An environmental group took the first steps on July 18 to filing suit against the U.S. Forest Service for failing to live up to its promise to keep cattle away from streams in eastern Arizona.

Thirteen years ago 468,638 acres of Arizona’s northern forests turned to ash as a result of the Rodeo-Chediski fire, which was the largest and most destructive wildfire in Arizona history until 2011, when the Wallow fire scorched more than 500,000 acres in five weeks.