Confirm the current BC freshwater fishing regulations (Region 4, Kootenay), including any bait, motor or ice-fishing limits for this lake, before you fish.
The water
St. Mary Lake lies Expansion of St. Mary River; in the St. Mary River watershed. It covers ~343 ha surface area. The lake survey puts it at max 21 m, mean 7.7 m, which sets the depth you fish.
The fishing
St. Mary Lake fishes on classic stillwater lines: chironomids over the shoals, leech and attractor retrieves along the drop-offs, and depth or troll work to the shoal-and-drop-off structure. Match the season and confirm against a local report.
Conditions
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Depth: max 21 m, mean 7.7 m (BC lake survey 1959-06-15).
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Water-health signal: excellent (health index 60), 9 species over 67 observations.
Access & the rules
Confirm the launch, parking and any motor/float or seasonal restrictions for St. Mary Lake locally before you commit a day; the map shows where the lake sits in its drainage.
Before you fish
Confirm the current BC freshwater fishing regulations (Region 4 – Kootenay) before you go. Official synopsis: gov.bc.ca fishing regulations.