Lake Koshkonong vs Lake Ripley
Water quality, depth, fish species, and recreation comparison.
Lake Ripley reads lower on nutrients and algae than Lake Koshkonong. Both are in Jefferson County, Wisconsin.
Lake Koshkonong and Lake Ripley are both in Wisconsin — 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: Lake Ripley carries clearly lower phosphorus and chlorophyll-a readings than Lake Koshkonong. 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: Lake Ripley 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?
Lake Koshkonong
Very murky, less than 1.7 ft of visibility.
Lake Ripley
Moderate clarity, visible to about 9 ft.
Side-by-Side Metrics
| Metric | Lake Koshkonong | Lake Ripley |
|---|---|---|
| Water Clarity | 1.7 ft | 9 ft Better |
| Phosphorus | 287 µg/L | 21.8 µg/L Better |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 7 ft | 44 ft Better |
| Surface Area | 10,595 acres | 420 acres |
| Public Access | Yes | Yes |
| Fish Species | 7 Better | 4 |
| Trophic State | hypereutrophic | mesotrophic |
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
Lake Ripley reads lower on nutrients and algae than Lake Koshkonong. Water clarity: 9 ft vs 1.7 ft. For more fish-species variety, Lake Koshkonong edges ahead with 7 documented species.
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Where to stay near Lake Koshkonong and Lake Ripley
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Source: EPA National Aquatic Resource Surveys, 2026.