Why Plants = A Healthier, Happier Lake Winnebago

Of course, too many plants in the wrong spot can get in the way of boating or swimming. That’s where plant management comes in—it's okay to responsibly clear them out when needed, following the WDNR's guidelines. See the WDNR's website for more information, or contact your local WDNR Lake Biologist for more information.

The key is doing it thoughtfully, with the big picture in mind: a healthy lake, for all of us, for years to come.

Check out these resources to learn more about plant management. It's about finding the balance between lake health and lake enjoyment:

Aquatic Plant Rules & Info
2024 Plant Management Guide

Each fall and winter, Lake Winnebago is drawn down to make room for snowmelt and spring rain. Then, in spring, the water slowly rises again.

Here’s the magic part: when spring water levels stay lower for a while, plants have a better chance to grow. If levels rise too quickly or stay too high, plants struggle—and algae often take over instead.

Think of it this way: Spring levels = summer results.
More plants in May = clearer water in August.

What you see in the lake today? It’s shaped by the last 3–5 years of weather, water levels, and lake conditions.

Here’s a real example:

• From 2005 to 2009, we had drier years, great water clarity, and lower lake levels. By 2010, the lake had tons of healthy plant growth.

• From 2011 to 2015, rain was heavy, water stayed high, and plants dropped off. Even with good management, nature plays a big role.

The point is: it’s not about quick fixes—it’s about setting the lake up for long-term success.

Lake Winnebago naturally has high levels of nutrients like nitrogen and phosphorus. Add in decades of runoff from farms and neighborhoods, and you’ve got a system that supports lots of growth—for better or worse.

That’s why encouraging plant growth (in the right places, at the right times) is so important.

You don’t have to be a scientist to make a difference. Here’s how lake lovers like you can help:

• Use less fertilizer near the lake

• Keep plants or rocks along your shoreline instead of mowing to the edge

• Learn what plants are helpful and what ones aren’t

• Let your neighbors know why plants matter

• Stay curious—every bit of awareness adds up

We all want a lake we can be proud of.
Clearer water. Healthier fish. Safe, fun recreation. It all starts with understanding the simple things—like the power of plants and the timing of water levels.

Lake Winnebago has always brought people together. And by working with nature, instead of against it, we can keep it strong, beautiful, and full of life—for generations to come.