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Rating depth structure for brook trout.
Recent public catches load as you reach this section.
93-acre lake in Thunder Bay District, Ontario. The lake tops out around 13 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 1980 (an MNRF lake survey). What follows comes from the same scoring engine that paints the spots above.
Traced from the shoreline, Crosman Lake runs 93 acres with 4 miles of edge. The 2.9 development index tells the story — a convoluted bank whose fishable edge far outruns the acreage. There is no deep basin to speak of — the entire surface is under ~15 ft, prime weed water end to end. Tip to tip the water measures near 1.3 mi with a 0.4-mi widest point. The water lies in Thunder Bay District. The nearest mapped water is Bluff Lake, 1 mi to the southwest.
The spring pattern is a shallow one: brook trout in 2 to 13 ft. The depth story barely changes: 4 to 13 ft through summer, 2 to 13 ft in winter. The spot to know is Deep basin, a deep basin in about 10 ft of water that rates prime for brook trout in summer. Plan around early morning and the evening in the warm months. Summer baits: a small spoon fished deep or a trolled lake-clear wobbler + worm gets it done.
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 13 ft chart-limited; documented 2 to 15 ft | dawn & dusk | Main-lake point (1 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 4 to 13 ft chart-limited; documented 10 to 30 ft | dawn & dusk | Deep basin (10 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 13 ft chart-limited; documented 2 to 15 ft | midday & dawn | Main-lake point (1 ft) | Small spoon (orange), Spinner |
| Winter | 2 to 13 ft chart-limited; documented 3 to 20 ft | dawn | Deep basin (10 ft) | Small jigging spoon, Tungsten jig + plastic |
6 pieces of structure are mapped here — Deep basin, around 10 ft, is the deepest of them.
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 Crosman Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Crosman Lake is about 13 ft (4 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1980 (an MNRF lake survey).
Anglers target brook trout on Crosman Lake.
Deep basin is the top-rated area: a deep basin in about 10 ft of water that rates prime for brook trout in summer. Every other rated spot, per species and season, is on the map above.
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 Crosman 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.
Bluff Lake 1 mi · Deep Lake 2 mi · Big Duck Lake 3 mi · Ducell Lake 6 mi · Davidson Lake 6 mi · Found Lake 7 mi · Ambrose Lake 7 mi · Craig Lake 7 mi · Chapman Lake 9 mi · Bews Lake 11 mi · Antler Lake 11 mi · Flicker Lake 11 mi
See how Crosman Lake stacks up: best brook trout lakes in Ontario
More water nearby: Thunder Bay District fishing maps (662 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.