Little Birch Lake vs Sauk Lake
Water quality, depth, fish species, and recreation comparison.
Little Birch Lake reads lower on nutrients and algae than Sauk Lake. Both are in Minnesota.
Both Little Birch Lake and Sauk 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. Little Birch Lake reads materially cleaner than Sauk Lake on nutrients and algae. 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 gap in the readings is decisive: Little Birch Lake has the lower nutrient and algae numbers. For a researcher, the gap is the interesting part: what is different about the two watersheds, and which of those differences is mutable?
Little Birch Lake
Good clarity, visible to about 13 ft.
Sauk Lake
Murky, only visible to about 3.9 ft.
Side-by-Side Metrics
| Metric | Little Birch Lake | Sauk Lake |
|---|---|---|
| Water Clarity | 13 ft Better | 3.9 ft |
| Phosphorus | 19 µg/L Better | 52 µg/L |
| Chlorophyll-a (Algae) | 3.1 µg/L Better | 22.3 µg/L |
| Maximum Depth | 89 ft Better | 61 ft |
| Surface Area | 839 acres | 2,126 acres |
| Public Access | Yes | Yes |
| Fish Species | 20 Better | 18 |
| Trophic State | mesotrophic | 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 Little Birch Lake or Sauk Lake against a different lake.
Verdict
Little Birch Lake reads lower on nutrients and algae than Sauk Lake. Water clarity: 13 ft vs 3.9 ft. For fishing diversity, Little Birch Lake also leads with 20 species.
Source: EPA National Aquatic Resource Surveys, 2026.