Inguadona Lake vs Little Boy Lake
Water quality, depth, fish species, and recreation comparison.
Inguadona Lake and Little Boy Lake both received the same overall water quality grade of A (Excellent). Both are in Cass County, Minnesota.
Inguadona Lake and Little Boy Lake are both in Minnesota — a same-state head-to-head where the comparison comes down to lake-specific differences in depth, watershed, and monitoring history rather than the broader state-level water-quality regime. The grades are close: Inguadona Lake (A) and Little Boy Lake (A) are within one letter of each other on the LakeGrade rubric. The per-parameter sub-grades below will show where the small differences actually live.
With grades this close, the choice between the two lakes turns on non-water-quality factors: depth, fish species, public access, distance from home. The per-lake pages below cover all of those.
Inguadona Lake
Good clarity, visible to about 12 ft.
Little Boy Lake
Good clarity, visible to about 11 ft.
Side-by-Side Metrics
| Metric | Inguadona Lake | Little Boy Lake |
|---|---|---|
| Overall Grade | A (Excellent) | A (Excellent) |
| Water Clarity | 12 ft | 11 ft |
| Phosphorus | 15 µg/L | 14 µg/L |
| Chlorophyll-a (Algae) | 4.5 µg/L | 5.1 µg/L |
| Maximum Depth | 79 ft | 74 ft |
| Surface Area | 1,133 acres | 1,452 acres |
| Public Access | Yes | Yes |
| Fish Species | 20 | 18 |
| Trophic State | mesotrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Both lakes earn the same Grade A. The tiebreakers come down to clarity (Inguadona Lake: 12 ft, Little Boy Lake: 11 ft) and what you want from the lake. Inguadona Lake supports more documented fish species.
Source: EPA National Aquatic Resource Surveys, 2026.