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29-acre lake near Grant County. The lake tops out around 25 ft. The depth chart comes from published agency bathymetric survey data, so the contours are survey-derived rather than computer-modeled. Here's the year, species by species, as the scoring engine sees it.
Drawn out, this is 29 acres of water rimmed by 0.8 miles of bank. The basin is a simple one (shoreline index 1.1) — close to a bowl, so the structure on the chart matters more than the bank. Littoral water — the productive band under ~15 ft — makes up 55% of this chart. Call it 0.3 mi long by 0.2 mi wide at the broadest reach. The water lies in Grant County. Closest neighbour on DepthScout: Deep Lake, 20 mi southwest of here.
In spring, rainbow trout run shallow here, mostly 5 to 20 ft. Midsummer fish sit out in 7 to 25 ft before dropping to 5 to 25 ft for winter. Winter rainbow trout concentrate at Break off the point, a prime-rated drop-off around 18 ft. Fish it in early morning and the evening and you'll meet the bite. You won't need more than a dodger + spoon (deep troll) or a flutter spoon most summer days.
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 | 5 to 20 ft | dawn & dusk | Main-lake point (5 ft) | Inline spinner (silver), Small spoon |
| Summer | 7 to 25 ft chart-limited; documented 8 to 30 ft | dawn & dusk | Break off the point (18 ft) | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 7 to 25 ft chart-limited; documented 10 to 35 ft | dawn & dusk | Secondary point (6 ft) | Casting spoon, Jerkbait over shoals |
| Winter | 5 to 25 ft chart-limited; documented 8 to 40 ft | dawn | Break off the point (18 ft) | Jigging spoon, Tube jig (white) |
The chart marks 5 structure features on Thompson Lake; the deepest is Deep basin at about 25 ft.
Season dates, license requirements, and size and bag limits for Washington waters are set by the Washington Department of Fish and Wildlife — and special regulations can apply to Thompson Lake specifically, so confirm the current rules before you fish.
Check the official Washington fishing regulations →
Thompson Lake is about 25 ft (8 m) deep at its deepest point. The depth chart comes from published agency bathymetric survey data, so the contours are survey-derived rather than computer-modeled.
Anglers target rainbow trout on Thompson Lake.
Break off the point is the top-rated area: a drop-off in about 18 ft of water that rates prime for rainbow trout in winter. Scroll up to the map for the complete spot list by species and season.
For rainbow 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 Thompson Lake is regulated by the Washington Department of Fish and Wildlife. Check the official Washington regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Deep Lake 20 mi · Park Lake 22 mi · Grimes Lake 23 mi · French Johns Lake 23 mi · Blue Lake 25 mi · Jameson Lake 25 mi · Alkali Lake 28 mi · Soap Lake 35 mi · Alta Lake 39 mi · Crawfish Lake 44 mi · North Twin Lake 46 mi · Green Lake 47 mi
See how Thompson Lake stacks up: best rainbow trout lakes in Washington
More water nearby: Grant County fishing maps (18 charts). Browse all Washington 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.