Ripple Lake vs Round Lake
Water quality, depth, fish species, and recreation comparison.
Round Lake has a higher water quality grade (A, Excellent) than Ripple Lake (C, Fair). 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 grade differences here are about the lakes themselves, not the agencies grading them. Round Lake (A) is materially cleaner than Ripple Lake (C). 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 grade gap is decisive — Round 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?
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 |
|---|---|---|
| Overall Grade | C (Fair) | A (Excellent) |
| Water Clarity | 4.5 ft | 14.5 ft |
| Phosphorus | 21 µg/L | 10 µg/L |
| Chlorophyll-a (Algae) | 14.4 µg/L | 2.7 µg/L |
| Maximum Depth | 39 ft | 125 ft |
| Surface Area | 630 acres | 737 acres |
| Public Access | Yes | Yes |
| Fish Species | 17 | 18 |
| Trophic State | eutrophic | oligotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Round Lake wins on overall water quality with a Grade A versus Ripple Lake's Grade C. 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.