Big Lake vs Upper Red Lake: East Central
Water quality, depth, fish species, and recreation comparison.
Big Lake has a higher water quality grade (A, Excellent) than Upper Red Lake: East Central (C, Fair). Both are in Beltrami County, Minnesota.
Both Big Lake and Upper Red Lake: East Central 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. Big Lake (A) is materially cleaner than Upper Red Lake: East Central (C). A gap that wide is unlikely to close in a single year of remediation work; it reflects multi-decade differences in the lakes themselves.
For a recreational visitor, the wider grade gap is decisive — Big Lake is the better water-quality choice. For a researcher, the gap is the interesting part: what is different about the two watersheds, and which of those differences is mutable?
Big Lake
Moderate clarity, visible to about 9.7 ft.
Upper Red Lake: East Central
Very murky, less than 2 ft of visibility.
Side-by-Side Metrics
| Metric | Big Lake | Upper Red Lake: East Central |
|---|---|---|
| Overall Grade | A (Excellent) | C (Fair) |
| Water Clarity | 9.7 ft | 2 ft |
| Phosphorus | 15 µg/L | 39 µg/L |
| Chlorophyll-a (Algae) | 4.8 µg/L | 13.4 µg/L |
| Maximum Depth | 35 ft | 15 ft |
| Surface Area | 3,598 acres | 119,294 acres |
| Public Access | Yes | No |
| Fish Species | 17 | 15 |
| Trophic State | mesotrophic | eutrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Big Lake wins on overall water quality with a Grade A versus Upper Red Lake: East Central's Grade C. Water clarity: 9.7 ft vs 2 ft. For fishing diversity, Big Lake also leads with 17 species.
Source: EPA National Aquatic Resource Surveys, 2026.