An illustration of bare soil during fall, winter and spring in Minnesota.

Video: How the 'big brown spot' pollutes the Mississippi River

The big brown spot is the predominant source of pollution to Minnesota's groundwater and river systems. And it's the biggest obstacle we face to achieving a clean, healthy Mississippi River.

Upcoming Events

Educators: Bring FMR to your students
This school year
In your classroom or outside
Plant native plant species at St. Paul Park's Riverside Park
Thursday, September 10, 2026 - 5:00pm to 7:00pm
Near the Mississippi River backwaters, St. Paul Park
Partner event: Longfellow River Gorge Festival
Sunday, September 13, 2026 - 12:00pm to 4:00pm
34th to 36th Streets & West River Parkway Minneapolis

See all Upcoming Events

Take Me to the River 

Celebrate the Mississippi River and choose your own adventure while supporting FMR at our reimagined fall fundraiser on Thursday, Sept. 24.

 

Claim your spot by Sept. 10.