Big Spunk Lake vs Cedar Island Lake
Water quality, depth, fish species, and recreation comparison.
Big Spunk Lake reads lower on nutrients and algae than Cedar Island Lake. Both are in Stearns County, Minnesota.
Big Spunk Lake and Cedar Island 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 readings are meaningfully apart: Big Spunk Lake carries clearly lower phosphorus and chlorophyll-a readings than Cedar Island Lake. A spread that wide reflects real underlying differences, in watershed inputs, depth profiles, or monitoring rigor.
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.
Cedar Island Lake
Murky, only visible to about 3.5 ft.
Side-by-Side Metrics
| Metric | Big Spunk Lake | Cedar Island Lake |
|---|---|---|
| Water Clarity | 10 ft Better | 3.5 ft |
| Phosphorus | 14 µg/L Better | 63.5 µg/L |
| Chlorophyll-a (Algae) | 3.7 µg/L Better | 44 µg/L |
| Maximum Depth | 38 ft | 75 ft Better |
| Surface Area | 415 acres | 986 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 Cedar Island Lake. Water clarity: 10 ft vs 3.5 ft. For more fish-species variety, Cedar Island Lake edges ahead with 22 documented species.
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Source: EPA National Aquatic Resource Surveys, 2026.