Beach · Marinette County · WI
Is Peshtigo Harbor Boat Launch Beach safe to swim?
Recent heavy rain may have spiked bacteria since the last clear sample.
Updated July 19, 2026 · Wisconsin beach program (EPA BEACON)
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What's in the water at Peshtigo Harbor Boat Launch Beach right now
As of July 19, 2026, Peshtigo Harbor Boat Launch Beach in Marinette County, Wisconsin carries a swim caution. 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 1.2 in, which can wash bacteria and nutrients into the water.
Blue-green algae at Peshtigo Harbor Boat Launch Beach
Peshtigo Harbor Boat Launch Beach is a lake in Marinette County, Wisconsin. 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 Peshtigo Harbor Boat Launch Beach
- Is it safe to swim in Peshtigo Harbor Boat Launch Beach right now?
- Peshtigo Harbor Boat Launch Beach carries a swim caution 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 Peshtigo Harbor Boat Launch Beach have blue-green algae (cyanobacteria)?
- Blue-green algae are not currently monitored at Peshtigo Harbor Boat Launch Beach. Watch for green, blue-green, or paint-like scum and avoid the water if you see it.
- Can dogs swim in Peshtigo Harbor Boat Launch Beach?
- No bloom is detected at Peshtigo Harbor Boat Launch 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 Wisconsin lakes and beaches have swim advisories today?
- Today, 91 Wisconsin waters are under a swim advisory and 11 more warrant caution, out of 564 monitored waters SwimZone tracks in the state.
- How is Peshtigo Harbor Boat Launch 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 Peshtigo Harbor Boat Launch Beach, and a recent-rainfall overlay, all refreshed daily. It was last updated July 19, 2026.