Fire Now Largest in New Mexico's History Has burned 265 square miles in Gila National Forest By Newser Editors and Wire Services Posted May 30, 2012 11:26 AM CDT 6 comments Comments This Tuesday, May 22, 2012, photo, provided by David Thornburg shows a plume of smoke rising from the Whitewater fire burning in the Gila Wilderness east of Glenwood, N.M. (David Thornburg) (Newser) – A massive wildfire that has burned more than 265 square miles in the Gila National Forest has become the largest fire in New Mexico state history, fire officials confirmed today. The erratic blaze grew overnight to more than 170,000 acres, surpassing a blaze last year that burned 156,593 acres in Los Conchas and threatened the Los Alamos National Laboratory, the nation's premier nuclear facility. The Gila forest fire is also the largest currently burning in the country. It formed last week when two lightning-sparked blazes merged in an isolated mountainous area in southwestern New Mexico, where it has destroyed about a dozen homes and prompted evacuations of nearby towns and health alerts for some of the state's largest cities. About 1,200 firefighters from around the state are battling the growing blaze, but they continue to face low humidity and shifting winds in their efforts.