Mesotrophic Lakes in Indiana
9 mesotrophic lakes in Indiana. Moderate nutrients, good water quality.
Most well-managed working lakes register as mesotrophic — the band that balances productivity with clarity. 9 lakes in Indiana sit in the mesotrophic band. About 0% are deep (50+ ft); the rest are shallower basins where watershed management keeps nutrients from pushing the system into eutrophy.
Mesotrophic lakes tend to grade B or C on the LakeGrade rubric — the productive-but-clear band lines up with the middle of the letter grades.
| # | Lake | County | Grade | Clarity | Depth | TSI |
|---|---|---|---|---|---|---|
| 1 | Middle Lagoon Lake | Lake | A | - | - | 43 |
| 2 | Dewart Lake | Kosciusko | B | 10.2 ft | - | 44 |
| 3 | Oswego Lake | Kosciusko | B | 9.9 ft | - | 44 |
| 4 | Grand Calumet Lagoon Lake | Lake | B | - | - | 49 |
| 5 | Big Chapman Lake | Kosciusko | C | 6.9 ft | - | 49 |
| 6 | Tippecanoe Lake | Kosciusko | C | 8.5 ft | - | 46 |
| 7 | Lamb Lake | Johnson | C | 7.2 ft | - | 49 |
| 8 | Center Lake | Kosciusko | C | 8.7 ft | - | 46 |
| 9 | Syracuse Lake | Kosciusko | C | 8.8 ft | - | 46 |
All mesotrophic lakes →Minnesota version →Wisconsin version →Illinois version →Michigan version →Iowa version →Ohio version →Pennsylvania version →New York version →Missouri version →North Dakota version →South Dakota version →All Indiana lakes →
Source: EPA National Aquatic Resource Surveys, 2026.