Beach · Lake County · MN
Is Tettegouche State Park / Crystal Bay Beach safe to swim?
No advisory or algae bloom reported for this water today.
Updated July 19, 2026 · Minnesota beach program (EPA BEACON)
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Know before you get in at Tettegouche State Park / Crystal Bay Beach.
Get an alert the day a bacteria or algae advisory goes up.
What's in the water at Tettegouche State Park / Crystal Bay Beach right now
As of July 19, 2026, Tettegouche State Park / Crystal Bay Beach in Lake County, Minnesota is clear to swim. Blue-green algae are not currently monitored at this water. No fecal-bacteria advisory is posted (state beach program). Rainfall over the past week totaled 0.0 in, which can wash bacteria and nutrients into the water.
Blue-green algae at Tettegouche State Park / Crystal Bay Beach
Tettegouche State Park / Crystal Bay Beach is a lake in Lake County, Minnesota. Blue-green algae are not currently monitored at this water.
Blue-green algae (cyanobacteria) blooms are most common from midsummer into early fall, when the water is warm, calm, and rich in nutrients from runoff. They can produce toxins that make people sick and can be rapidly fatal to dogs, so skip water that looks green, scummy, or like spilled paint, and keep children and pets out of it.
Frequently asked: swimming in Tettegouche State Park / Crystal Bay Beach
- Is it safe to swim in Tettegouche State Park / Crystal Bay Beach right now?
- Tettegouche State Park / Crystal Bay Beach is clear to swim today. Blue-green algae are not currently monitored at this water. Conditions can change quickly with wind, heat, and rain, so check the posted signs and look at the water before you get in.
- Does Tettegouche State Park / Crystal Bay Beach have blue-green algae (cyanobacteria)?
- Blue-green algae are not currently monitored at Tettegouche State Park / Crystal Bay Beach. Watch for green, blue-green, or paint-like scum and avoid the water if you see it.
- Can dogs swim in Tettegouche State Park / Crystal Bay Beach?
- No bloom is detected at Tettegouche State Park / Crystal Bay Beach today, but dogs are much more vulnerable to blue-green algae than people, and blooms can form within hours. Always keep dogs away from water that looks green, scummy, or discolored, and rinse them off after swimming.
- How many Minnesota lakes and beaches have swim advisories today?
- Today, 307 Minnesota waters are under a swim advisory and 34 more warrant caution, out of 1162 monitored waters SwimZone tracks in the state.
- How is Tettegouche State Park / Crystal Bay Beach's water quality measured?
- SwimZone builds this read from EPA CyAN satellite imagery for blue-green algae, official beach and fecal-bacteria advisories where a program monitors Tettegouche State Park / Crystal Bay Beach, and a recent-rainfall overlay, all refreshed daily. It was last updated July 19, 2026.