Long Lake vs Pine Mountain Lake
Water quality, depth, fish species, and recreation comparison.
Long Lake and Pine Mountain Lake both received the same overall water quality grade of A (Excellent). Both are in Cass County, Minnesota.
Long Lake and Pine Mountain 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: Long Lake (A) and Pine Mountain 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.
Long Lake
Crystal clear, you can see 21.5 ft down.
Pine Mountain Lake
Crystal clear, you can see 17.5 ft down.
Side-by-Side Metrics
| Metric | Long Lake | Pine Mountain Lake |
|---|---|---|
| Overall Grade | A (Excellent) | A (Excellent) |
| Water Clarity | 21.5 ft | 17.5 ft |
| Phosphorus | 9 µg/L | No data |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 115 ft | 80 ft |
| Surface Area | 1.0K acres | 1.6K acres |
| Public Access | Yes | Yes |
| Fish Species | 1 | 1 |
| Trophic State | oligotrophic | oligotrophic |
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 (Long Lake: 21.5 ft, Pine Mountain Lake: 17.5 ft) and what you want from the lake. Long Lake matches its peer on species count.