The U.S. Army Corps of Engineers is seeking comments on a permit application from the Bonneville Power Administration (BPA) to build a 500-kilolt (kV) lattice steel tower transmission line that would run from a new 500-kV substation near Castle Rock, Washington, to a new 500-kV substation near Troutdale, Oregon. The proposed transmission line corridor would be about 79.8 miles long, and up to 150 feet wide.