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Prior Lake Spring Lake Watershed District


Effectively manage existing aquatic invasive species (AIS) that adversely affect the quality of the lakes in the District with public access and take measures to help prevent new AIS from entering these systems.


The district has made great strides in control and management of aquatic invasive species (AIS) such as curly-leaf pondweed and common carp. Further management was supported by residents and partners, as well as the prevention of new AIS entering lakes with public access which is the where the greatest threat to new AIS introductions occurs.

Use this guide to identify aquatic plants.

New AIS can reduce water quality

Overgrowth of invasive plants

Common Carp reduce water quality

Recreational & ecological hazards


Within the priority issues above, there are a total of 23 goals. While all of these goals are intended to be accomplished in this ten-year WRMP, there were four that were of highest priority. These include:

  • Develop and implement an Aquatic Invasive Species (AIS) Response and Prevention Plan in coordination with Scott County to help prevent new AIS from entering Tier 1 lakes (lakes with public access).
  • Effectively manage common carp in Tier 1 and Tier 2 lakes to 100 kg/ha or below.
  • Monitor curly-leaf pondweed growth on Tier 1 lakes and treat as needed to prevent adverse effects on water quality.
  • Implement new management techniques for zebra mussels as innovative cost-effective methods are developed.