Crystal Lake vs Prairie Lake
Water quality, depth, fish species, and recreation comparison.
Crystal Lake and Prairie Lake both received the same overall water quality grade of B (Good). Both are in Otter Tail County, Minnesota.
Crystal Lake and Prairie 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 — Crystal Lake (B) versus Prairie Lake (B). 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.
Crystal Lake
Good clarity, visible to about 10.2 ft.
Prairie Lake
Moderate clarity, visible to about 8.9 ft.
Side-by-Side Metrics
| Metric | Crystal Lake | Prairie Lake |
|---|---|---|
| Overall Grade | B (Good) | B (Good) |
| Water Clarity | 10.2 ft | 8.9 ft |
| Phosphorus | 20 µg/L | 18 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 55 ft | 22 ft |
| Surface Area | 1.4K acres | 1.0K acres |
| Public Access | Yes | Yes |
| Fish Species | 1 | 1 |
| 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 B. The tiebreakers come down to clarity (Crystal Lake: 10.2 ft, Prairie Lake: 8.9 ft) and what you want from the lake. Crystal Lake matches its peer on species count.