Sowerby Lake is not individually listed in the Region 4 synopsis, so the general provincial and Region 4 (Kootenay) daily-quota and bait rules apply. Confirm the current synopsis before you fish.

Sowerby covers 6.4 hectares, sitting southeast of the much larger Wasa Lake in the East Kootenay. Its waterbody identifier ties it to the St. Mary River drainage, though no bathymetry survey is on record, so depth, structure and clarity are unconfirmed. What is on record is the fish: rainbow trout only, stocked continuously since 1951, with no other species ever released here.

A 6.4-hectare put-grow lake fishes small: work the shoals and any drop-off you can find with a chironomid under an indicator early in the season, when the chironomid and bloodworm patterns that carry most small East Kootenay stillwaters are the standard opener. As the water warms, switch to a stripped leech or a balanced leech along any structure, and try an adams or another general attractor dry for an evening rise. No lake-specific fishing report is on file for Sowerby, so treat this as the standard small-lake stillwater playbook and confirm against a current local report before you go.

No boat launch or access route is on file for Sowerby; confirm the road in locally before you commit a day, using Wasa Lake to the northwest as the nearest landmark.

Sowerby is carried entirely by its rainbow trout program: 83 recorded releases since 1951, totalling roughly 205,000 fish. Volumes have fallen from the 3,000-yearling years of the 1980s and 1990s to today's steadier, smaller program: 500 Pennask-strain yearlings released via the Beaver hatchery every spring for eight straight years, 2019 through 2026. The full year-by-year release history, coloured by strain, is below.