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Rating depth structure for rainbow trout.
Recent public catches load as you reach this section.
864-acre lake in Fraser-Fort George Regional District, British Columbia. The lake tops out around 118 ft. The depth chart comes from published agency bathymetric survey data, so the contours are survey-derived rather than computer-modeled. Species by species, here's what the data says the year looks like.
Drawn out, this is 864 acres of water rimmed by 8.6 miles of bank, with 4 islands in the mix. The shoreline is moderately structured (index 2.1) — enough points and pockets to pattern. The shallow band under 15 ft claims about 31% of the surface — that's where the groceries are. Call it 2.1 mi long by 1.4 mi wide at the broadest reach. You'll find it in Fraser-Fort George Regional District. The nearest mapped water is Hourston Lake, 2 mi to the northeast.
Spring puts rainbow trout in skinny water — 5 to 20 ft is the zone. As the season builds they drop to 8 to 30 ft, wintering in 8 to 40 ft. Spring rainbow trout concentrate at Main-lake point, a good-rated point around 1 ft. Warm-month bites cluster around early morning and the evening. A dodger + spoon (deep troll) or a flutter spoon covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | Main-lake point (1 ft) | Inline spinner (silver), Small spoon |
| Summer | 8 to 30 ft | dawn & dusk | Shallow feeding flat (26 ft) | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 10 to 35 ft | dawn & dusk | Main-lake point (1 ft) | Casting spoon, Jerkbait over shoals |
| Winter | 8 to 40 ft | dawn | Break off the point (60 ft) | Jigging spoon, Tube jig (white) |
Structure-wise the chart holds 8 features, led in depth by Deep basin at roughly 109 ft.
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 Firth Lake specifically, so confirm the current rules before you fish.
Check the official British Columbia fishing regulations →
Firth Lake is about 118 ft (36 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 Firth Lake.
Main-lake point is the top-rated area: a point in about 1 ft of water that rates good for rainbow trout in spring. The map above holds the full rated-spot list for every species and season.
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 Firth 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.
Hourston Lake 2 mi · Goose Lake 8 mi · Hambone Lake 8 mi · Toodick Lake 8 mi · Chudnuslida Lake 9 mi · Destilida Lake 10 mi · Mcleod Lake 10 mi · Chuyazega Lake 11 mi · Tacheeda Lakes 12 mi · Fern Lakes 12 mi · Fern Lakes 13 mi · Fishhook Lake 14 mi
See how Firth Lake stacks up: best rainbow trout lakes in British Columbia
More water nearby: Fraser-Fort George Regional District fishing maps (188 charts). Browse all British Columbia fishing maps or 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.