A wildfire on the California and Oregon border has now burned 30,500 acres and destroyed 72 structures and continued out of control Sunday.

Firefighters said they had the Klamathon Fire in northern Siskiyou County 25 percent contained and good humidity overnight helped slow its progress.

The blaze, however, continues to burn to the southeast and into the Klamath National Forest, fire officials said.

Bill Murphy, public information officer with Cal Fire, said much of the fire is burning in steep terrain, making access difficult for firefighters. Dry fuel in the timber remained a concern as well, he said.

Another 810 structures are threatened, including 600 homes in the rural areas of Hornbrook, Hilt and Colestin.