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Rating depth structure for rainbow trout.
Recent public catches load as you reach this section.
1,661-acre lake in Bulkley-Nechako Regional District, British Columbia. The lake tops out around 78 ft. Depth here is modeled from the true shoreline and max depth rather than surveyed; use it to plan, not to navigate. The rest of this page walks each species through its year, using the map's own scoring.
Grassham Lake maps at 1,661 acres behind 22.4 miles of shoreline — 5 islands included. A development index of 3.9 means a maze of bays and points: far more casting targets than a round bowl of the same size. Roughly 33% of the water is 15 ft or less as modeled, the band where the food chain lives. End to end it runs roughly 4.4 mi, about 1.5 mi across. Bulkley-Nechako Regional District claims this one. Shass Lake sits 2 mi northwest — the closest neighbouring chart.
The spring pattern is a shallow one: cutthroat trout in 3 to 15 ft. As the season builds they drop to 10 to 35 ft, wintering in 10 to 40 ft. Top water on the chart: Break off the point, a drop-off in the 35 ft range, prime in summer. Time it for early morning and the evening. Summer baits: a trolled spoon (small) or an inline spinner gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 15 ft | dawn & dusk | Main-lake point (20 ft) | Inline spinner (silver/gold), Small spoon |
| Summer | 10 to 35 ft | dawn & dusk | Break off the point (35 ft) | Trolled spoon (small), Inline spinner |
| Fall | 5 to 25 ft | dawn & dusk | Main-lake point (20 ft) | Casting spoon, Inline spinner |
| Winter | 10 to 40 ft | dawn | Break off the point (35 ft) | Small jigging spoon, Marabou jig |
When the water first warms, rainbow trout slide up into 5 to 20 ft. Summer is an 8 to 30 ft game here, winter an 8 to 40 ft one. Start at Break off the point. It's a drop-off holding about 35 ft of water and rates prime come winter. The feeding windows run early morning and the evening. Keep a dodger + spoon (deep troll) or a flutter spoon rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | Main-lake point (20 ft) | Inline spinner (silver), Small spoon |
| Summer | 8 to 30 ft | dawn & dusk | Main-lake point (20 ft) | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 10 to 35 ft | dawn & dusk | Main-lake point (20 ft) | Casting spoon, Jerkbait over shoals |
| Winter | 8 to 40 ft | dawn | Break off the point (35 ft) | Jigging spoon, Tube jig (white) |
Grassham Lake carries 6 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 66 ft down.
Access data: British Columbia Recreation Sites and Trails - Recreation Sites Subset. Confirm conditions and fees locally before you launch.
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 Grassham Lake specifically, so confirm the current rules before you fish.
Check the official British Columbia fishing regulations →
Grassham Lake is about 78 ft (24 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 cutthroat trout, rainbow trout on Grassham Lake.
Break off the point is the top-rated area: a drop-off in about 35 ft of water that rates prime for cutthroat trout in summer. Open the map above to see every rated spot for each species and season.
For cutthroat 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 Grassham 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.
Shass Lake 2 mi · Ogston Lake 2 mi · Camsell Lake 5 mi · Stuart Lake 5 mi · Tandat Lake 5 mi · Tseket Lake 5 mi · Tomas Lake 6 mi · Whitefish Lake 8 mi · Mcknab Lake 8 mi · Dawn Lake 9 mi · Karena Lake 10 mi · Nilan Lake 11 mi
See how Grassham Lake stacks up: best rainbow trout lakes in British Columbia · best cutthroat 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.