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 LakeGrade rubric score — the grade measures the water itself, not the species inhabiting it. But invasive presence is a meaningful adjacent signal worth reading alongside the grade.
Lakes with Flowering Rush
| Lake | County | State | Grade | Depth |
|---|---|---|---|---|
| Bass Lake | Otter Tail | MN | A | - |
| Unnamed Lake | Otter Tail | MN | A | 95 ft |
| Trout Lake | Itasca | MN | A | 135 ft |
| Pickerel Lake | Becker | MN | A | 74 ft |
| Round Lake | Sawyer | WI | A | 74 ft |
| Archibald Lake | Oconto | WI | A | 50 ft |
| Detroit Lake | Becker | MN | A | 89 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 | - |
| Silver Lake | Waushara | WI | A | 56 ft |
| Long Lake | Waushara | WI | A | 71 ft |
| Lake Emily | Portage | WI | A | 35 ft |
| Minocqua Lake | Oneida | WI | A | 60 ft |
| Minnetonka Lake | Hennepin | MN | B | 113 ft |
| Sallie Lake | Becker | MN | B | 50 ft |
| Spider Lake | Itasca | MN | B | 36 ft |
| Mill Lake | Becker | MN | B | 10 ft |
| North Twin Lake | Itasca | MN | B | 42 ft |
| South Twin Lake | Itasca | MN | B | 40 ft |
| Muskrat Lake | Becker | MN | B | 18 ft |
| Curfman Lake | Becker | MN | B | 24 ft |
| White River Flowage Lake | Waushara | WI | B | 20 ft |
| Mid Lake | Oneida | WI | B | 12 ft |
| Big Sandy Lake | Aitkin | MN | C | 84 ft |
| Stalker Lake | Otter Tail | MN | C | 95 ft |
| Forest Lake | Washington | MN | C | 37 ft |
| White Lake | Waupaca | WI | C | 10 ft |
| School Section Lake | Waupaca | WI | C | 38 ft |
| Tichigan Lake | Racine | WI | C | 63 ft |
| High Falls Reservoir at | Marinette | WI | C | 54 ft |
| Sauk Lake | Stearns | MN | C | 61 ft |
| Granite Lake | Wright | MN | C | 34 ft |
| Bald Eagle Lake | Ramsey | MN | C | 36 ft |
| Amelia Lake | Anoka | MN | C | - |
| Robinson Lake | Wabasha | MN | D | - |
| Machickanee Flowage Lake | Oconto | WI | D | 21 ft |
| Mallard Lake | Milwaukee | WI | D | 10 ft |
| Cannon Lake | Rice | MN | D | 15 ft |
| Pigeon Lake | Waupaca | WI | D | 10 ft |
| Horseshoe Lake | Rice | MN | F | 26 ft |
| Tetonka Lake | Le Sueur | MN | F | 35 ft |
| Spring Lake | Dakota | MN | F | 17 ft |
| Nelson Lake | Goodhue | MN | F | - |
| Wells Lake | Rice | MN | F | 4 ft |
| Upper Sakatah Lake | Le Sueur | MN | F | 12 ft |
| Byllesby Lake | Dakota | MN | F | 50 ft |
| Grey Cloud Slough Lake | Washington | MN | F | - |
| Lake | Columbia | WI | F | 24 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
Co-occurs in 21 lakes · 688 total
Co-occurs in 20 lakes · 432 total
Co-occurs in 16 lakes · 278 total
Co-occurs in 13 lakes · 688 total
Co-occurs in 12 lakes · 859 total
Co-occurs in 11 lakes · 363 total
Source: EPA National Aquatic Resource Surveys, 2026.