Big Lake vs Moose Lake
Water quality, depth, fish species, and recreation comparison.
Big Lake and Moose Lake both received the same overall water quality grade of A (Excellent). Both are in Beltrami County, Minnesota.
Both Big Lake and Moose 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. These two are within a letter of each other on the rubric — Big Lake (A) versus Moose Lake (A). The deciding factors for a recreational visitor are likely physical (depth, access, fish species) rather than water-quality differences.
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.
Big Lake
Moderate clarity, visible to about 9.7 ft.
Moose Lake
Crystal clear, you can see 15.1 ft down.
Side-by-Side Metrics
| Metric | Big Lake | Moose Lake |
|---|---|---|
| Overall Grade | A (Excellent) | A (Excellent) |
| Water Clarity | 9.7 ft | 15.1 ft |
| Phosphorus | 15 µg/L | 11 µg/L |
| Chlorophyll-a (Algae) | 4.8 µg/L | 2.2 µg/L |
| Maximum Depth | 35 ft | 71 ft |
| Surface Area | 3,598 acres | 601 acres |
| Public Access | Yes | Yes |
| Fish Species | 17 | 12 |
| Trophic State | mesotrophic | oligotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Both lakes earn the same Grade A. The tiebreakers come down to clarity (Big Lake: 9.7 ft, Moose Lake: 15.1 ft) and what you want from the lake. Big Lake supports more documented fish species.
Source: EPA National Aquatic Resource Surveys, 2026.