Yosemite’s giant sequoias: California wildfire threatens world’s largest trees

 July 11, 2022, NPR



A growing wildfire in California is threatening the largest grove of giant sequoias in Yosemite National Park, the BBC reports.

The Washburn Fire has doubled in size over the past 24 hours, and it is now estimated to have burned 1,591 acres.

Firefighters are working in difficult terrain to protect some of the largest and oldest redwood trees in the world.

Residents and campers near the fire have been evacuated, and thick smoke has worsened the region’s air quality and obscured the park’s scenic views.

The blaze, which started on 7 July, threatens at least 500 giant sequoias in the Mariposa Grove, including the famed Grizzly Giant which is thought to be around 3,000 years old.

For now, none of them have been destroyed by the fire.

The Yosemite fire and aviation management department said it was “proactively protecting” the grove by setting up a sprinkler system to increase humidity around the trees and by removing potential fuels from the site.

 

Yosemite wildfire threatens grove of iconic sequoia trees

Giant Sequoia trees are seen in a meadow in the at Sequoia National Park near Visalia, Calif. on Friday Sept. 11, 2015. Researchers are studying how California's drought is affecting the Giant Sequoias, some more than 3,000 years old and 90 metres tall, making them among the oldest and largest living things on Earth. (AP / Rich Pedroncelli)

Published Saturday, July 9, 2022 7:48PM EDT

The largest grove of giant sequoias in Yosemite National Park remained closed Saturday as firefighters battled a blaze that threatened the gathering of the iconic trees and forced hundreds of campers to evacuate.

The rest of the park in California remained open, though smoke that hung in the air obscured some of the most scenic vistas and views.

More than 500 mature sequoias were threatened in the Mariposa Grove but as of Saturday afternoon there were no reports of severe damage to any named trees, including the 3,000-year-old Grizzly Giant. Some of the massive trunks were wrapped in fire-resistant foil for protection as the blaze burned out of control.

The cause of the fire was under investigation.

Beyond the trees, the small community of Wawona, which is surrounded by park and a campground, was under threat, with people ordered to leave their homes and campsites on Friday night.

The fire was proving difficult to contain, with firefighters throwing “every tactic imaginable” at it, said Nancy Phillipe, a Yosemite fire information spokesperson. That included air drops of fire retardant as well as the planned use of bulldozers to create fire lines, a tactic that's rarely used in a wilderness setting like Yosemite, Phillipe said.

The bulldozers would primarily be used to put in fire lines to protect Wawona, she said. About 600 to 700 people who were staying at the Wawona campground in tents, cabins and an historic hotel were ordered to leave.

Though firefighters were facing hot and dry conditions, they didn't have to contend with intense winds on Saturday, said Jeffrey Barlow, senior meteorologist with the National Weather Service in Hanford. Given the relatively small size of the fire and minimal winds, smoke impacts were not expected to stretch far beyond the park, he said.

The giant sequoias, native in only about 70 groves spread along the western slope of California's Sierra Nevada range, were once considered impervious to flames but have become increasingly vulnerable as wildfires fueled by a buildup of undergrowth from a century of fire suppression and drought exacerbated by climate change have become more intense and destructive.

Lightning-sparked wildfires over the past two years have killed up to a fifth of the estimated 75,000 large sequoias, which are the biggest trees by volume.

There was no obvious natural spark for the fire that broke out Thursday next to the park's Washburn Trail, Phillipe said. Smoke was reported by visitors walking in the grove that reopened in 2018 after a $40 million renovation that took three years.

The fire had grown to about 1.1 square miles (2.8 square kilometers) by Saturday morning.

A fierce windstorm ripped through the grove a year-and-a-half ago and toppled 15 giant sequoias, along with countless other trees.

The downed trees, along with massive numbers of pines killed by bark beetles, provided ample fuel for the flames.

The park has used prescribed burns to clear brush around the sequoias, which helps protect them if flames spread farther into the grove.

Meanwhile, most evacuation orders were lifted Saturday in the Sierra foothills about 80 miles (128 kilometers) to the northwest of the Yosemite fire, where a fire broke out on July 4. The Electra Fire that began near Jackson was mostly contained, and only areas directly within the fire's perimeter remained under evacuation orders, according to the California Department of Forestry and Fire Protection.