Long Lake, Iron County, Michigan
60 acres
Surface Area
105 ft
Max Depth
33.9 ft
Average Depth
1,416 ft
Surface Elevation
Where It Sits, and How Deep It Goes
Locator - Michigan
46.12 degrees N, 88.45 degrees W - Iron County. State and county outlines drawn from Census boundary data; the lake marker is placed by its Michigan DNR coordinates, not by eye. Schematic - not a survey map.
Depth Profile - Long Lake
Schematic cross-section drawn to one shared depth scale - not a survey or bathymetric map.
How Long Lake Stacks Up
- Its average depth of 33.9 ft is more than 3 times a typical shallow Michigan lake, which averages under 10 ft.
- About 58 miles from Marquette, as the crow flies.
Facts and Figures
Waterbody ID36-331
CountyIron
Coordinates46.1205, -88.4508
Deepest Natural Lakes in Michigan
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Torch Lake | Antrim | 18,713 acres | 285 ft |
| 2 | Elk Lake | Antrim | 8,194 acres | 192 ft |
| 3 | Crystal Lake | Benzie | 9,865 acres | 175 ft |
| 4 | Lake Angeline | Marquette | - | 162 ft |
| 5 | Syphon Lake | Luce | 11 acres | 160 ft |
Largest Lakes in Michigan
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Houghton Lake | Roscommon | 20,070 acres | 21 ft |
| 2 | Torch Lake | Antrim | 18,713 acres | 285 ft |
| 3 | Burt Lake | Cheboygan | 17,393 acres | 73 ft |
| 4 | Lake Charlevoix | Charlevoix | 17,256 acres | 120 ft |
| 5 | Mullett Lake | Cheboygan | 16,702 acres | 120 ft |
Sources: Michigan DNR lake data (ID 36-331); USGS. Verified October 30, 2026.