The Cram Fire reached 77,158 acres as of July 17, remaining the state's largest blaze and growing nearly 13,000 acres since July 16.

Hot, dry conditions and strong winds have made it difficult to contain the Cram fire, the largest active wildfire in the state.

Gusty, shifting winds and high temperatures have caused a wildfire in central Oregon to spread rapidly, reaching more than 40,000 acres and prompting evacuations from ranches and communities in two counties, the authorities said on Tuesday.