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Rating depth structure for rainbow trout.
Recent public catches load as you reach this section.
15-acre lake in British Columbia. The lake tops out around 36 ft. The depth chart comes from published agency bathymetric survey data, so the contours are survey-derived rather than computer-modeled. Below is the species-by-species picture, pulled from the same data the map uses.
The outline encloses 15 acres, worked by 0.6 miles of shoreline. A shoreline index of 1.2 says round and simple: fish relate to depth changes here, not shoreline features. About 96% of the surface sits shallower than 15 ft — that's the weed-and-bait zone. It sits in Capital Regional District. Butler Lake sits 1 mi east — the closest neighbouring chart.
When the water first warms, rainbow trout slide up into 5 to 20 ft. By summer they slide out to 8 to 30 ft, and by winter most fish are in 7 to 36 ft. If you only fish one area, make it Deep basin: a deep basin around 23 ft that scores prime in winter. In summer the feeding windows fall in early morning and the evening. Keep a dodger + spoon (deep troll) or a flutter spoon rigged through the warm months.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | Main-lake point (2 ft) | Inline spinner (silver), Small spoon |
| Summer | 8 to 30 ft | dawn & dusk | Deep basin (23 ft) | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 10 to 35 ft | dawn & dusk | Deep basin (23 ft) | Casting spoon, Jerkbait over shoals |
| Winter | 7 to 36 ft chart-limited; documented 8 to 40 ft | dawn | Deep basin (23 ft) | Jigging spoon, Tube jig (white) |
3 pieces of structure are mapped here — Deep basin, around 23 ft, is the deepest of them.
Season dates, license requirements, and size and bag limits for British Columbia waters are set by the BC freshwater fishing synopsis — and special regulations can apply to Boulder Lake specifically, so confirm the current rules before you fish.
Check the official British Columbia fishing regulations →
Boulder Lake is about 36 ft (11 m) deep at its deepest point. The depth chart comes from published agency bathymetric survey data, so the contours are survey-derived rather than computer-modeled.
Anglers target rainbow trout on Boulder Lake.
Deep basin is the top-rated area: a deep basin in about 23 ft of water that rates prime for rainbow trout in winter. Every other rated spot, per species and season, is on the map above.
For rainbow trout, the summer bite is best in early morning and the evening. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Fishing on Boulder Lake is regulated by the BC freshwater fishing synopsis. Check the official British Columbia regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Butler Lake 1 mi · Ranger Lake 1 mi · Tugwell Lake 2 mi · Forslund Lake 2 mi · Bear Creek Reservoir 3 mi · Macdonald Lake 5 mi · Boneyard Lake 6 mi · Weeks Lake 6 mi · Jarvis Lake 6 mi · Young Lake 7 mi · Sooke Lake 7 mi · Old Wolf Lake 7 mi
See how Boulder Lake stacks up: best rainbow trout lakes in British Columbia
More water nearby: Capital Regional District fishing maps (60 charts). Browse all British Columbia fishing maps. See every water on DepthScout. Bathymetry: published agency survey data. How we build these maps. Fish here with a sonar unit that logs? Send us your depth data and we'll improve this chart, credited to you. For fishing guidance only, never navigation.