Big Spunk Lake vs Koronis Lake
Water quality, depth, fish species, and recreation comparison.
Big Spunk Lake reads lower on nutrients and algae than Koronis Lake. Both are in Stearns County, Minnesota.
Both Big Spunk Lake and Koronis Lake sit in Minnesota. A same-state comparison strips out the state-level water-quality regime as a variable: any differences in the readings here are about the lakes themselves, not the agencies sampling them. Big Spunk Lake reads materially cleaner than Koronis Lake on nutrients and algae. 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 gap in the readings is decisive: Big Spunk Lake has the lower nutrient and algae numbers. For a researcher, the gap is the interesting part: what is different about the two watersheds, and which of those differences is mutable?
Big Spunk Lake
Good clarity, visible to about 10 ft.
Koronis Lake
Murky, only visible to about 6 ft.
Side-by-Side Metrics
| Metric | Big Spunk Lake | Koronis Lake |
|---|---|---|
| Water Clarity | 10 ft Better | 6 ft |
| Phosphorus | 14 µg/L Better | 27 µg/L |
| Chlorophyll-a (Algae) | 3.7 µg/L Better | 13.8 µg/L |
| Maximum Depth | 38 ft | 132 ft Better |
| Surface Area | 415 acres | 2,968 acres |
| Public Access | Yes | Yes |
| Fish Species | 19 | 22 Better |
| Trophic State | mesotrophic | eutrophic |
A green ✓ marks the better value for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better). Surface area and trophic state carry no tick — a bigger lake is not a better lake.
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Verdict
Big Spunk Lake reads lower on nutrients and algae than Koronis Lake. Water clarity: 10 ft vs 6 ft. For more fish-species variety, Koronis Lake edges ahead with 22 documented species.
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Source: EPA National Aquatic Resource Surveys, 2026.