Big Spunk Lake vs Sauk Lake
Water quality, depth, fish species, and recreation comparison.
Big Spunk Lake reads lower on nutrients and algae than Sauk Lake. Both are in Stearns County, Minnesota.
Big Spunk Lake and Sauk 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. Big Spunk Lake reads materially cleaner than Sauk 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.
Sauk Lake
Murky, only visible to about 3.9 ft.
Side-by-Side Metrics
| Metric | Big Spunk Lake | Sauk Lake |
|---|---|---|
| Water Clarity | 10 ft Better | 3.9 ft |
| Phosphorus | 14 µg/L Better | 52 µg/L |
| Chlorophyll-a (Algae) | 3.7 µg/L Better | 22.3 µg/L |
| Maximum Depth | 38 ft | 61 ft Better |
| Surface Area | 415 acres | 2,126 acres |
| Public Access | Yes | Yes |
| Fish Species | 19 Better | 18 |
| 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 Sauk Lake. Water clarity: 10 ft vs 3.9 ft. For fishing diversity, Big Spunk Lake also leads with 19 species.
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Source: EPA National Aquatic Resource Surveys, 2026.