North Twin Lake vs South Twin Lake
Water quality, depth, fish species, and recreation comparison.
North Twin Lake and South Twin Lake read the same on nutrients and algae. Both are in Mahnomen County, Minnesota.
North Twin Lake and South Twin Lake are both in Minnesota — a same-state head-to-head where the comparison comes down to lake-specific differences in depth, watershed, and monitoring history rather than the broader state-level water-quality regime. The readings are close: North Twin Lake and South Twin Lake sit within a narrow band of each other on phosphorus, chlorophyll-a and clarity. The per-parameter table below shows where the small differences actually live.
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.
North Twin Lake
Moderate clarity, visible to about 8.5 ft.
South Twin Lake
Good clarity, visible to about 10.2 ft.
Side-by-Side Metrics
| Metric | North Twin Lake | South Twin Lake |
|---|---|---|
| Water Clarity | 8.5 ft | 10.2 ft Better |
| Phosphorus | 17 µg/L | 13.5 µg/L Better |
| Chlorophyll-a (Algae) | 5.9 µg/L | 3.1 µg/L Better |
| Maximum Depth | 16 ft | 29 ft Better |
| Surface Area | 966 acres | 1,127 acres |
| Public Access | No | Yes |
| Fish Species | 14 | 15 Better |
| Trophic State | mesotrophic | mesotrophic |
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 North Twin Lake or South Twin Lake against a different lake.
Verdict
Both lakes earn the same Grade A. The tiebreakers come down to clarity (North Twin Lake: 8.5 ft, South Twin Lake: 10.2 ft) and what you want from the lake. North Twin Lake has fewer fish species than South Twin Lake.
Source: EPA National Aquatic Resource Surveys, 2026.