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 does not have enough recent summer sampling to compare 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.
Stays via Stay22
Where to stay near Mason Lake
Compare cabins, hotels, and vacation rentals near Mason Lake in Otter Tail County, Minnesota. Live availability and prices for your nights. Switch the map to Satellite to see how close each stay is to the water.
Top-rated places to stay near Mason Lake
Prices for Nov 6–8, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Mason Lake?
Get lake water-quality updates plus the best cabin & lodging deals near Mason Lake — straight to your inbox. No spam, unsubscribe anytime.
Watch Mason Lake water quality
Get an email when the clarity or algae readings change. Unsubscribe anytime.