Sunnyside Marina
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Water Quality of the St. Croix River

Thursday, March 29, 2018

by St. Croix River Association

Fast Facts about the River

The St. Croix River is one of the cleanest rivers in the Midwest. However, water quality is a growing concern. Much of the land use in the upper St. Croix's watershed is agriculture, which can lead to phosphorous-filled runoff that increases unhealthy algal blooms. Another major concern for water quality is the increase in recreational use of the Lower St. Croix due to its proximity to the Twin Cities.


Ways to Protect the River

If you like to boat, make sure to protect the river in other ways. Always take your trash with you, recycle your recyclable materials, only use local firewood and remind your friends to be similarly conscientious.

The St. Croix River Association is dedicated to preventing the spread of aquatic invasive species as we protect, restore and celebrate the St. Croix River and its watershed.

 Learn more about our programs and ways you can get involved by visiting our website at


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