Fish Lake vs Knife Lake
Water quality, depth, fish species, and recreation comparison.
Fish Lake and Knife Lake both received the same overall water quality grade of F (Very Poor). Both are in Kanabec County, Minnesota.
Fish Lake and Knife 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 grades are close: Fish Lake (F) and Knife Lake (F) 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.
Fish Lake
Very murky, less than 2 ft of visibility.
Knife Lake
Very murky, less than 2.3 ft of visibility.
Side-by-Side Metrics
| Metric | Fish Lake | Knife Lake |
|---|---|---|
| Overall Grade | F (Very Poor) | F (Very Poor) |
| Water Clarity | 2 ft | 2.3 ft |
| Phosphorus | No data | 161.5 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | - | - |
| Surface Area | 440 acres | 1.3K acres |
| Public Access | Unknown | Unknown |
| Fish Species | 1 | 1 |
| Trophic State | eutrophic | hypereutrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Both lakes earn the same Grade F. The tiebreakers come down to clarity (Fish Lake: 2 ft, Knife Lake: 2.3 ft) and what you want from the lake. Fish Lake matches its peer on species count.