Oak Lake vs Sturgeon Lake
Water quality, depth, fish species, and recreation comparison.
Sturgeon Lake has a higher water quality grade (A, Excellent) than Oak Lake (D, Poor). Both are in Pine County, Minnesota.
Oak Lake and Sturgeon 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 meaningfully apart: Sturgeon Lake grades a A while Oak Lake grades a D. That two-letter spread reflects real underlying differences — different watershed inputs, different depth profiles, or different monitoring rigor.
For a recreational visitor, the wider grade gap is decisive — Sturgeon 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?
Oak Lake
Murky, only visible to about 3.8 ft.
Sturgeon Lake
Crystal clear, you can see 16 ft down.
Side-by-Side Metrics
| Metric | Oak Lake | Sturgeon Lake |
|---|---|---|
| Overall Grade | D (Poor) | A (Excellent) |
| Water Clarity | 3.8 ft | 16 ft |
| Phosphorus | No data | No data |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 20 ft | 40 ft |
| Surface Area | 458.74 acres | 1.7K acres |
| Public Access | Yes | Yes |
| Fish Species | 1 | 1 |
| Trophic State | eutrophic | oligotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Sturgeon Lake wins on overall water quality with a Grade A versus Oak Lake's Grade D. Water clarity: 16 ft vs 3.8 ft. For fishing diversity, Sturgeon Lake also leads with 1 species.