Curly-Leaf Pondweed: 387 Lakes with Records

Curly-Leaf Pondweed appears on state infested-waters lists for 387 surface waters. Boaters and anglers moving gear in or out of those lakes carry a clean-drain-dry obligation under state law. At 387 infested lakes, Curly-Leaf Pondweed is past the "containable" stage in the upper Midwest — every public boat-launch on uninfested water should now assume incoming boaters may be carrying it.

The presence of Curly-Leaf Pondweed does not change a lake's clarity, phosphorus or algae readings, which measure the water itself, not the species living in it. Invasive presence is still worth reading alongside those numbers.

387

Lakes with records

387

Wisconsin

Lakes with Curly-Leaf Pondweed

Lake	County	State	Depth
Big Cedar Lake-North Site-Near West Bend	Washington	WI	105 ft
Green Lake	Green Lake	WI	236 ft
Lake Beulah	Walworth	WI	58 ft
Geneva Lake	Walworth	WI	135 ft
Powers Lake	Kenosha	WI	33 ft
Lac Courte Oreilles Lake	Sawyer	WI	90 ft
Whitefish Lake	Sawyer	WI	105 ft
Grindstone Lake	Sawyer	WI	60 ft
Wind Lake	Polk	WI	7 ft
Green Lake	Walworth	WI	57 ft
Green Lake	Washington	WI	37 ft
Potter Lake	Walworth	WI	26 ft
Lake St Croix	St. Croix	WI	60 ft
Spider Lake	Sawyer	WI	64 ft
Spider Lake	Vilas	WI	43 ft
Beaver Dam Lake	Barron	WI	106 ft
Silver Lake	Kenosha	WI	44 ft
Silver Lake	Waushara	WI	56 ft
Silver Lake	Waupaca	WI	17 ft
Silver Lake	Waushara	WI	50 ft
Round Lake	Shawano	WI	39 ft
Mirror Lake	Waupaca	WI	43 ft
Deep Lake	Adams	WI	49 ft
Beasley Lake	Waupaca	WI	47 ft
Little Friess Lake	Washington	WI	34 ft
Ashippun Lake	Waukesha	WI	35 ft
Kusel Lake	Waushara	WI	29 ft
Clear Lake	Rusk	WI	74 ft
Clear Lake	Polk	WI	26 ft
Rice Lake	Iron	WI	21 ft
Bone Lake	Polk	WI	43 ft
Marl Lake	Waushara	WI	35 ft
Ottawa Lake	Waukesha	WI	16 ft
Bear Lake	Barron	WI	87 ft
Long Lake	Waupaca	WI	76 ft
Long Lake	Fond du Lac	WI	47 ft
Long Lake	Shawano	WI	35 ft
Crooked Lake	Adams	WI	56 ft
Crooked Lake	Oconto	WI	37 ft
Wilke Lake	Manitowoc	WI	21 ft
Rush Lake	Winnebago	WI	5 ft
Lilly Lake	Kenosha	WI	22 ft
East Alaska Lake	Kewaunee	WI	50 ft
Rock Lake	Jefferson	WI	60 ft
Pike Lake	Washington	WI	45 ft
Pleasant Lake	Waushara	WI	24 ft
Pleasant Lake	Walworth	WI	29 ft
Lake Morris	Waushara	WI	40 ft
Red Cedar Lake	Barron	WI	53 ft
Pewaukee Lake	Waukesha	WI	45 ft

Showing 50 of 387 lakes with a record.

Frequently Asked Questions

How many lakes have curly-leaf pondweed?

Curly-Leaf Pondweed is recorded in 387 measured lakes: 387 in Wisconsin. 387 of them carry a state infested-waters listing or an established population.

Does curly-leaf pondweed affect water quality?

An established invasive population can change how a lake works — altering nutrient cycling, displacing native species, and shifting water clarity. Clarity is the one to watch: filter-feeders can make water read clearer on a Secchi disk without any drop in nutrient loading, so a lake with curly-leaf pondweed is worth reading alongside its clarity number rather than through it.

Invasives Found With Curly-Leaf Pondweed

Chinese Mystery Snail

Co-occurs in 201 lakes · 469 total

Banded Mystery Snail

Co-occurs in 166 lakes · 341 total

Purple Loosestrife

Co-occurs in 145 lakes · 242 total

Zebra Mussel

Co-occurs in 113 lakes · 609 total

Rusty Crayfish

Co-occurs in 90 lakes · 233 total

Starry Stonewort

Co-occurs in 28 lakes · 79 total

More on invasive species and lake health

Zebra Mussel Spread: How Many Lakes Are Affected?

Zebra mussel counts from the lakes LakeQuality tracks, the counties that show up most often, and the Clean, Drain, Dry rules that still matter.

Lake Water Quality Explained: What the Readings Mean

How nutrient and algae readings are read against EPA ecoregion condition classes, what each class means in the water, and why a clean reading is not a clearance.

What to Check Before Buying Lakefront Property

Before you buy lakefront, check the water: clarity trend, nutrient impairment, algae advisories, invasive species, and depth — a data-backed checklist.

Source: EPA National Aquatic Resource Surveys, 2026.