Lake Tahoe wildfire seemed controllable, then wasn't

Just last week, managers overseeing the fight against the massive wildfire scorching California's Lake Tahoe region thought they could have it contained by the start of this week.

Instead, the Caldor Fire crested the Sierra Nevada on Monday, forcing the unprecedented evacuation of all 22,000 residents of South Lake Tahoe and tens of thousands of tourists who would otherwise be winding down their summers by the alpine lake straddling the CaliforniaNevada state line.

That drastic move might never have been needed if authorities could have thrown more firefighters at the blaze when it was small. That didn't happen because the Dixie Fire was simultaneously raging across the mountain range 100 miles (161 kilometers) to the north, on the way to becoming the secondlargest wildfire in California history.

"I do think the Dixie and the way that it's burned and its magnitude did impact the early response to the Caldor," said Scott Stephens, a professor of wildland fire science at the University of California, Berkeley. "It really drew resources down so much that the Caldor got very few for the first couple days."

By the time Caldor approached Lake Tahoe two weeks later, there were 4,000 fire personnel, dozens of water-dropping aircraft and hundreds of fire engines and bulldozers.

But all that manpower and equipment were overmatched by tinder dry conditions, whipping downslope winds and an overgrown forest ripe to burn, a half-dozen fire experts said. And with resources already stretched across the West and internationally, they said the long-term situation will only worsen as exhausted firefighters battle bigger blazes that start earlier and last longer.

"Mother Nature is calling the cards on our hubris that we can conquer and control wildfires during these extreme conditions," said Timothy Ingalsbee, a former federal firefighter who now heads Oregon-based Firefighters United for Safety, Ethics and Ecology, which advocates for working with wildfires instead of reflexively putting them out.

The Caldor Fire ignited from an unknown cause on Aug. 14 in the steep wooded foothills east of California's capital city of Sacramento. In the first few days, about 240 firefighters were dispatched, compared to the 6,550 firefighters battling the Dixie Fire at the time.