Flowering Rush

Invasive SpeciesFound in 57 lakes

Flowering Rush appears on state infested-waters lists for 57 surface waters. Boaters and anglers moving gear in or out of those lakes carry a clean-drain-dry obligation under state law. With 57 documented lakes, Flowering Rush sits in the middle of the invasion curve — established enough that prevention requires real coordination, not so widespread that containment is hopeless.

The presence of Flowering Rush does not directly change a lake's letter grade — the grade measures the water itself, not the species living in it. Invasive presence is still worth reading alongside the grade.

Total Lakes

Minnesota

Wisconsin

Lakes with Flowering Rush

Lake	County	State	Grade	Depth
Detroit Lake	Becker	MN	A	89 ft
Sallie Lake	Becker	MN	A	50 ft
Bass Lake	Otter Tail	MN	A	-
Pickerel Lake	Becker	MN	A	74 ft
Mill Lake	Becker	MN	A	10 ft
Glawe Lake	Becker	MN	A	24 ft
Melissa Lake	Becker	MN	A	37 ft
Little Pelican Lake	Otter Tail	MN	A	25 ft
Leek Lake	Otter Tail	MN	A	-
Curfman Lake	Becker	MN	A	24 ft
Round Lake	Sawyer	WI	A	74 ft
Stalker Lake	Otter Tail	MN	B	95 ft
Silver Lake	Waushara	WI	B	56 ft
Long Lake	Waushara	WI	B	71 ft
Archibald Lake	Oconto	WI	B	50 ft
Lake Emily	Portage	WI	B	35 ft
White Lake	Waupaca	WI	B	10 ft
Mid Lake	Oneida	WI	B	12 ft
School Section Lake	Waupaca	WI	B	38 ft
White River Flowage Lake	Waushara	WI	B	20 ft
Tichigan Lake	Racine	WI	B	63 ft
Minocqua Lake	Oneida	WI	B	60 ft
Minnetonka Lake	Hennepin	MN	C	113 ft
Big Sandy Lake	Aitkin	MN	C	84 ft
Amelia Lake	Anoka	MN	C	-
Muskrat Lake	Becker	MN	C	18 ft
Machickanee Flowage Lake	Oconto	WI	C	21 ft
Sauk Lake	Stearns	MN	D	61 ft
Granite Lake	Wright	MN	D	34 ft
Bald Eagle Lake	Ramsey	MN	D	36 ft
Forest Lake	Washington	MN	D	37 ft
Lake	Columbia	WI	D	24 ft
Lake Koshkonong	Jefferson	WI	D	7 ft
Pigeon Lake	Waupaca	WI	D	10 ft
Tetonka Lake	Le Sueur	MN	F	35 ft
Wells Lake	Rice	MN	F	4 ft
Upper Sakatah Lake	Le Sueur	MN	F	12 ft
Byllesby Lake	Dakota	MN	F	50 ft
Cannon Lake	Rice	MN	F	15 ft
Horseshoe Lake	Rice	MN	NR	26 ft
Unnamed Lake	Otter Tail	MN	NR	95 ft
Trout Lake	Itasca	MN	NR	135 ft
Spider Lake	Itasca	MN	NR	36 ft
North Twin Lake	Itasca	MN	NR	42 ft
Spring Lake	Dakota	MN	NR	17 ft
Nelson Lake	Goodhue	MN	NR	-
South Twin Lake	Itasca	MN	NR	40 ft
Robinson Lake	Wabasha	MN	NR	-
Grey Cloud Slough Lake	Washington	MN	NR	-
Lake Winneconne	Winnebago	WI	NR	9 ft

Showing 50 of 57 infested lakes.

Frequently Asked Questions

How many lakes have flowering rush?

Flowering Rush has been documented in 57 graded lakes: 34 in Minnesota, 23 in Wisconsin.

Does flowering rush affect water quality?

Invasive species can significantly affect lake ecosystems. They may alter nutrient cycling, displace native species, and change water clarity. Lakes with flowering rush should be monitored for changes in water quality over time.

Invasives Found With Flowering Rush

Zebra Mussel

Co-occurs in 21 lakes · 667 total

Curly-Leaf Pondweed

Co-occurs in 20 lakes · 420 total

Purple Loosestrife

Co-occurs in 16 lakes · 275 total

Zebra Mussel

Co-occurs in 13 lakes · 667 total

Eurasian Watermilfoil

Co-occurs in 12 lakes · 849 total

Banded Mystery Snail

Co-occurs in 11 lakes · 362 total

More on invasive species and lake health

Zebra Mussel Spread: How Many Lakes Are Affected?

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

Lake Water Quality Grades Explained: What A–F Means

How lakes are graded A–F on nutrients and algae using EPA ecoregion condition classes, what each letter means in the water, and why an A 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.