Ripple Lake vs Round Lake
Water quality, depth, fish species, and recreation comparison.
Round Lake reads lower on nutrients and algae than Ripple Lake. Both are in Aitkin County, Minnesota.
Both Ripple Lake and Round 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. Round Lake reads materially cleaner than Ripple 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: Round 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?
Ripple Lake
Murky, only visible to about 4.5 ft.
Round Lake
Good clarity, visible to about 14.5 ft.
Side-by-Side Metrics
| Metric | Ripple Lake | Round Lake |
|---|---|---|
| Water Clarity | 4.5 ft | 14.5 ft Better |
| Phosphorus | 21 µg/L | 10 µg/L Better |
| Chlorophyll-a (Algae) | 14.4 µg/L | 2.7 µg/L Better |
| Maximum Depth | 39 ft | 125 ft Better |
| Surface Area | 630 acres | 737 acres |
| Public Access | Yes | Yes |
| Fish Species | 17 | 18 Better |
| Trophic State | eutrophic | oligotrophic |
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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Compare Ripple Lake or Round Lake against a different lake.
Verdict
Round Lake reads lower on nutrients and algae than Ripple Lake. Water clarity: 14.5 ft vs 4.5 ft. For fishing diversity, Round Lake also leads with 18 species.
Source: EPA National Aquatic Resource Surveys, 2026.