Big Sandy Lake vs Minnewawa Lake
Water quality, depth, fish species, and recreation comparison.
Big Sandy Lake and Minnewawa Lake read the same on nutrients and algae. Both are in Aitkin County, Minnesota.
Both Big Sandy Lake and Minnewawa Lake sit in Minnesota. A same-state comparison strips out the state-level water-quality regime as a variable: any differences in the readings here are about the lakes themselves, not the agencies sampling them. These two sit close on the readings, Big Sandy Lake versus Minnewawa 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.
Big Sandy Lake
Murky, only visible to about 4.5 ft.
Minnewawa Lake
Murky, only visible to about 5 ft.
Side-by-Side Metrics
| Metric | Big Sandy Lake | Minnewawa Lake |
|---|---|---|
| Water Clarity | 4.5 ft | 5 ft Better |
| Phosphorus | 30 µg/L | 24.5 µg/L Better |
| Chlorophyll-a (Algae) | 11 µg/L | 11 µg/L |
| Maximum Depth | 84 ft Better | 21 ft |
| Surface Area | 6,125 acres | 2,351 acres |
| Public Access | Yes | Yes |
| Fish Species | 22 Better | 15 |
| Trophic State | eutrophic | eutrophic |
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.
Swap a lake
Compare Big Sandy Lake or Minnewawa Lake against a different lake.
Verdict
Both lakes earn the same Grade C. The tiebreakers come down to clarity (Big Sandy Lake: 4.5 ft, Minnewawa Lake: 5 ft) and what you want from the lake. Big Sandy Lake supports more documented fish species.
Source: EPA National Aquatic Resource Surveys, 2026.