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Elbow Lake reads lower on nutrients and algae than Tulaby Lake. Both are in Minnesota.

Reviewed by LakeQuality Editorial Team · Updated

Both Elbow Lake and Tulaby 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. The readings are meaningfully apart: Elbow Lake carries clearly lower phosphorus and chlorophyll-a readings than Tulaby Lake. 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: Elbow 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?

Elbow Lake

Becker County, Minnesota

Good clarity, visible to about 12.1 ft.

Tulaby Lake

Mahnomen County, Minnesota

Moderate clarity, visible to about 7.8 ft.

Side-by-Side Metrics

MetricElbow LakeTulaby Lake
Water Clarity12.1 ft Better7.8 ft
Phosphorus14 µg/L Better23 µg/L
Chlorophyll-a (Algae)4.8 µg/L Better10.2 µg/L
Maximum Depth76 ft Better43 ft
Surface Area995 acres832 acres
Public AccessYesYes
Fish Species17 Better16
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

Elbow Lake reads lower on nutrients and algae than Tulaby Lake. Water clarity: 12.1 ft vs 7.8 ft. For fishing diversity, Elbow Lake also leads with 17 species.

Source: EPA National Aquatic Resource Surveys, 2026.