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Rating depth structure for rainbow trout.
Recent public catches load as you reach this section.
495-acre lake in Nanaimo Regional District, British Columbia. The lake tops out around 144 ft. Depth here is modeled from the true shoreline and max depth rather than surveyed; use it to plan, not to navigate. Here is how the season plays out for each species, straight from the data behind the map.
The outline encloses 495 acres, worked by 5.5 miles of shoreline. A middling shoreline index (1.8) gives it some bays to work without being a maze. The shallow band under 15 ft claims about 16% of the surface on the model — that's where the groceries are. The basin spans about 2.4 mi end to end and 0.6 mi across at its widest. Nanaimo Regional District claims this one. If the bite dies, Third Lake is 5 mi to the east.
Start shallow in spring: cutthroat trout sit in 3 to 15 ft that time of year. Summer pushes them deeper, 10 to 35 ft, and winter fish settle into 10 to 40 ft. The spot to know is Main-lake point, a point in about 36 ft of water that rates prime for cutthroat trout in summer. Warm-month bites cluster around early morning and the evening. Throw a trolled spoon (small) or an inline spinner until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 15 ft | dawn & dusk | open water | Inline spinner (silver/gold), Small spoon |
| Summer | 10 to 35 ft | dawn & dusk | Main-lake point (36 ft) | Trolled spoon (small), Inline spinner |
| Fall | 5 to 25 ft | dawn & dusk | Main-lake point (36 ft) | Casting spoon, Inline spinner |
| Winter | 10 to 40 ft | dawn | Main-lake point (36 ft) | Small jigging spoon, Marabou jig |
When the water first warms, kokanee slide up into 10 to 30 ft. Summer is a 30 to 70 ft game here, winter a 20 to 80 ft one. Start at Break off the point. It's a drop-off holding about 65 ft of water and rates prime come summer. The feeding windows run early morning. Keep a dodger + pink/orange squid on downrigger or a kokanee bug + corn rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 10 to 30 ft | dawn | Deep basin (122 ft) | Small dodger + squid (pink), Wedding-ring spinner + corn |
| Summer | 30 to 70 ft | dawn | Break off the point (65 ft) | Dodger + pink/orange squid on downrigger, Kokanee bug + corn |
| Fall | 5 to 40 ft | dawn | open water | Dodger + squid (deeper red/purple), Small spoon |
| Winter | 20 to 80 ft | dawn | Break off the point (65 ft) | Small glow jig + corn or maggot, Tiny spoon |
Come spring, look for rainbow trout tight to the bank in 5 to 20 ft. They move out to 8 to 30 ft in summer and finish the year down in 8 to 40 ft. If you only fish one area, make it Main-lake point: a point around 36 ft that scores prime in fall. Best bite is 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 | 5 to 20 ft | dawn & dusk | Shallow bay flat (6 ft) | Inline spinner (silver), Small spoon |
| Summer | 8 to 30 ft | dawn & dusk | Shallow bay flat (6 ft) | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 10 to 35 ft | dawn & dusk | Main-lake point (36 ft) | Casting spoon, Jerkbait over shoals |
| Winter | 8 to 40 ft | dawn | Break off the point (65 ft) | Jigging spoon, Tube jig (white) |
Count 6 structure marks on this chart. The deepest, Deep basin, sits near 122 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 Fourth Lake specifically, so confirm the current rules before you fish.
Check the official British Columbia fishing regulations →
Fourth Lake is about 144 ft (44 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, kokanee, rainbow trout on Fourth Lake.
Main-lake point is the top-rated area: a point in about 36 ft of water that rates prime for cutthroat trout in summer. Scroll up to the map for the complete spot list by 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 Fourth 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.
Third Lake 5 mi · Shelton Lake 6 mi · Healy Lake 7 mi · Kissinger Lake 10 mi · Rhododendron Lake 11 mi · Kammat Lake 11 mi · Tuck Lake 11 mi · Henry Lake 12 mi · Nanaimo Lakes 12 mi · Blackjack Lake 13 mi · Sherk Lake 13 mi · Cottle Lake 14 mi
See how Fourth Lake stacks up: best rainbow trout lakes in British Columbia · best kokanee lakes in British Columbia · best cutthroat trout lakes in British Columbia
More water nearby: Nanaimo Regional District fishing maps (33 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.