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Shared by DepthScout anglers. Exact spots stay private, always.
117-acre lake in Renfrew County, Ontario. The lake tops out around 29 ft. Bathymetry on this water is estimated from its real outline and maximum depth. Use it to shortlist water, then verify with your electronics — and never navigate by it. The rest of this page walks each species through its year, using the map's own scoring.
The outline encloses 119 acres, worked by 3.5 miles of shoreline. With a shoreline index of 2.3, this water is all arms and coves — edge habitat well beyond its acreage. 76% of the surface is littoral (under ~15 ft), per the model — cover, weeds and forage water. The basin spans about 0.7 mi end to end and 0.5 mi across at its widest. It sits in Renfrew County. If the bite dies, Little Johns Lake is 2 mi to the east.
Come spring, look for brook trout tight to the bank in 2 to 15 ft. Expect a summer slide to 9 to 29 ft, then a winter hold in 3 to 20 ft. Start at Deep basin. It's a deep basin holding about 25 ft of water and rates prime come summer. Prime time lands in early morning and the evening. A small spoon fished deep or a trolled lake-clear wobbler + worm is the honest summer answer here.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Main-lake point (8 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 9 to 29 ft | dawn & dusk | Deep basin (25 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Main-lake point (8 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Break off the point (13 ft) | Small jigging spoon, Tungsten jig + plastic |
Early season brown bullhead use the shallows, holding in 2 to 8 ft. Expect a summer slide to 3 to 12 ft, then a winter hold in 10 to 25 ft. Put Deep basin first on the milk run — a deep basin near 25 ft that grades prime for winter. In summer the feeding windows fall in after dark and the evening.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | dusk & night | Shallow bay flat (3 ft) | |
| Summer | 3 to 12 ft | night & dusk | Shallow bay flat (3 ft) | |
| Fall | 5 to 15 ft | dusk | Shallow bay flat (3 ft) | |
| Winter | 10 to 25 ft | midday | Deep basin (25 ft) |
Count 6 structure marks on this chart. The deepest, Deep basin, sits near 25 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 Jonsons Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Jonsons Lake is about 29 ft (9 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 brook trout, brown bullhead on Jonsons Lake.
Deep basin is the top-rated area: a deep basin in about 25 ft of water that rates prime for brown bullhead in winter. Open the map above to see every rated spot for each 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 Jonsons 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.
Little Johns Lake 2 mi · Lower Long Lake 2 mi · Kelly Lake 3 mi · Rattrays Lake 3 mi · Middle Long Lake 4 mi · Crooked Lake 4 mi · Petznick Lake 5 mi · Golden Lake 6 mi · Perrigo Lake 6 mi · Upper Long Lake 7 mi · Brewster Lake 8 mi · Colby Lake 8 mi
See how Jonsons Lake stacks up: best brook trout lakes in Ontario · best brown bullhead lakes in Ontario
More water nearby: Renfrew County fishing maps (298 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.