Lakes / Maine / Flagstaff Lake
Flagstaff Lake, Maine
17,367 acres
Surface Area
50 ft
Max Depth
18 ft
Average Depth
147.2 mi
Shoreline
1,144 ft
Surface Elevation
Where It Sits, and How Deep It Goes
Locator - Maine
45.19 degrees N, 70.27 degrees W - Somerset 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 - Flagstaff Lake
Schematic cross-section drawn to one shared depth scale - not a survey or bathymetric map.
How Flagstaff Lake Stacks Up
- Ranks #7 for surface area among the Maine lakes counted so far - 17,367 acres.
- The largest lake in Somerset County among those counted.
- About 65 miles from Augusta, as the crow flies.
- 18 fish species on the DEP list for this lake.
Fish Species
Landlocked SalmonBrook TroutChain PickerelYellow PerchRainbow SmeltBurbot (Cusk)American EelBlacknose DaceBrown BullheadCommon ShinerCreek ChubFallfishFinescale DaceGolden ShinerLake ChubNorthern Redbelly DaceSlimy SculpinWhite Sucker
Species recorded for this lake. Presence only - no abundance ratings.
Facts and Figures
Lake ID (MIDAS)38
CountySomerset
TownsEustis, Bigelow Twp, Carrying Place Town Twp, Dead
Lake TypeWarmwater
Coordinates45.1891, -70.2748
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 38); USGS. Verified October 30, 2026.