Depending on the environmental conditions, and the relative effectiveness of a given firebreak, firebreaks often have to be backed up with other firefighting efforts. Even then, it is still sometimes possible for fire to spread across a seemingly impenetrable divide. During the worst part of the fire season in southern California, strong Santa Ana winds were observed to blow carpets of burning embers across eight-lane freeways. During the 1988 fires in Yellowstone National Park, hot embers managed to cross the Lewis Canyon, a natural canyon up to a mile wide and 600 feet (180 m) deep. In Australia, firebreaks are less effective against eucalyptus forest fires, since intense fires in tinder-dry eucalyptus forest spread through flying embers, which can be carried by the winds to trigger new blazes several kilometres away. In 2019, goats deployed to graze the nearby flammable vegetation and create a firebreak helped save the Ronald Reagan Presidential Library and Museum and Getty Museum from California wildfires.