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Minnewashta Lake reads lower on nutrients and algae than Waconia Lake. Both are in Carver County, Minnesota.

Reviewed by LakeQuality Editorial Team · Updated

Minnewashta Lake and Waconia 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. Minnewashta Lake reads materially cleaner than Waconia 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: Minnewashta 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?

Minnewashta Lake

Carver County, Minnesota

Good clarity, visible to about 11.5 ft.

Waconia Lake

Carver County, Minnesota

Moderate clarity, visible to about 7.3 ft.

Side-by-Side Metrics

MetricMinnewashta LakeWaconia Lake
Water Clarity11.5 ft Better7.3 ft
Phosphorus14 µg/L Better30 µg/L
Chlorophyll-a (Algae)2.3 µg/L Better9.8 µg/L
Maximum Depth70 ft Better37 ft
Surface Area680 acres3,080 acres
Public AccessYesYes
Fish Species1416 Better
Trophic Statemesotrophiceutrophic

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

Minnewashta Lake reads lower on nutrients and algae than Waconia Lake. Water clarity: 11.5 ft vs 7.3 ft. For more fish-species variety, Waconia Lake edges ahead with 16 documented species.

Source: EPA National Aquatic Resource Surveys, 2026.