Boy Lake vs Long Lake
Water quality, depth, fish species, and recreation comparison.
Long Lake has a higher water quality grade (A, Excellent) than Boy Lake (B, Good). Both are in Cass County, Minnesota.
Boy Lake and Long 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. These two are within a letter of each other on the rubric — Boy Lake (B) versus Long Lake (A). The deciding factors for a recreational visitor are likely physical (depth, access, fish species) rather than water-quality differences.
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.
Boy Lake
Moderate clarity, visible to about 8.9 ft.
Long Lake
Crystal clear, you can see 21.5 ft down.
Side-by-Side Metrics
| Metric | Boy Lake | Long Lake |
|---|---|---|
| Overall Grade | B (Good) | A (Excellent) |
| Water Clarity | 8.9 ft | 21.5 ft |
| Phosphorus | 21 µg/L | 9 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 45 ft | 115 ft |
| Surface Area | 3.3K acres | 1.0K acres |
| Public Access | Yes | Yes |
| Fish Species | 1 | 1 |
| Trophic State | mesotrophic | oligotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Long Lake wins on overall water quality with a Grade A versus Boy Lake's Grade B. Water clarity: 21.5 ft vs 8.9 ft. For fishing diversity, Long Lake also leads with 1 species.