Have you ever noticed how many lake homes have large rocks lining their shorelines?

Those layers of rocks, known as riprap, are often meant to fight erosion and keep soil from crumbling into the lake due to waves or high water. But rock riprap brings a whole raft of other problems with it.

Kirsti Marohn has been reporting extensively on the subject and joined Minnesota Now to share what she’s learned as a part of a check-in with MPR News reporters in Greater Minnesota.

Minnesota is armoring its shorelines with rocks, but lakes are paying a price