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LakeQuality
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Flowering Rush

Invasive speciesRecorded in 54 lakes

Flowering Rush appears on state infested-waters lists for 54 surface waters. Boaters and anglers moving gear in or out of those lakes carry a clean-drain-dry obligation under state law. With 54 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 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.

54
Lakes with records
34
Minnesota
20
Wisconsin

Lakes with Flowering Rush

LakeCountyStateDepth
Detroit LakeBeckerMN89 ft
Sallie LakeBeckerMN50 ft
Bass LakeOtter TailMN-
Pickerel LakeBeckerMN74 ft
Mill LakeBeckerMN10 ft
Glawe LakeBeckerMN24 ft
Melissa LakeBeckerMN37 ft
Little Pelican LakeOtter TailMN25 ft
Leek LakeOtter TailMN-
Curfman LakeBeckerMN24 ft
Round LakeSawyerWI74 ft
Stalker LakeOtter TailMN95 ft
Silver LakeWausharaWI56 ft
Long LakeWausharaWI71 ft
Archibald LakeOcontoWI50 ft
Lake EmilyPortageWI35 ft
White LakeWaupacaWI10 ft
Mid LakeOneidaWI12 ft
School Section LakeWaupacaWI38 ft
White River Flowage LakeWausharaWI20 ft
Tichigan LakeRacineWI63 ft
Minocqua LakeOneidaWI60 ft
Minnetonka LakeHennepinMN113 ft
Big Sandy LakeAitkinMN84 ft
Amelia LakeAnokaMN-
Muskrat LakeBeckerMN18 ft
Machickanee Flowage LakeOcontoWI21 ft
Sauk LakeStearnsMN61 ft
Granite LakeWrightMN34 ft
Bald Eagle LakeRamseyMN36 ft
Forest LakeWashingtonMN37 ft
LakeColumbiaWI24 ft
Lake KoshkonongJeffersonWI7 ft
Pigeon LakeWaupacaWI10 ft
Tetonka LakeLe SueurMN35 ft
Wells LakeRiceMN4 ft
Upper Sakatah LakeLe SueurMN12 ft
Byllesby LakeDakotaMN50 ft
Cannon LakeRiceMN15 ft
Horseshoe LakeRiceMN26 ft
Unnamed LakeOtter TailMN95 ft
Trout LakeItascaMN135 ft
Spider LakeItascaMN36 ft
North Twin LakeItascaMN42 ft
Spring LakeDakotaMN17 ft
Nelson LakeGoodhueMN-
South Twin LakeItascaMN40 ft
Robinson LakeWabashaMN-
Grey Cloud Slough LakeWashingtonMN-
Lake WinneconneWinnebagoWI9 ft

Showing 50 of 54 lakes with a record.

Frequently Asked Questions

How many lakes have flowering rush?

Flowering Rush is recorded in 54 measured lakes: 34 in Minnesota, 20 in Wisconsin. 54 of them carry a state infested-waters listing or an established population.

Does flowering rush 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 flowering rush is worth reading alongside its clarity number rather than through it.

Invasives Found With Flowering Rush

Zebra Mussel

Co-occurs in 21 lakes · 609 total

Curly-Leaf Pondweed

Co-occurs in 17 lakes · 387 total

Purple Loosestrife

Co-occurs in 13 lakes · 242 total

Eurasian Watermilfoil

Co-occurs in 12 lakes · 792 total

Banded Mystery Snail

Co-occurs in 11 lakes · 341 total

Zebra Mussel

Co-occurs in 10 lakes · 609 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.