Eagle Lake vs Portage Lake
Water quality, depth, fish species, and recreation comparison.
Eagle Lake reads lower on nutrients and algae than Portage Lake. Both are in Hubbard County, Minnesota.
Eagle Lake and Portage 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. The readings are meaningfully apart: Eagle Lake carries clearly lower phosphorus and chlorophyll-a readings than Portage 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: Eagle 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?
Eagle Lake
Good clarity, visible to about 11.2 ft.
Portage Lake
Murky, only visible to about 5.5 ft.
Side-by-Side Metrics
| Metric | Eagle Lake | Portage Lake |
|---|---|---|
| Water Clarity | 11.2 ft Better | 5.5 ft |
| Phosphorus | 14.5 µg/L Better | 30.5 µg/L |
| Chlorophyll-a (Algae) | 4.7 µg/L Better | 11.2 µg/L |
| Maximum Depth | 77 ft Better | 17 ft |
| Surface Area | 424 acres | 429 acres |
| Public Access | Yes | Yes |
| Fish Species | 16 Better | 12 |
| Trophic State | mesotrophic | eutrophic |
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
Eagle Lake reads lower on nutrients and algae than Portage Lake. Water clarity: 11.2 ft vs 5.5 ft. For fishing diversity, Eagle Lake also leads with 16 species.
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Source: EPA National Aquatic Resource Surveys, 2026.