Is Mason Lake Safe for Swimming?
Mason Lake in Otter Tail County, Minnesota has limited nutrient and algae sampling on record. Chlorophyll-a in the monitoring record runs high enough that algae is a factor. A water-quality reading is not a swimming clearance. The state water agency and county health departments post current advisories; check them before you swim.. Water clarity: 3 ft visibility. Phosphorus: 21 µg/L. Chlorophyll-a (algae): 16.9 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Water Clarity (Secchi Depth) | 3 ft |
| Phosphorus | 21 μg/L |
| Chlorophyll-a (Algae) | 16.9 μg/L |
| Maximum Depth | 108 ft |
| Location | Otter Tail County, Minnesota |
How does Mason Lake compare?
Mason Lake is not rated for water quality — it does not have enough recent summer sampling for a readings, so it is not compared with the Minnesota state average.
Water clarity (Secchi depth) sits at 3 feet. That falls into moderate clarity — typical for lakes with some nutrient enrichment. Algae levels (chlorophyll-a) measure 16.9 µg/L — moderate; acceptable for swimming on most days, but worth checking advisories.
Watch Mason Lake water quality
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