Blackduck Lake vs Medicine Lake
Water quality, depth, fish species, and recreation comparison.
Medicine Lake has a higher water quality grade (B, Good) than Blackduck Lake (C, Fair). Both are in Beltrami County, Minnesota.
Both Blackduck Lake and Medicine 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: Blackduck Lake (C) and Medicine Lake (B) 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.
Blackduck Lake
Murky, only visible to about 6.2 ft.
Medicine Lake
Moderate clarity, visible to about 7.9 ft.
Side-by-Side Metrics
| Metric | Blackduck Lake | Medicine Lake |
|---|---|---|
| Overall Grade | C (Fair) | B (Good) |
| Water Clarity | 6.2 ft | 7.9 ft |
| Phosphorus | 39.5 µg/L | 22 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 28 ft | 44 ft |
| Surface Area | 2.7K acres | 461.28 acres |
| Public Access | Yes | Yes |
| Fish Species | 1 | 1 |
| Trophic State | eutrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Medicine Lake wins on overall water quality with a Grade B versus Blackduck Lake's Grade C. Water clarity: 7.9 ft vs 6.2 ft. For fishing diversity, Medicine Lake also leads with 1 species.