A small alpine lake at the top of Kootenay Pass, west of Creston: no stocking record, just a resident mix of westslope cutthroat, bull trout (Dolly Varden) and brook trout, a backcountry campsite on the shore, and a cool-water fallback when the valley rivers and lower lakes warm up.

Boundary Lake has no water-specific listing, so the Region 4 regional defaults apply: trout/char daily 5, no more than 1 rainbow or cutthroat over 50 cm, and no more than 1 bull trout of any size. Confirm the current rules in the Region 4 synopsis before you fish.

Boundary Lake sits at the top of Kootenay Pass, on Highway 3 west of Creston, one of a scatter of small backcountry stillwaters in the pass country along with Woodenshoe Lake farther south. No release ever shows up in the provincial stocking record for Boundary Lake, which points to a wild, self-sustaining population rather than a put-and-take fishery: westslope cutthroat, bull trout (locally called Dolly Varden) and brook trout all hold here, likely spawning in the small tributary creeks that feed the lake.

Fish Boundary Lake the way you'd fish any small alpine stillwater: work the shoreline and any drop-off with small-lake tactics, and keep flies and leaders on the light side for lake-bound cutthroat and brookies. It earns its keep in mid-summer, when the valley's low-elevation rivers and lakes have warmed past their best; the elevation at the pass keeps the water cool long after the Goat River and other Creston-area waters have gone soft. Chironomids under an indicator and a general match-the-hatch approach through the evening rise are a reasonable starting point until a local report says otherwise.

The lake has its own Recreation Sites and Trails BC campground on the shore, reached from the Kootenay Pass summit area of Highway 3 west of Creston. The exact access road and trailhead have not been confirmed here, so check current conditions with Recreation Sites and Trails BC or a local shop before you make the drive.