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Rating depth structure for rainbow trout.
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139-acre lake in Bulkley-Nechako Regional District, British Columbia. The lake tops out around 11 ft. Bathymetry on this water is estimated from its real outline and maximum depth. Use it to shortlist water, then verify with your electronics — and never navigate by it. The rest of this page walks each species through its year, using the map's own scoring.
Dia Lake maps at 139 acres behind 2 miles of shoreline. The basin is a simple one (shoreline index 1.2) — close to a bowl, so the structure on the chart matters more than the bank. There is no deep basin to speak of — the entire surface is under ~15 ft, prime weed water end to end. Figure 0.8 mi of water from one end to the other, 0.4 mi at the beam. It sits in Bulkley-Nechako Regional District. If the bite dies, Dukaihoonli Lake is 3 mi to the northwest.
Come spring, look for rainbow trout tight to the bank in 3 to 11 ft. Through summer count on 3 to 11 ft; the winter hold is 2 to 11 ft. Start at Break off the point. It's a drop-off holding about 5 ft of water and rates prime come winter. Prime time lands in early morning and the evening. A dodger + spoon (deep troll) or a flutter spoon is the honest summer answer here.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 11 ft | dawn & dusk | Main-lake point (8 ft) | Inline spinner (silver), Small spoon |
| Summer | 3 to 11 ft | dawn & dusk | Break off the point (5 ft) | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 3 to 11 ft | dawn & dusk | Main-lake point (8 ft) | Casting spoon, Jerkbait over shoals |
| Winter | 2 to 11 ft | dawn | Break off the point (5 ft) | Jigging spoon, Tube jig (white) |
6 pieces of structure are mapped here — Deep basin, around 9 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 Dia Lake specifically, so confirm the current rules before you fish.
Check the official British Columbia fishing regulations →
Dia Lake is about 11 ft (3 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.
Anglers target rainbow trout on Dia Lake.
Break off the point is the top-rated area: a drop-off in about 5 ft of water that rates prime for rainbow trout in winter. The interactive chart above rates every spot for each 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 Dia 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.
Dukaihoonli Lake 3 mi · Albert Lake 6 mi · Electra Lake 7 mi · Calais Lake 8 mi · Ahdatay Lake 10 mi · Wudtsi Lake 13 mi · Macdonald Lake 13 mi · Glaucers Lake 15 mi · Purvis Lake 15 mi · Tlutsacho Lake 16 mi · Airline Lake 18 mi · Takatoot Lake 18 mi
See how Dia Lake stacks up: best rainbow trout lakes in British Columbia
More water nearby: Bulkley-Nechako Regional District fishing maps (324 charts). Browse all British Columbia fishing maps or see every water on DepthScout. 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.