For an angler weighing whether Hiawatha is worth a stop, the release record is the honest answer: it was a long-running put-grow fishery, but the taps have been off since 2007. Provincial hatchery records log 43 releases between 1931 and 2007, totalling roughly 138,000 fish.
Rainbow trout carried most of the program (38 releases, about 84,000 fish across a long list of strains including Fraser Valley, Pennask, Tunkwa, Premier and Gerrard Creek stock), while
westslope cutthroat trout and cutthroat/rainbow crosses made up the rest, around 54,000 fish across 5 releases. The earliest record on file is a 1931 planting of cutthroat fry sourced from the Cranbrook water reservoir.
The last plant, on October 31, 2007, put 350 Fraser Valley-strain fall catchable rainbow trout into the lake. Nothing has followed it. Any fish holding in Hiawatha today are residual survivors of that program or their offspring, not a fresh annual cohort, so treat the lake as a small wild-leaning fishery rather than a put-and-take stop.