Is Green Lake Safe for Swimming?
Green Lake in Isanti County, Minnesota has nutrient and algae measurements on record from state and federal monitoring. 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: 4.7 ft visibility. Phosphorus: 48 µg/L. Chlorophyll-a (algae): 16.4 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Water Clarity (Secchi Depth) | 4.7 ft |
| Phosphorus | 48 μg/L |
| Chlorophyll-a (Algae) | 16.4 μg/L |
| Maximum Depth | 28 ft |
| Location | Isanti County, Minnesota |
How does Green Lake compare?
On nutrient and algae readings, Green Lake runs above the Minnesota state average. It ranks #12 of 17 lakes in Isanti County on nutrient and algae readings.
Water clarity (Secchi depth) sits at 4.7 feet. That falls into moderate clarity — typical for lakes with some nutrient enrichment. Algae levels (chlorophyll-a) measure 16.4 µg/L — moderate; acceptable for swimming on most days, but worth checking advisories.
Stays via Stay22
Where to stay near Green Lake
Compare cabins, hotels, and vacation rentals near Green Lake in Isanti 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 Green 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 Green Lake?
Get lake water-quality updates plus the best cabin & lodging deals near Green Lake — straight to your inbox. No spam, unsubscribe anytime.
Watch Green Lake water quality
Get an email when the clarity or algae readings change. Unsubscribe anytime.