Thompson Lake, Maine
4,419 acres
Surface Area
121 ft
Max Depth
35 ft
Average Depth
32.2 mi
Shoreline
322 ft
Surface Elevation
Where It Sits, and How Deep It Goes
Locator - Maine
44.07 degrees N, 70.49 degrees W - Oxford County. State and county outlines drawn from Census boundary data; the lake marker is placed by its Maine DEP coordinates, not by eye. Schematic - not a survey map.
Depth Profile - Thompson Lake
Schematic cross-section drawn to one shared depth scale - not a survey or bathymetric map.
How Thompson Lake Stacks Up
- Its average depth of 35 ft is more than 3 times a typical shallow Maine lake, which averages under 10 ft.
- About 14 miles from Lewiston, as the crow flies.
- 22 fish species on the DEP list for this lake.
Fish Species
Landlocked SalmonLake TroutLake WhitefishSmallmouth BassNorthern PikeChain PickerelWhite PerchYellow PerchRainbow SmeltBurbot (Cusk)American EelBanded KillifishBlacknose ShinerBrown BullheadCommon ShinerFallfishGolden ShinerInvasive) Largemouth BassPumpkinseedRedbreast SunfishSlimy SculpinWhite Sucker
Species recorded for this lake. Presence only - no abundance ratings.
Facts and Figures
Lake ID (MIDAS)3444
CountyOxford
TownsPoland, Casco, Otisfield, Oxford
Lake TypeColdwater + Warmwater
Coordinates44.0691, -70.4901
Deepest Natural Lakes in Maine
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Sebago Lake | Cumberland | 30,536 acres | 316 ft |
| 2 | Moosehead Lake | Piscataquis | 75,473 acres | 246 ft |
| 3 | Tunk Lake | Hancock | 2,071 acres | 222 ft |
| 4 | Pleasant Pond | Somerset | 1,037 acres | 198 ft |
| 5 | Schoodic Lake | Piscataquis | 7,021 acres | 188 ft |
Largest Lakes in Maine
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Moosehead Lake | Piscataquis | 75,473 acres | 246 ft |
| 2 | Sebago Lake | Cumberland | 30,536 acres | 316 ft |
| 3 | Chesuncook Lake | Piscataquis | 28,250 acres | 150 ft |
| 4 | Spednic Lake | Washington | 19,618 acres | 54 ft |
| 5 | South Twin Lake | Penobscot, Piscataquis | 18,652 acres | 101 ft |
Sources: Maine DEP / Lakes of Maine lake data (ID 3444); USGS. Verified October 30, 2026.