Mousam Lake, Maine
981 acres
Surface Area
98 ft
Max Depth
17 ft
Average Depth
23.1 mi
Shoreline
478 ft
Surface Elevation
Where It Sits, and How Deep It Goes
Locator - Maine
43.51 degrees N, 70.86 degrees W - York 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 - Mousam Lake
Schematic cross-section drawn to one shared depth scale - not a survey or bathymetric map.
How Mousam Lake Stacks Up
- About 32 miles from Portland, as the crow flies.
- 23 fish species on the DEP list for this lake.
Fish Species
Landlocked SalmonBrook TroutLake TroutBrown TroutSmallmouth BassChain PickerelWhite PerchYellow PerchBlack CrappieLandlocked AlewifeRainbow SmeltAmerican EelBanded KillifishBlacknose DaceBrown BullheadCommon ShinerFallfishGolden ShinerInvasive) Largemouth BassLake ChubPumpkinseedRedbreast SunfishWhite Sucker
Species recorded for this lake. Presence only - no abundance ratings.
Facts and Figures
Lake ID (MIDAS)3838
CountyYork
TownsActon, Shapleigh
Lake TypeColdwater + Warmwater
Coordinates43.5075, -70.8588
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 3838); USGS. Verified October 30, 2026.