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146-acre lake near McAdam Parish. Government of New Brunswick lake depth survey. The lake tops out around 12 ft. The contours are modeled from the water's real shoreline and maximum depth. Treat them as a rough guide, and never use them for navigation. Every species below gets its seasonal read from the same numbers driving the chart.
Thompsons Lake maps at 146 acres behind 3.2 miles of shoreline. With a 1.9 development index there's bank structure worth casting at, in moderation. All of it is shallow-zone water — under ~15 ft across the entire basin, so the food chain has the run of the place. The basin spans about 0.9 mi end to end and 0.4 mi across at its widest. York County claims this one. Its nearest charted neighbour, Modsley Lake, is 2 mi to the south.
Come spring, look for smallmouth bass tight to the bank in 3 to 12 ft. Expect a summer slide to 4 to 12.1 ft, then a winter hold in 4 to 12.1 ft. Start at Main-lake point. It's a point holding about 8 ft of water and rates prime come fall. Prime time lands in early morning and the evening. A drop shot (goby/minnow) or a ned rig is the honest summer answer here.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | dawn & dusk | Main-lake point (8 ft) | Ned rig, Tube jig |
| Summer | 4 to 12.1 ft | dawn & dusk | Break off the point (5 ft) | Drop shot (goby/minnow), Ned rig |
| Fall | 4 to 12.1 ft | midday & dawn | Main-lake point (8 ft) | Jerkbait, Blade bait |
| Winter | 4 to 12.1 ft | midday | Break off the point (5 ft) | Blade bait, Hair jig |
The spring pattern is a shallow one: chain pickerel in 2 to 10 ft. As the season builds they drop to 2 to 12.1 ft, wintering in 3 to 12.1 ft. Top water on the chart: Shallow bay flat, a weed flat in the 3 ft range, prime in spring. Time it for early morning and the evening. Summer baits: a weedless spoon + trailer or a buzzbait gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | midday & dawn | Shallow bay flat (3 ft) | Inline spinner (silver), Small spoon (red/white) |
| Summer | 2 to 12.1 ft | dawn & dusk | Shallow bay flat (3 ft) | Weedless spoon + trailer, Buzzbait |
| Fall | 3 to 12.1 ft | midday & dawn | Shallow bay flat (3 ft) | Jerkbait along weed edges, Spinnerbait |
| Winter | 3 to 12.1 ft | dawn | Shallow bay flat (3 ft) | Jigging spoon (through ice) |
Start shallow in spring: yellow perch sit in 3 to 12 ft that time of year. Summer pushes them deeper, 4 to 12.1 ft, and winter fish settle into 4 to 12.1 ft. The spot to know is Shallow bay flat, a weed flat in about 3 ft of water that rates prime for yellow perch in spring. Warm-month bites cluster around early morning. Throw a drop-shot micro plastics or a small spoon tipped with worm until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | Shallow bay flat (3 ft) | Small jig + curly tail, Perch-pattern micro crank |
| Summer | 4 to 12.1 ft | dawn | Deep basin (10 ft) | Drop-shot micro plastics, Small spoon tipped with worm |
| Fall | 4 to 12.1 ft | midday | Deep basin (10 ft) | Jigging spoon (small), Perch rig / spreader |
| Winter | 4 to 12.1 ft | midday & dawn | Deep basin (10 ft) | Tungsten jig + spikes, Rattle spoon (small) |
Spring brook trout on Thompsons Lake hold shallow, usually 2 to 12.1 ft. Depth-wise the year is flat: 4 to 12.1 ft in summer, 2 to 12.1 ft once it turns cold. Put Deep basin first on the milk run — a deep basin near 10 ft that grades prime for summer. The feeding windows run early morning and the evening. The summer box starts with a small spoon fished deep or a trolled lake-clear wobbler + worm.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 12.1 ft | dawn & dusk | Main-lake point (8 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 4 to 12.1 ft | dawn & dusk | Deep basin (10 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 12.1 ft | midday & dawn | Main-lake point (8 ft) | Small spoon (orange), Spinner |
| Winter | 2 to 12.1 ft | dawn | Deep basin (10 ft) | Small jigging spoon, Tungsten jig + plastic |
Thompsons Lake carries 6 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 10 ft down.
Season dates, license requirements, and size and bag limits for New Brunswick waters are set by the New Brunswick fishing rules — and special regulations can apply to Thompsons Lake specifically, so confirm the current rules before you fish.
Check the official New Brunswick fishing regulations →
Thompsons Lake is about 12.1 ft (4 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 smallmouth bass, chain pickerel, yellow perch, brook trout on Thompsons Lake. This isn't a survey of the water — none is published for it — but an informed estimate from the species common to the region, narrowed by this water's depth, size and each species' range.
Main-lake point is the top-rated area: a point in about 8 ft of water that rates prime for smallmouth bass in fall. Scroll up to the map for the complete spot list by species and season.
For smallmouth bass, 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 Thompsons Lake is regulated by the New Brunswick fishing rules. Check the official New Brunswick regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Modsley Lake 2 mi · Wauklahegan Lake 3 mi · First Lake 4 mi · Fifth Lake 5 mi · Palfrey Lake 5 mi · Sixth Lake 6 mi · Magaguadavic Lake 9 mi · Spednic Lake 10 mi, NB/ME · La Coote Lake 11 mi · Lambert Lake 12 mi, ME · Little Magaguadavic Lake 12 mi · Amelia Lake 13 mi
See how Thompsons Lake stacks up: best smallmouth bass lakes in New Brunswick · best yellow perch lakes in New Brunswick · best brook trout lakes in New Brunswick · best chain pickerel lakes in New Brunswick
More water nearby: York County fishing maps (30 charts). Browse all New Brunswick 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.