invasive grass

After a wildfire, rivers and streams can take years to recover. Native plants and wildlife are often crowded out by invasive species in the aftermath. But in Nevada’s Virgin River watershed, a collaboration between federal agencies and conservation groups is pointing to early signs of recovery.

The U.S. Forest Service is spending nearly $19 million to fight invasive species threatening the nation’s forests, including several in the Mountain West.

Researchers from a number of states, including Idaho, Colorado and Nevada, have found that grazing does not help get rid of cheatgrass, a highly...