Blackduck Lake vs Gull Lake
Water quality, depth, fish species, and recreation comparison.
Gull Lake reads lower on nutrients and algae than Blackduck Lake. Both are in Beltrami County, Minnesota.
Blackduck Lake and Gull 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. These two sit close on their nutrient and algae readings, Blackduck Lake versus Gull Lake. The deciding factors for a recreational visitor are likely physical (depth, access, fish species) rather than water-quality differences.
With readings 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.
Gull Lake
Moderate clarity, visible to about 7.9 ft.
Side-by-Side Metrics
| Metric | Blackduck Lake | Gull Lake |
|---|---|---|
| Water Clarity | 6.2 ft | 7.9 ft Better |
| Phosphorus | 34 µg/L | 26 µg/L Better |
| Chlorophyll-a (Algae) | 12.3 µg/L | 6.3 µg/L Better |
| Maximum Depth | 28 ft Better | 23 ft |
| Surface Area | 2,711 acres | 2,256 acres |
| Public Access | Yes | Yes |
| Fish Species | 16 Better | 13 |
| Trophic State | eutrophic | mesotrophic |
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
Blackduck Lake and Gull Lake read the same on nutrients and algae overall. The tiebreakers come down to clarity (Blackduck Lake: 6.2 ft, Gull Lake: 7.9 ft) and what you want from the lake. Blackduck Lake supports more documented fish species.
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Where to stay near Blackduck Lake and Gull Lake
Compare cabins, hotels, and vacation rentals around Blackduck Lake and Gull Lake. Both lakes are pinned on the map, so you can see which stays sit nearer the one you pick. Switch to Satellite to see how close each is to the water.
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Source: EPA National Aquatic Resource Surveys, 2026.