Red Swamp Crayfish
Invasive SpeciesFound in 1 lakes
Red Swamp Crayfish is documented in 1 lakes across our dataset — 0 in Minnesota and 1 in Wisconsin. Each state's DNR maintains an official "infested waters" roster that triggers boat-launch decontamination protocols. 1 lakes — narrow enough that aggressive containment is still on the table. Most upper-Midwest invasives that established here did so quietly over a decade before anyone noticed, so a low number today is not a guarantee for tomorrow.
The presence of Red Swamp Crayfish 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 Red Swamp Crayfish
| Lake | County | State | Grade | Depth |
|---|---|---|---|---|
| Altoona Lake | Eau Claire | WI | D | 25 ft |
Frequently Asked Questions
How many lakes have red swamp crayfish?
Red Swamp Crayfish has been documented in 1 lakes, 0 in Minnesota and 1 in Wisconsin.
Does red swamp crayfish affect water quality?
Invasive species can significantly affect lake ecosystems. They may alter nutrient cycling, displace native species, and change water clarity. Lakes with red swamp crayfish should be monitored for changes in water quality over time.
Source: EPA National Aquatic Resource Surveys, 2026.