Birch Lake vs George Lake
Water quality, depth, fish species, and recreation comparison.
Birch Lake has a higher water quality grade (A, Excellent) than George Lake (C, Fair). Both are in Cass County, Minnesota.
Both Birch Lake and George 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 meaningfully apart: Birch Lake grades a A while George Lake grades a C. That two-letter spread reflects real underlying differences — different watershed inputs, different depth profiles, or different monitoring rigor.
For a recreational visitor, the wider grade gap is decisive — Birch 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?
Birch Lake
Good clarity, visible to about 14 ft.
George Lake
Murky, only visible to about 5 ft.
Side-by-Side Metrics
| Metric | Birch Lake | George Lake |
|---|---|---|
| Overall Grade | A (Excellent) | C (Fair) |
| Water Clarity | 14 ft | 5 ft |
| Phosphorus | 12 µg/L | 40 µg/L |
| Chlorophyll-a (Algae) | 4 µg/L | 7.3 µg/L |
| Maximum Depth | 45 ft | 20 ft |
| Surface Area | 1,267 acres | 612 acres |
| Public Access | Yes | Yes |
| Fish Species | 14 | 11 |
| Trophic State | mesotrophic | eutrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Birch Lake wins on overall water quality with a Grade A versus George Lake's Grade C. Water clarity: 14 ft vs 5 ft. For fishing diversity, Birch Lake also leads with 14 species.
Source: EPA National Aquatic Resource Surveys, 2026.