Authorities plan to drop about 200 trees by helicopter into a stretch of the Brule River along the Michigan-Wisconsin border to help improve trout habitat.
The trees are being dropped Tuesday and Wednesday in the Scott Lake, Mich., area. The project mimics the falling of trees from near the riverbank that might have taken place if the area of Iron County hadn't been heavily logged more than 100 years ago.
The drop is part of the second year of a three-year project funded by a $70,000 grant from Milwaukee-based utility We Energies and $20,000 from the U.S. Forest Service.
Michigan and Wisconsin officials are among those involved.
Trout are expected to use the tree tops and roots for shelter. A helicopter drop protects fragile riverbanks.