Great Idaho, 1910
Credit: Library of Congress

The Place: Idaho and Montana
The Underlying Cause: Several small fires converged
The Devastation: 3,000,000 acres burned and 85 lives lost.
What Is Noteworthy about This Fire: This fire was helped along by hot, dry conditions and hurricane force winds. It was also being fought with a new, underfunded, and underprepared U.S. Forest Service, which had only been established five years prior.