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Rating depth structure for rock bass.
Shared by DepthScout anglers. Exact spots stay private, always.
41-acre lake in Algoma District, Ontario. The lake tops out around 98 ft. This chart interpolates between a real shoreline and a known maximum depth. It will point you at likely water, but it is not a navigation product. Here is how the season plays out for each species, straight from the data behind the map.
The drawn water covers 41 acres wrapped in 1.3 miles of bank. With a 1.5 development index there's bank structure worth casting at, in moderation. 14% of the surface is littoral (under ~15 ft), per the model — cover, weeds and forage water. Tip to tip the water measures near 0.4 mi with a 0.4-mi widest point. Algoma District claims this one. If the bite dies, Adelaide Lake is 1 mi to the north.
Start shallow in spring: rock bass sit in 2 to 10 ft that time of year. Warm water sends them out to 5 to 20 ft; cold water stacks them in 12 to 30 ft. Top water on the chart: Main-lake point, a point in the 25 ft range, good in fall. Fish it in the evening and you'll meet the bite. Throw a ned rig (small) or a marabou jig until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | midday & dawn | open water | 1/16 oz jig + grub, Small inline spinner |
| Summer | 5 to 20 ft | dusk | Main-lake point (25 ft) | Ned rig (small), Marabou jig |
| Fall | 8 to 22 ft | midday | Main-lake point (25 ft) | Small tube jig, Inline spinner |
| Winter | 12 to 30 ft | midday | Deep basin (83 ft) | Tungsten jig + plastic, Small spoon + spike |
Count 5 structure marks on this chart. The deepest, Deep basin, sits near 83 ft.
Season dates, license requirements, and size and bag limits for Ontario waters are set by the Ontario fishing regulations (FMZ summary) — and special regulations can apply to Olsen L. 27 specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Olsen L. 27 is about 98 ft (30 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 rock bass on Olsen L. 27.
Main-lake point is the top-rated area: a point in about 25 ft of water that rates good for rock bass in fall. The map above holds the full rated-spot list for every species and season.
For rock bass, the summer bite is best in 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 Olsen L. 27 is regulated by the Ontario fishing regulations (FMZ summary). Check the official Ontario regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Adelaide Lake 1 mi · Bone Lake 1 mi · Drew Lake 2 mi · McGovern Lake 3 mi · Batchawana Lake 4 mi · Wishart Lake 4 mi · Olsen L. 13 4 mi · Dick Lake 5 mi · Tilley Lakes 5 mi · Little Turkey Lake 5 mi · McCollough Lake 5 mi · Griffin Lake 5 mi
See how Olsen L. 27 stacks up: best rock bass lakes in Ontario
More water nearby: Algoma District fishing maps (1026 charts). Browse all Ontario 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.