Pike Lake vs Rainy Lake
Water quality, depth, fish species, and recreation comparison.
Pike Lake has a higher water quality grade (A, Excellent) than Rainy Lake (D, Poor). Both are in St. Louis County, Minnesota.
Pike Lake and Rainy 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. Pike Lake (A) is materially cleaner than Rainy Lake (D). A gap that wide is unlikely to close in a single year of remediation work; it reflects multi-decade differences in the lakes themselves.
For a recreational visitor, the wider grade gap is decisive — Pike Lake is the better water-quality choice. For a researcher, the gap is the interesting part: what is different about the two watersheds, and which of those differences is mutable?
Pike Lake
Crystal clear, you can see 18 ft down.
Rainy Lake
Murky, only visible to about 5.9 ft.
Side-by-Side Metrics
| Metric | Pike Lake | Rainy Lake |
|---|---|---|
| Overall Grade | A (Excellent) | D (Poor) |
| Water Clarity | 18 ft | 5.9 ft |
| Phosphorus | No data | No data |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 60 ft | 161 ft |
| Surface Area | 488.26 acres | 210.2K acres |
| Public Access | Yes | Yes |
| Fish Species | 1 | 1 |
| Trophic State | oligotrophic | eutrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Pike Lake wins on overall water quality with a Grade A versus Rainy Lake's Grade D. Water clarity: 18 ft vs 5.9 ft. For fishing diversity, Pike Lake also leads with 1 species.