Island Lake vs Portage Lake
Water quality, depth, fish species, and recreation comparison.
Island Lake has a higher water quality grade (A, Excellent) than Portage Lake (C, Fair). Both are in Hubbard County, Minnesota.
A
Island Lake
Hubbard County, Minnesota
Good clarity, visible to about 10.5 ft.
C
Portage Lake
Hubbard County, Minnesota
Murky, only visible to about 5.7 ft.
Side-by-Side Metrics
| Metric | Island Lake | Portage Lake |
|---|---|---|
| Overall Grade | A (Excellent) | C (Fair) |
| Water Clarity | 10.5 ft | 5.7 ft |
| Phosphorus | 17 µg/L | 28 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 65 ft | 17 ft |
| Surface Area | 541.25 acres | 428.71 acres |
| Public Access | Yes | Yes |
| Fish Species | 16 | 12 |
| Trophic State | mesotrophic | eutrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Island Lake wins on overall water quality with a Grade A versus Portage Lake's Grade C. Water clarity: 10.5 ft vs 5.7 ft. For fishing diversity, Island Lake also leads with 16 species.