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Rating depth structure for brook trout.
Recent public catches load as you reach this section.
21-acre lake in Algoma District, Ontario. The lake tops out around 20 ft. The depth chart comes from Ontario Ministry of Natural Resources and Forestry bathymetric survey data, so the contours are survey-derived rather than computer-modeled. The depth data here comes from the Ontario MNRF survey of 1966, a decades-old survey (an MNRF lake survey). Every species below gets its seasonal read from the same numbers driving the chart.
On the chart, Franks Lake draws 21 acres inside 1.4 miles of shoreline. Index 2.1 on the shoreline: a few honest points and pockets, nothing labyrinthine. Call it 0.6 mi long by 0.2 mi wide at the broadest reach. You'll find it in Algoma District. Closest neighbour on DepthScout: Laurence Lake, 1 mi north of here.
Start shallow in spring: brook trout sit in 2 to 15 ft that time of year. Summer pushes them deeper, 6 to 20 ft, and winter fish settle into 3 to 20 ft. The spot to know is Deep basin, a deep basin in about 13 ft of water that rates prime for brook trout in summer. Warm-month bites cluster around early morning and the evening. Throw a small spoon fished deep or a trolled lake-clear wobbler + worm until the fish tell you otherwise.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Main-lake point (1 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 6 to 20 ft chart-limited; documented 10 to 30 ft | dawn & dusk | Deep basin (13 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Main-lake point (1 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Deep basin (13 ft) | Small jigging spoon, Tungsten jig + plastic |
When the water first warms, rock bass slide up into 2 to 10 ft. Summer is a 5 to 20 ft game here, winter a 6 to 20 ft one. Start at Deep basin. It's a deep basin holding about 13 ft of water and rates prime come winter. The feeding windows run the evening. Keep a ned rig (small) or a marabou jig rigged through the warm months.
Depth note: when a documented seasonal range extends below this chart, the table shows the deepest mapped working water, not a verified holding depth.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | midday & dawn | Main-lake point (1 ft) | 1/16 oz jig + grub, Small inline spinner |
| Summer | 5 to 20 ft | dusk | Main-lake point (1 ft) | Ned rig (small), Marabou jig |
| Fall | 6 to 20 ft chart-limited; documented 8 to 22 ft | midday | Break off the point (1 ft) | Small tube jig, Inline spinner |
| Winter | 6 to 20 ft chart-limited; documented 12 to 30 ft | midday | Deep basin (13 ft) | Tungsten jig + plastic, Small spoon + spike |
Count 5 structure marks on this chart. The deepest, Deep basin, sits near 13 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 Franks Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Franks Lake is about 20 ft (6 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1966, a decades-old survey (an MNRF lake survey).
Anglers target brook trout, rock bass on Franks Lake.
Deep basin is the top-rated area: a deep basin in about 13 ft of water that rates prime for rock bass in winter. Scroll up to the map for the complete spot list by species and season.
For brook 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 Franks Lake 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.
Laurence Lake 1 mi · Jones Lake 1 mi · Strawberry Lake 2 mi · Ranger Lake 3 mi · Trapper Lake 4 mi · Penelope Lake 4 mi · Saymo Lake 6 mi · Lelonde Lake 6 mi · McIlveen L. 20 7 mi · Mashagama Lake 7 mi · McIlveen L. 19 7 mi · Horseshoe Lake 8 mi
See how Franks Lake stacks up: best brook trout lakes in Ontario · best rock bass lakes in Ontario
More water nearby: Algoma District fishing maps (1026 charts). Browse all Ontario fishing maps. See every water on DepthScout. Bathymetry: published agency survey data. 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.