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Fishing Big Onion Lake: what the data says
149-acre lake near British Columbia. The lake tops out around 36 ft. The contours are modeled from the water's real shoreline and maximum depth. Treat them as a rough guide, and never use them for navigation. What follows comes from the same scoring engine that paints the spots above.
Rainbow Trout fishing at Big Onion Lake
Start shallow in spring: rainbow trout sit in 5 to 20 ft that time of year. Summer pushes them deeper, 8 to 30 ft, and winter fish settle into 7 to 36 ft. The spot to know is Main-lake point, a point in about 9 ft of water that rates prime for rainbow trout in spring. In summer the feeding windows fall in early morning and the evening. A dodger + spoon (deep troll) or a flutter spoon covers the summer program.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | Inline spinner (silver), Small spoon |
| Summer | 8 to 30 ft | dawn & dusk | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 10 to 35 ft | dawn & dusk | Casting spoon, Jerkbait over shoals |
| Winter | 7 to 36 ft | dawn | Jigging spoon, Tube jig (white) |
Notable structure
- Deep basin: deep basin, around 31 ft
- Main-lake point: point, around 9 ft
- Secondary point: point, around 9 ft
- Shallow bay flat: weed flat, around 4 ft
- Back-bay flat: weed flat, around 4 ft
Common questions
How deep is Big Onion Lake?
Big Onion Lake is about 36 ft (11 m) deep at its deepest point. The contours here are modeled from the water's real shape and maximum depth, so treat them as a rough guide.
What fish are in Big Onion Lake?
Anglers target rainbow trout on Big Onion Lake.
Where is the best fishing spot on Big Onion Lake?
Main-lake point is the top-rated area: a point in about 9 ft of water that rates prime for rainbow trout in spring. Open the map above to see every rated spot for each species and season.
When is the best time to fish Big Onion Lake?
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.
Nearby waters
Fish Lake · Lastman Lake · Big Lake · Fishem Lake · Vedan Lake · Elkin Lake
See how Big Onion Lake stacks up: best rainbow trout lakes in British Columbia
Browse all British Columbia fishing maps or every water on DepthScout. How we build these maps. For fishing guidance only, never navigation.