SISTERS, OR -- U.S. Forest Service crews are marking trees along Highway 20, west of Sisters, starting Monday. Officials say they're in danger of falling and need to be removed. Planning for the tree removal project began a year ago. The most dangerous trees were brought down last fall. 

Thousands of trees were compromised by exposure to the herbicide Perspective, several years ago. ODOT officials say 2,100 trees will be removed within a 150-food wide path on both sides of the highway, to protect drivers. 

Most will be used as wood products; some will be cut and left in place to provide wildlife habitat. The project should be done by late May.

Photo: April 2018