Iron Lake vs Nibin Lake
Water quality, depth, fish species, and recreation comparison.
Iron Lake and Nibin Lake both received the same overall water quality grade of D (Poor). Both are in St. Louis County, Minnesota.
Both Iron Lake and Nibin Lake sit in Minnesota. A same-state comparison strips out the state-level water-quality regime as a variable: any grade differences here are about the lakes themselves, not the agencies grading them. The grades are close: Iron Lake (D) and Nibin Lake (D) are within one letter of each other on the LakeGrade rubric. The per-parameter sub-grades below will show where the small differences actually live.
With grades this close, the choice between the two lakes turns on non-water-quality factors: depth, fish species, public access, distance from home. The per-lake pages below cover all of those.
Iron Lake
Murky, only visible to about 5 ft.
Nibin Lake
Murky, only visible to about 5.6 ft.
Side-by-Side Metrics
| Metric | Iron Lake | Nibin Lake |
|---|---|---|
| Overall Grade | D (Poor) | D (Poor) |
| Water Clarity | 5 ft | 5.6 ft |
| Phosphorus | No data | No data |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 64 ft | 40 ft |
| Surface Area | 2.0K acres | 775.93 acres |
| Public Access | No | No |
| Fish Species | 9 | 5 |
| Trophic State | eutrophic | eutrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Both lakes earn the same Grade D. The tiebreakers come down to clarity (Iron Lake: 5 ft, Nibin Lake: 5.6 ft) and what you want from the lake. Iron Lake supports more documented fish species.