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Fishing Thompson Lake: what the data says
29-acre lake near Grant County. The lake tops out around 25 ft. The depth chart is built from real state fisheries GPS surveys, so the humps, channels and drop-offs you see are measured, not guessed. What follows comes from the same scoring engine that paints the spots above.
Rainbow Trout fishing at Thompson Lake
In spring, rainbow trout run shallow here, mostly 5 to 20 ft. They move out to 7 to 25 ft in summer and finish the year down in 5 to 25 ft. Break off the point is the standout, a drop-off at roughly 18 ft, rated prime for winter rainbow trout. Plan around early morning and the evening in the warm months. Tie on a dodger + spoon (deep troll) or a flutter spoon and you're in the game.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | Inline spinner (silver), Small spoon |
| Summer | 7 to 25 ft | dawn & dusk | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 7 to 25 ft | dawn & dusk | Casting spoon, Jerkbait over shoals |
| Winter | 5 to 25 ft | dawn | Jigging spoon, Tube jig (white) |
Notable structure
- Deep basin: deep basin, around 25 ft
- Break off the point: drop-off, around 18 ft
- Secondary point: point, around 6 ft
- Main-lake point: point, around 5 ft
- Shallow bay flat: weed flat, around 4 ft
Common questions
How deep is Thompson Lake?
Thompson Lake is about 25 ft at its deepest point. The depth chart here comes from real state fisheries GPS surveys, so the contours reflect measured depths.
What fish are in Thompson Lake?
Anglers target rainbow trout on Thompson Lake.
Where is the best fishing spot 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. Open the map above to see every rated spot for each species and season.
When is the best time to fish Thompson Lake?
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.
Nearby waters
Deep Lake · Park Lake · Blue Lake · French Johns Lake · Alkali Lake · Jameson Lake
See how Thompson Lake stacks up: best rainbow trout lakes in Washington
Browse all Washington fishing maps or every water on DepthScout. Bathymetry credit: state fisheries survey programs. How we build these maps. For fishing guidance only, never navigation.