakes all within an hour or so drive from town? Frances, Pishkun, Bynum, Tiber, Nelson are all relatively close to Great Falls.
PECK!
Thinking about taking a road trip doing some ice fishing unfortunately I'll be fishing alone so not sure how far I want to go might just stick around the Kalispell area maybe head down to Cascade Lake would like to hit Fort Peck if I could find others to go with or even Cascade