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Maple Lake reads lower on nutrients and algae than Reno Lake. Both are in Minnesota.

Reviewed by LakeQuality Editorial Team · Updated

Both Maple Lake and Reno 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. Maple Lake reads materially cleaner than Reno 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: Maple 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?

Maple Lake

Douglas County, Minnesota

Good clarity, visible to about 14.1 ft.

Reno Lake

Pope County, Minnesota

Moderate clarity, visible to about 7.5 ft.

Side-by-Side Metrics

MetricMaple LakeReno Lake
Water Clarity14.1 ft Better7.5 ft
Phosphorus15 µg/L Better33.5 µg/L
Chlorophyll-a (Algae)3.1 µg/L Better9.6 µg/L
Maximum Depth78 ft Better23 ft
Surface Area831 acres3,809 acres
Public AccessYesYes
Fish Species1718 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.

Verdict

Maple Lake reads lower on nutrients and algae than Reno Lake. Water clarity: 14.1 ft vs 7.5 ft. For more fish-species variety, Reno Lake edges ahead with 18 documented species.

Source: EPA National Aquatic Resource Surveys, 2026.